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STK525 ............................................................................................. hardware user guide
STK525 hardware user guide user guide 1 7608a?avr?04/06 section 1 introduction ........................................................................................... 1-3 1.1 overview ...................................................................................................1-3 1.2 STK525 starter kit features .....................................................................1-4 section 2 using the STK525................................................................................. 2-6 2.1 overview ...................................................................................................2-6 2.2 power supply ............................................................................................2-7 2.3 reset ....................................................................................................2-10 2.4 at90usbxxx avr microcontroller..........................................................2-11 2.5 serial links .............................................................................................2-11 2.6 on-board resources...............................................................................2-14 2.7 stk500 resources .................................................................................2-19 2.8 in-system programming .........................................................................2-20 2.10 test points ..............................................................................................2-23 2.11 configuration pads .................................................................................2-24 2.12 solder pads ............................................................................................2-25 section 3 troubleshooting guide ....................................................................... 3-26 section 4 technical specifications ..................................................................... 4-27 section 5 technical support............................................................................... 5-28 section 6 complete schematics ......................................................................... 6-29
STK525 hardware user guide 1-3 7608a?avr?04/06 section 1 introduction congratulation for acquiring the avr? STK525 starter kit. this kit is designed to give designers a quick start to develop code on the at90usbxxx and for prototyping and testing of new designs. 1.1 overview this document describes the STK525 dedicated to the at90usbxxx avr microcontroller. this board is designed to allow an easy evaluation of the product using demonstration software. to complement the evaluation and enable additional development capability, the STK525 can be plugged into the atmel stk500 starter kit board in order to use the at90usbxxx with advanced features such as variable vcc, variable vref, variable xtal, etc. and supports all avr development tools. to increase its demonstrative capabilities, this stand alone board has numerous on- board resources (usb, rs232, joystick, data-flash, microphone and temperature sensor). this user guide acts as a general getting started guide as well as a complete technical reference for advanced users.
introduction 1-4 STK525 hardware user guide 7608a?avr?04/06 figure 1-1 . STK525 board 1.2 STK525 starter kit features the STK525 provides the following features: at90usbxxx tqfp device (2.7v introduction STK525 hardware user guide 1-5 7608a?avr?04/06 on-board reset button, on-board hwb button for force bootloader section execution at reset. system clock: ? external clock from stk500 expand connectors ? 8 mhz crystal, numerous access points for test. notes: 1. the STK525 is supported by avr studio?, version 4.12sp2 or higher. for up-to-date information on this and other avr tool products, please consult our web site. the newest version of avr studio?, avr tools and this user guide can be found in the avr section of the atmel web site, http://www.atmel.com. 2. atmel flip?, in system programming version 3 or higher shall be used for device firmware upgrade. please consult atmel web site to retrieve the latest version of flip and the dfu bootloader hex file if needed.
STK525 hardware user guide 2-6 7608a?avr?04/06 section 2 using the STK525 this chapter describes the board and all its features. 2.1 overview figure 2-1 . STK525 overview usb miniab rs232 jtag isp external power joystick potentiometer reset crystal microphone stk500 expand0 stk500 expand1 data flash leds vcc src. setting tqfp64 socket pin1 c sensor vbus gen. setting bootloader activation
using the STK525 STK525 hardware user guide 2-7 7608a?avr?04/06 2.2 power supply the on-board power supply circuitry allows various power supply configurations. 2.2.1 power supply sources the power supply source can come from three different (3) and exclusive sources: usb connector, jack pwr connector (j6, see figure 2-2), stk500 usb powered: when used as a usb device bus powered application, the STK525 can be powered via the usb vbus power supply line. jack pwr connector: ? need of a male jack outlet, ? input supply from 9 up to 15v (1) dc, ? no specific polarization (2) is required. figure 2-2 . jack pwr connector (j6) figure 2-3 . male jack outlet and wires stk500 powered: (c.f. ?stk500 resources? on page 19 ). notes: 1. 15v is the maximum level limitation of an unidirectional transit diode. 2. there is a diode (bridge) voltage level between the negative output of the power supply and the STK525 ?gnd?. this could introduce some gap of voltage during measurement and instrumentation. 3. caution : do not mount more than one power supply source on STK525. + -
using the STK525 2-8 STK525 hardware user guide 7608a?avr?04/06 2.2.2 power supply setting table 2-1 . power supply (1) setting notes: 1. caution: the stk500 has its own ?on/off? switch vcc source jumper position vcc power supply value comments view vbus 5 vbus (4,7v to 5.0v) this is the default configuration. this should be used for a typical usb device ?bus powered? application. in this mode, the STK525 is powered directly from the usb bus, and no other external power supply is required. reg 5 5v this configuration can be used for a usb ?self powered? device application? or when operating has a usb host. to use this configuration an external power supply must be connected to j6 connector. reg 3.3 3.3v this configuration allows the STK525 to be used in a 3v range application. this configuration can be used with both device or host mode usb applications. to use this configuration an external power supply must be connected to j6 connector. stk depends on stk500 vtg setting this configuration allows the STK525 to be used with an stk500 board. in this mode, the STK525 power supply is generated and configured according to the ?vtg? parameter of the stk500 (1). vcc source reg 5 reg 3.3 vbus 5 stk vcc source reg 5 reg 3.3 vbus 5 stk vcc source reg 5 reg 3.3 vbus 5 stk vcc source reg 5 reg 3.3 vbus 5 stk
using the STK525 STK525 hardware user guide 2-9 7608a?avr?04/06 2.2.3 vbus generator setting when using the at90usbxxx microcontroller in usb host mode. the STK525 should provide a 5v power supply over the vbus pin of its usb mini ab connector. a couple of transistors on the STK525 allows the uvcon pin of the at90usbxxx to control the vbus generation (see figure 2-4). in this mode the STK525 is powered by external power supply source (j6 or stk500 expand0/1 connectors). jp7 allows to select the 5v source used by the vbus generator. figure 2-4 . vbus generator schematic table 2-2 . vbus generator setting m1 fdv304p/fai r33 100k vtg stk ext q2 bc847b - c34 4.7uf 2 1 3 jp7 v bus g e n r32 10k uvcon vbus ?vbus gen? jumper position STK525 power supply comments view ?ext? external power supply from j6 this is the default configuration. the vbus generator source is the on-board 5v regulator. ?stk? external power supply from expand0/1 (connected to a stk500) the vbus generator source is the stk500. note: the ?vtarget? setting of stk500 should be set to ?5v?. vbus gen ext stk vbus gen ext stk
using the STK525 2-10 STK525 hardware user guide 7608a?avr?04/06 2.2.4 ?power-on? led the power-on led is always lit when power is applied to STK525 regardless of power supply source and the regulation. figure 2-5 . ?vcc-on? led 2.3 reset although the at90usbxxx has its on-chip r eset circuitry (c.f. at90usbxxx datasheet, section ?system control and reset), the STK525 provides the at90usbxxx a reset signal which can come from 3 different sources: 2.3.1 power-on reset the on-board rc network acts as power-on reset. 2.3.2 reset push button by pressing the reset push button on the stk 525, a warm reset of the at90usbxxx is performed. figure 2-6 . reset push button (rst) implementation
using the STK525 STK525 hardware user guide 2-11 7608a?avr?04/06 2.3.3 stk500 reset (c.f. ?reset from stk500? on page 20 ) 2.4 at90usbxxx avr microcontroller 2.4.1 main clock xtal to use the usb interface of the at90usbxxx, the clock source should always be a crystal or external clock oscillator (the internal 8mhz rc oscillator cannot be used to operate with the usb interface). only the following crystal frequency allows proper usb operations: 2mhz, 4mhz, 6mhz, 8mhz, 12mhz, 16mhz. the STK525 comes with a default 8mhz crystal oscillator. when closing stkx1 and stkx2 switches, and STK525 is connected to an stk500, the STK525 can operate with the ?stk500 osc? frequency parameter. 2.4.2 analog power supply avcc by default, avcc is equivalent to vcc. ana ref by default, aref is an output of at90usbxxx. an external aref source can be chosen (c.f. ?stk500 resources? on page 19 ). 2.5 serial links 2.5.1 usb the STK525 is supplied with a standard usb mini a-b receptacle. the mini ab receptacle allows to connect both a mini a plug or a mini b plug connectors. figure 2-7 . usb mini a-b receptacle when connected to a mini b plug, the at90usbxxx operates as an ?usb device? (the id pin of the plug is unconnected) and when connected to a mini a plug, the at90usbxxx operates as a ?usb host? (the id pin of the plug is tied to ground).
using the STK525 2-12 STK525 hardware user guide 7608a?avr?04/06 2.5.2 rs-232c the at90usbxxx is a microcontroller with an on-chip usart peripheral (usart1). only the asynchronous mode is supported by the STK525. the STK525 is supplied with a rs-232 driver/receiver. one female db9 connector assumes the rs-232 connections. figure 2-8 . rs-232 db9 connector figure 2-9 . rs-232 db9 connections figure 2-10 . typical pc connection layout 1 rs-232 db9 front view pin 2 5 6 9 2 3 4 7 8 rs-txd pin 3 rs-rxd pin 4 pin 6 pin 5 gnd pin 7 rs-cts pin 8 rs-rts STK525 / rs-232 db9 pc / db9 serial port pin no (com1 or comx) function pin no function 2 txd (at90usbxxx) 5 gnd 2 3 rxd (pc) txd (pc) 3 rxd (at90usbxxx) 5 gnd 7 cts (at90usbxxx) 7 8 rts (pc) cts (pc) 8 rts ( at90usbxxx ) if hardware data flow control
using the STK525 STK525 hardware user guide 2-13 7608a?avr?04/06 the STK525 usart implementation allows an optional hardware flow control that can be enabled thanks to sp4, sp5, sp7, sp8 solder pads (see figure 2-11). figure 2-11 . usart schematic table 2-3 . uart settings note: 1. tx reference: STK525 source, rx reference: STK525 destination mode solder pads configuration db9 connection (1) software data flow control (default configuration) sp4: open sp5: open sp7: open sp8: open tx rx pin 2 pin 3 optional hardware flow control sp4: close sp5: close sp7: close sp8: close tx rx cts rts pin 2 pin 3 pin 7 pin 8 5 9 4 8 3 7 2 6 1 10 11 p1 sub-d9 female rs232 rs232 interface rs-ct s vcc ct s rt s . 11 . 12 . 10 . 9 . 8 . 7 . 13 . 14 . 15 . 16 c1+ 1 v+ 2 c1- 3 c2+ 4 c2- 5 v- 6 rs 232 ttl gnd vcc u3 max3232 rs232 b uffer c17 100nf c16 100nf c18 100nf c19 100nf rxd pd2 rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-rxd pd[7..0] sp4 sp5 pd1 pd0 pd3 txd sp7 sp8 rs-rt s
using the STK525 2-14 STK525 hardware user guide 7608a?avr?04/06 2.6 on-board resources 2.6.1 joystick the 4+1 way joystick offers an easy user interface implementation for a usb application (it can emulate mouse movements, keyboard inputs, etc.). pushing a push-button causes the corresponding signal to be pulled low, while releasing (not pressed) causes an h.z state on the signal. the user must enable internal pull-ups on the input pins, removing the need for an external pull-up resistors on the push-button. figure 2-12 . joystick schematic figure 2-13 . joystick implementation 2.6.2 leds the STK525 includes 4 green leds implemented on one line. they are connected to the high nibble of ?port d? of at90usbxxx (portd[4..7]). to light on a led, the corresponding port pin must drive to high level. to light off a led, the corresponding port pin must drive a low level. it is the opposite method used in stk500. select 5 lef t 7 up 3 right 6 down 4 com1 1 com2 2 sw3 tpa511g pe[7..0] pb[7..0] pb5 pb6 pb7 pe4 pe5 select 5 lef t 7 up 3 right 6 down 4 com1 1 com2 2 sw3 tpa511g pe[7..0] pb[7..0] pb5 pb6 pb7 pe4 pe5 select 5 lef t 7 up 3 right 6 down 4 com1 1 com2 2 sw3 tpa511g pe[7..0] pb[7..0] pb5 pb6 pb7 pe4 pe5
using the STK525 STK525 hardware user guide 2-15 7608a?avr?04/06 figure 2-14 . leds implementation schematic in-line grouped leds d2 topled lp m676 led 0 (green) d3 topled lp m676 led 1 (green) d4 topled lp m676 led 2 (green) d5 topled lp m676 led 3 (green) r12 1k r13 1k r14 1k r15 1k pd4 pd5 pd7 pd[7..0] pd6
using the STK525 2-16 STK525 hardware user guide 7608a?avr?04/06 2.6.3 temperature sensor the temperature sensor uses a thermistor (r 18), or temperature-sensitive resistor. this thermistor has a negative temperature coefficient (ntc), meaning the resistance goes up as temperature goes down. of all passive temperature measurement sensors, thermistors have the highest sensitivity (resistance change per degree of temperature change). thermistors do not have a linear temperature/resistance curve. the voltage over the ntc can be found using the a/d converter (connected to channel 0). see the at90usb xxx datasheet for how to use the adc. the thermistor value (r t ) is calculated with the following expression: where: r t = thermistor value ( ) at t temperature (kelvin) r h = second resistor of the bridge -100 k 10% at 25c v adc0 = voltage value on adc-0 input (v) v cc = board power supply the ntc thermistor used in STK525 has a resistance of 100 k 5% at 25c (t 0 ) and a beta-value of 4250 3%. by the use of the following equation, the temperature (t) can be calculated: where: r t = thermistor value ( ) at t temperature (kelvin) ? = 4250 3% r 0 = 100 k 5% at 25c t 0 = 298 k (273 k + 25k) the following cross table also can be used. it is based on the above equation. table 2-4 . thermistor values versus temperature temp. (c) r t (k ) temp. (c) r t (k ) temp. (c) r t (k ) temp. (c) r t (k ) -20 1263,757 10 212,958 40 50,486 70 15,396 -19 1182,881 11 201,989 41 48,350 71 14,851 -18 1107,756 12 191,657 42 46,316 72 14,329 -17 1037,934 13 181,920 43 44,380 73 13,828 -16 973,006 14 172,740 44 42,537 74 13,347 -15 912,596 15 164,083 45 40,781 75 12,885 -14 856,361 16 155,914 46 39,107 76 12,442 -13 803,984 17 148,205 47 37,513 77 12,017 -12 755,175 18 140,926 48 35,992 78 11,608 -11 709,669 19 134,051 49 34,542 79 11,215 -10 667,221 20 127,555 50 33,159 80 10,838 r t r h v adc 0 ? () v cc v adc 0 C () ? = t r t r 0 ------- ln ?? ?? t 0 ------ + ------------------------------- =
using the STK525 STK525 hardware user guide 2-17 7608a?avr?04/06 figure 2-15 . thermistor schematic 2.6.4 microphone the STK525 provides an electret microphone associated with its required preamplifier (see figure 2-16), the interface is connected to adc channel 2 of the at90usbxxx microcontroller. -9 627,604 21 121,414 51 31,840 81 10,476 -8 590,613 22 115,608 52 30,580 82 10,128 -7 556,056 23 110,116 53 29,378 83 9,793 -6 523,757 24 104,919 54 28,229 84 9,471 -5 493,555 25 100,000 55 27,133 85 9,161 -4 465,300 26 95,342 56 26,085 86 8,863 -3 438,854 27 90,930 57 25,084 87 8,576 -2 414,089 28 86,750 58 24,126 88 8,300 -1 390,890 29 82,787 59 23,211 89 8,035 0 369,145 30 79,030 60 22,336 90 7,779 1 348,757 31 75,466 61 21,498 91 7,533 2 329,630 32 72,085 62 20,697 92 7,296 3 311,680 33 68,876 63 19,930 93 7,067 4 294,826 34 65,830 64 19,196 94 6,847 5 278,995 35 62,937 65 18,493 95 6,635 6 264,119 36 60,188 66 17,820 96 6,430 7 250,134 37 57,576 67 17,174 97 6,233 8 236,981 38 55,093 68 16,556 98 6,043 9 224,606 39 52,732 69 15,964 99 5,860 temp. (c) r t (k ) temp. (c) r t (k ) temp. (c) r t (k ) temp. (c) r t (k ) temperature sensor r18 cp1 r16 100k pf0 vcc
using the STK525 2-18 STK525 hardware user guide 7608a?avr?04/06 figure 2-16 . microphone interface schematic 2.6.5 data flash memory for mass-storage class demonstration purposes, the STK525 provides an on-chip serial flash memory (at45db321x) connected to the at90usbxxx serial port interface (spi). the data-flash chip select signal is connected to portb bit 4 of the at90usbxxx (see figure 2-17). figure 2-17 . on-board data flash schematic 2.6.6 potentiometer the cursor of a potentiometer is connect ed to adc channel 1 of the at90usbxxx. 3.3v 3.3v 3.3v r23 100k 1 tp4 mic 5 6 7 8 4 + - u4b lmv358 3 2 1 8 4 + - u4a lmv358 r27 0 r26 22k r25 10k r24 100k + c25 1uf r21 100k r28 100k c22 220pf + c24 4.7uf r20 2.2k mic1 microphone r22 100k 3.3v busy 1 reset 2 wp 3 vcc 6 gnd 7 cs 11 sck 12 si 13 so 14 u2 at45db321c tsop28 c15 100nf pb[7..0] r11 100k pb4 3.3v pb1 r10 100k reset pb2 pb3
using the STK525 STK525 hardware user guide 2-19 7608a?avr?04/06 2.7 stk500 resources figure 2-18 . connecting STK525 to the stk500 board note: caution: do not mount an avr microcontroller on the stk500 board when STK525 is plugged on stk500. 2.7.1 supply voltage from stk500 the avr supply voltage coming from stk500 (vtg) can also be controlled from avr studio?. the supply voltage coming from stk500 is controlled by power supply circuitry of the STK525. refer to table 2-1 on page 8 to configure ?vcc source? jumper. 2.7.2 analog reference voltage from stk500 the avr analog reference voltage coming from stk500 (ref) can also be controlled from avr studio?. jp3 should be closed
using the STK525 2-20 STK525 hardware user guide 7608a?avr?04/06 2.7.3 exp.con 0 & exp.con 1 connectors figure 2-19 . exp.con 0 and exp.con 1 connectors 2.7.4 main clock from stk500 the avr clock frequency (external) coming from stk500 (xt1/xt2) can also be controlled from avr studio?. ?stkx1? and ?stkx2? jumpers should be closed 2.7.5 reset from stk500 the avr reset coming from stk 500 (nrst - exp.con 0) can also control the STK525. STK525 is protected against +12v reset pulse (parallel programing not allowed for at90usbxxx on STK525) coming from stk500. 2.8 in-system programming 2.8.1 programming with usb bootloader: dfu (device firmware upgrade) at90usbxxx part comes with a default factory pre-programmed usb bootloader located in the on-chip boot section of the at90usbxxx. this is the easiest and fastest way to reprogram the device directly over the usb interface. the ?flip? pc side application available for free on atmel website offers a flexible and user friendly interface to reprogram the application over the usb bus. exp. con 1 gnd gnd 1 2 n.c. ( auxi0 ) n.c. ( auxo0 ) 3 4 n.c. ( ct7 ) n.c. ( ct6 ) 5 6 n.c. ( ct5 ) n.c. ( ct4 ) 7 8 n.c. ( ct3 ) n.c. ( ct2 ) 9 10 n.c. ( ct1 ) n.c. ( bsel2 ) 11 12 n.c. ref 13 14 nrst pg2 15 16 pg1 pg0 17 18 gnd gnd 19 20 pc7 pc6 23 24 vtg vtg 21 22 pc5 pc4 25 26 pc3 pc2 27 28 pc1 pc0 29 30 pa7 pa 6 31 32 pa5 pa 4 33 34 pa3 pa 2 35 36 pa1 pa 0 37 38 gnd gnd 39 40 gnd gnd 1 2 n.c. ( auxi1 ) n.c. ( auxo1 ) 3 4 n.c. ( data7 ) n.c. ( data6 ) 5 6 n.c. ( data5 ) n.c. ( data4 ) 7 8 n.c. ( data3 ) n.c. ( data2 ) 9 10 n.c. ( data1 ) n.c. ( data0 ) 11 12 n.c. ( si ) n.c. ( so ) 13 14 n.c. ( sck ) n.c. ( cs ) 15 16 xt1 xt2 17 18 vtg vtg 19 20 pb7 pb6 23 24 gnd gnd 21 22 pb5 pb4 25 26 pb3 pb2 27 28 pb1 pb0 29 30 pd7 pd6 31 32 pd5 pd4 33 34 pd3 pd2 35 36 pd1 pd0 37 38 gnd gnd 39 40 exp. con 0 top view
using the STK525 STK525 hardware user guide 2-21 7608a?avr?04/06 the hwb pin of the at90usbxxx allows to force the bootloader section execution after reset. (refer to at90usbxxx datasheet section ?boot loader support?). to force bootloader execution, operate as follows: press both ?rst? and ?hwb? push buttons first release the ?rst? push button release the ?hwb? push button for more information about the usb bootloader and flip software, please refer to the ?usb bootloader datasheet? document and ?flip user manual?. 2.8.2 programming with avr isp mkii programmer the at90usbxxx can be programmed using specific spi serial links. this sub section will explain how to connect the programmer. the flash, eeprom and all fuses and lock bits options isp-programmable can be programmed individually or with the sequential automatic programming option. the avr isp mkii programmer is a compact and easy-to-use in-system programming tool for developing applications with at90usbxxx. due to the small size, it is also an excellent tool for field upgrades of existing applications. the avr isp programming interface is integrated in avr studio?. to program the device using avr isp programmer, connect the 6-wire cable on the isp connector of the STK525 as shown in figure 2-20. note: see avr studio? on-line help for information. figure 2-20 . programming from avr isp mkii programmer 2.8.3 programming with stk500 the at90usbxxx can be programmed using the serial programming mode in the avr studio stk500 software. the software interface (in-system programming of an external target system) is integrated in avr studio?.
using the STK525 2-22 STK525 hardware user guide 7608a?avr?04/06 to program the device using isp from stk500, connect the 6-wire cable between the isp6pin connector of the stk500 board and the isp connector of the STK525 as shown in figure 2-18. note: see avr studio? on-line help for information. note: the high voltage parallel programming mode with stk500 is not available for an STK525. to reprogram an at90usbxxx part in parallel mode, use an stk501 extension board (at90usbxxx product pinout is compatible with the stk501 parallel programing mode). 2.8.4 programming with avr jtag ice the at90usbxxx can be programmed using specific jtag link. this sub-section will explain how to connect and use the avr jtag ice. note: when the jtagen fuse is unprogrammed, the four tap pins are normal port pins, and the tap controller is in reset. when programmed, the input tap signals are internally pulled high and the jtag is enabled for boundary-scan and programming. the at90usbxxx device is shipped with this fuse programmed. figure 2-21 . connecting avr jtag ice to STK525 the flash, eeprom and all fuse and lock bit options isp-programmable can be programmed individually or with the sequential automatic programming option. note: see avr studio? on-line help for information.
using the STK525 STK525 hardware user guide 2-23 7608a?avr?04/06 2.9 debugging 2.9.1 debugging with avr jtag ice mkii every STK525 can be used for debugging with jtag ice mk ii. connect the jtag ice mkii as shown in figure 2-21, for debugging help, please refer to avr studio? help information. when using jtag ice mk ii for debugging, and as at90usbxxx parts are factory configured with the higher security level set, a chip erase operation will be performed on the part before debugging. thus the on-chip flash bootloader will be erased. it can be restored after the debug session using the bootloader hex file available from atmel website. 2.10 test points there are 8 test points implemented, these test points are referred in the full schematics section. config. pads reference related signals function t1 d+ usb d+ data line t2 d- usb d- data line t3 aref analog reference t4 mic microphone preamplifier output t5 3.3v 3.3v internal power supply t6 5v 5v internal power supply t7 gnd ground t8 vbus usb vbus power supply
using the STK525 2-24 STK525 hardware user guide 7608a?avr?04/06 2.11 configuration pads configuration pads are used to disconnect/connect on-board peripherals or elements, their default configuration is: connect . 2.11.1 configuration pads listing table 2-5 . configuration pads 2.11.2 configuration pads - disconnection figure 1. configuration pad - disconnection 2.11.3 configuration pads - connection figure 2. configuration pad - re-connection config. pads reference related signals function cp1 c sensor (pf0) this configuration pad is used to disconnect/connect the ctn sensor from STK525. cp2 pot. (pf1) this configuration pad is used to disconnect/connect the potentiometer from STK525. cp3 mic.(pf2) this configuration pad is used to disconnect/connect the microphone preamplifier output from STK525. cut connection wire droplet of solder
using the STK525 STK525 hardware user guide 2-25 7608a?avr?04/06 2.12 solder pads solder pads are used to disconnect/connect on-board peripherals or elements, their default configuration is: disconnect . 2.12.1 solder pads listing table 2-6 . solder pads solder. pads reference related signals function sp1 avcc/vcc this solder pad can be used to bypass l1. sp2 nrst/reset this solder pad can be used to bypass d1. sp3 3.3v this solder pad is reserved to connect 3.3v power supply to the n.c pin of expand0/1 sp4 pd1/cts this solder pad allows to enable the logical cts signal for hardware control flow on rs232 interface. sp5 pd0/rts this solder pad allows to enable the logical rts signal for hardware control flow on rs232 interface. sp6 vbus this solder pad allows to bypass u5 vbus current limiter. sp7 rs-cts this solder pad allows to enable the physical cts signal for hardware control flow on rs232 interface. sp8 rs-rts this solder pad allows to enable the physical rts signal for hardware control flow on rs232 interface.
STK525 hardware user guide 3-26 7608a?avr?04/06 section 3 troubleshooting guide figure 3-1 . troubleshooting guide problem reason solution the green ?vcc-on? led is not on no power supply verify the power supply source verify the power supply source STK525 does not work connect the dc power supply source, or usb interface or stk500. the at90usbxxx cannot be programmed the stk500 isp header is not connected. connect a 6-pin flexible cable from stk500 isp 6-pin header to the correct STK525 isp header (page 21) the avr isp probe is not connected connect the avr isp 6-pin header to the correct STK525 isp header (page 21) the avr jtag ice probe is not connected connect the jtag ice 10-pin header to the correct STK525 jtag header (page 22) the memory lock bits are programmed erase the memory before programming the fuse bits are wrongly programmed check the fuse bits programming too fast with isp spi check oscillator settings and make sure it is not set higher than spi clock avr studio does not detect the avr tool used serial/usb cable is not connected, or power is off connect serial cable to rs232 (stk500 - avr isp) and check power connections connect serial cable to usb (jatg ice mkii, avr ispmkiil) and check power connections pc com port is in use disable other programs that are using pc com port. change pc com port avr studio does not detect com port. disable com port auto-detection in avr studio file menu. force com port to correct com port
troubleshooting guide STK525 hardware user guide 3-27 7608a?avr?04/06
STK525 hardware user guide 4-28 7608a?avr?04/06 section 4 technical specifications system unit ? physical dimensions................................................. l=119 x w=56 x h=27 mm ? weight...........................................................................................................70 g operating conditions ? internal voltage supply .......... ...........................................................2.7v - 5.5v ? external voltage supply ..........................................................9v -15v (100ma) connections ? usb connector ......................................................................mini ab receptacle ? usb communications .......................................................full speed/low speed ? rs 232c connector .............................................................9-pin d-sub female ? rs 232c communications maximum speed........................................ 250 kbps
STK525 hardware user guide 5-29 7608a?avr?04/06 section 5 technical support for technical support, please contact avr@atmel.com. when requesting technical support, please include the following information: which target avr device is used (complete part number) target voltage and speed clock source and fuse setting of the avr programming method (isp, jtag or specific boot-loader) hardware revisions of the avr tools, found on the pcb version number of avr studio. this can be found in the avr studio help menu. pc operating system and version/build pc processor type and speed a detailed description of the problem
STK525 hardware user guide 6-30 7608a?avr?04/06 section 6 complete schematics on the next pages, the following documents of STK525 revision 4381a are shown: complete schematics, assembly drawing, bill of materials. default configuration summary
complete schematics STK525 hardware user guide 6-31 7608a?avr?04/06 figure 6-1 . schematics, 1 of 5 c7 1uf vbus sw2 ext reset pe3 avcc pd[7..0] pd[7..0] nc k a d1 bat54/sot int 0/2 pa0 ucap capacitor closed to the mcu vcc pa1 r4 0 pf7 sp2 pa3 ugnd vcc pa[7..0] pa[7..0] pa[7..0] pa2 pe7 reset pa4 reset circuit force bootloader execution vcc r3 47k c8 220nf pe2 uvcon vbus important note: u1 is mounted through a tqfp64 zif socket pa5 pa6 c1 100nf ucap pa7 close solder pad to use parallel prog mode (12v on reset pin) sw1 hwb pe2 pf[7..0] pc7 ugnd r7 0 agnd r6 0 1 tp1 d+ d- d+ 1 tp2 d- 1 tp3 aref aref resistors closed to the device vcc pe4 pb[7..0] pb[7..0] pb[7..0] pe5 pc6 vcc avcc l1 b lm-21a 102s sp1 c2 100nf tit le size document number rev date: sheet of 11.0 cpu a4 14 wednesday , february 15, 2006 pc5 pc4 vcc pb0 vcc ferrite & capacitors closed to the mcu pb1 1-v_bus 3-d+ 2-d- 4-id 5-gnd shield shield shield shield usb_miniabf j1 pb2 pc3 r5 47k pe7 2 uvcc 3 d- 4 d+ 5 ugnd 6 ucap 7 vbus 8 pe3 9 pb0 10 pb1 11 pb2 12 pb3 13 pb4 14 pb5 15 pb6 16 pb7 17 pd0 25 pd1 26 pd2 27 pd3 28 pd4 29 pd5 30 pd6 31 pd7 32 pe4 18 pe5 19 aref 62 reset 20 gnd 53 gnd 63 gnd 22 xtal2 23 xtal1 24 pe0 33 pe1 34 pe6 1 pe2 43 pc0 35 pc1 36 pc2 37 pc3 38 pc4 39 pc5 40 pc6 41 pc7 42 pa7 44 pa6 45 pa5 46 pa4 47 pa3 48 pa2 49 pa1 50 pa0 51 pf7 54 pf6 55 pf5 56 pf4 57 pf3 58 pf2 59 pf1 60 pf0 61 vcc 52 vcc 21 avcc 64 at90usb128 u1 pb3 uvcon pe7 c5 100nf vcc decoupling capacitors closed to the device mcu pin3 vbus pc2 pb4 y1 8mhz c11 15pf c10 15pf pc1 pb5 vbus aref pc0 pb6 pe[7..0] pe1 pb7 pf0 pe0 STK525 mezzanine for stk500 c9 220nf ugnd ugnd ugnd ugnd ugnd pc[7..0] pc[7..0] c3 100nf pf1 r2 22 r1 22 reset d+ c4 100nf d- uid pe3 pf2 pd0 xtal2 pd1 pd2 pf3 pd3 agnd cr1 pgb0010603 pa[7..0] pa[7..0] pa[7..0] cr2 pgb0010603 pe0 pd4 xtal1 pd5 pd6 decoupling capacitors closed to the device mcu pin52 pe1 pd7 pf4 xtal2 ucap nrst uvcc d+ d- resistors closed to the mcu pe2 pf5 reset c6 100nf vcc pa[7..0] aref decoupling capacitors closed to the device mcu pin21 pf6 xtal1
complete schematics 6-32 STK525 hardware user guide 7608a?avr?04/06 figure 6-2 . schematics, 2 of 5 q1 bc847b c14 100nf c13 100nf pe0 pe2 pc6 pc4 pc5 pc2 pc0 pc1 pc3 pc7 pe1 r9 10k gnd 1 gnd 2 auxi0 3 auxo0 4 ct7 5 ct6 6 ct5 7 ct4 8 ct3 9 ct2 10 ct1 11 bsel2 12 (n.c.) 13 ref 14 nrst 15 pe2 16 pe1 17 pe0 18 gnd 19 gnd 20 vtg 21 vtg 22 pc7 23 pc6 24 pc5 25 pc4 26 pc3 27 pc2 28 pc1 29 pc0 30 pa7 31 pa6 32 pa5 33 pa4 34 pa3 35 pa2 36 pa1 37 pa0 38 gnd 39 gnd 40 con 2x20 j3 exp. con 0 xtal2 pd[7..0] gnd 1 gnd 2 auxi1 3 auxo1 4 data7 5 data6 6 data5 7 data4 8 data3 9 data0 10 data1 11 data9 12 si 13 so 14 sck 15 cs 16 xt1 17 xt2 18 vtg 19 vtg 20 gnd 21 gnd 22 pb7 23 pb6 24 pb5 25 pb4 26 pb3 27 pb2 28 pb1 29 pb0 30 pd7 31 pd6 32 pd5 33 pd4 34 pd3 35 pd2 36 pd1 37 pd0 38 gnd 39 gnd 40 con 2x20 j2 exp. con 1 tit le size document number rev date: sheet of 1.0 stk500 expand connectors a4 24 tuesday , january 17, 2006 stknc important: def ault conf iguration: open reserv ed f or f uture mass storage extension 3.3v sp3 STK525 mezzanine for stk500 nrst stknc vtg xtal1 pa0 r8 2k pb7 pb3 pb5 pd5 pd7 pb1 pb6 pd1 pd3 pb2 pb4 pd6 pb0 pd2 pd4 c12 1nf pd0 aref 1 2 jp3 stk aref vtg ref xt2 xt1 pe[2..0] vtg vtg pe[2..0] vtg pc[7..0] pc[7..0] pb[7..0] pd[7..0] pa[7..0] pa[7..0] pa5 pa7 pa6 pa1 pa3 pa4 1 2 jp1 stk x1 pa2 1 2 jp2 stk x2 pb[7..0]
complete schematics STK525 hardware user guide 6-33 7608a?avr?04/06 figure 6-3 . schematics, 3 of 5 data flash 3.3v leds 3.3v pf[7..0] decoupling capacitor close to the connector r19 pot 100k select 5 lef t 7 up 3 right 6 down 4 com1 1 com2 2 sw3 tpa511g pf[7..0] temp sensor pb[7..0] r18 ncp18wf104j03rb 5 9 4 8 3 7 2 6 1 10 11 p1 sub-d9 female rs232 1 2 3 4 j7 pf spare (not mounted) rs232 interface jtag interface rs-ct s 3.3v serial isp interface pe[7..0] cp1 vcc r16 100k STK525 mezzanine for stk500 vcc 3.3v busy 1 reset 2 wp 3 vcc 6 gnd 7 cs 11 sck 12 si 13 so 14 u2 at45db321c tsop28 microphone preamplifier interface pf0 vcc pb[7..0] ct s tit le size document number rev date: sheet of 1.0 interf aces a4 34 tuesday , january 17, 2006 c20 100nf rt s cp2 r23 100k . 11 . 12 . 10 . 9 . 8 . 7 . 13 . 14 . 15 . 16 c1+ 1 v+ 2 c1- 3 c2+ 4 c2- 5 v- 6 rs 232 ttl gnd vcc u3 max3232 rs232 b uffer c17 100nf c16 100nf c18 100nf pf1 c19 100nf rxd pd2 decoupling capacitor close to the device rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-t xd rs-rxd pd[7..0] vcc pf0 1 tp4 mic vcc decoupling capacitor close to the device c15 100nf pf1 sp4 pf2 sp5 vcc caution dataflash fix 3v power supply only pf3 pb[7..0] c26 100nf reset r11 100k cp3 decoupling capacitor close to the connector pb5 pdo 1 vcc 2 sck 3 pdi 4 reset 5 gnd 6 con 2x3 j5 isp con tc k 1 gnd 2 td o 3 vcc 4 tms 5 reset 6 vcc 7 n.c. 8 td i 9 gnd 10 con 2x5 j4 jtag con c21 100nf c23 100nf pd1 pf4 pf4 pf6 pf7 pf5 pf5 reset pb1 r17 0 pb2 pb3 3.3v pb6 pd0 vcc pd3 txd sp7 pb7 5 6 7 8 4 + - u4b lmv358 3 2 1 8 4 + - u4a lmv358 r27 0 r26 22k r25 10k r24 100k pb4 + c25 1uf r21 100k r28 100k c22 220pf + c24 4.7uf 3.3v r20 2.2k mic1 microphone r22 100k decoupling capacitor close to the device pe4 pb1 r10 100k pf2 in-line grouped leds reset d2 topled lp m676 led 0 (green) d3 topled lp m676 led 1 (green) d4 topled lp m676 led 2 (green) d5 topled lp m676 led 3 (green) pb2 r12 1k r13 1k pe5 r14 1k r15 1k pd4 pb3 pd5 pd7 pd[7..0] pd6 sp8 rs-rt s joystick interface
complete schematics 6-34 STK525 hardware user guide 7608a?avr?04/06 figure 6-4 . schematics, 4 of 5 - c30 4.7uf vtg in gnd out u8 lm340 vbus generator f or otg/host mode 1f STK525 mezzanine for stk500 stk ext ucap 3.3v q2 bc847b 3.3v d8 topled lp m676 power l ed( red) r34 1k tit le size document number rev date: sheet of 1.0 power a4 44 tuesday , january 17, 2006 5v c32 220nf 1 2 3 4 5 6 7 8 jp6 vcc source vcc - c34 4.7uf 2 1 3 jp7 v bus g e n d6 ll4148 r32 10k r35 100k 1% 3 1 4 2 -+ u7 df005s 3 2 1 j6 connector jack pwr ext power supply c33 100nf c29 33nf uvcon vbus out 1 in 2 gnd 3 out 4 fault 8 shdn 7 cc 6 set 5 u6 lp3982
complete schematics STK525 hardware user guide 6-35 7608a?avr?04/06 figure 6-5 . assembly drawing, 1 of 2 (component side) figure 6-6 . assembly drawing, 2 of 2 (solder side)
complete schematics 6-36 STK525 hardware user guide 7608a?avr?04/06 table 6-1 . bill of material item q.ty reference part tech. characteristics package 1 2 cr1,cr2 pgb0010603 esd protection case 0805 219 c1,c2,c3,c4,c5,c6,c13,c14,c15,c16,c 17,c18,c19,c20,c21,c23,c26,c27,c33 100nf 50v-10% ceramic case 0805 3 2 c7,c25 1uf 10vmin 10% eia/iecq 3216 4 3 c8,c9,c32 220nf 50v-10% ceramic case 0805 5 2 c10,c11 15pf 50v-5% ceramic case 0805 6 1 c12 1nf 50v-5% ceramic case 0805 7 1 c22 220pf 50v-5% ceramic case 0805 8 5 c24,c28,c30,c31,c34 4.7uf 10vmin 10% eia/iecq 3216 9 1 c29 33nf 50v-5% ceramic case 0805 10 3 cp1, cp2, cp3 configuration pad 11 1 d1 bat54/sot vf=0.3v sot23 12 5 d2,d3,d4,d5,d8 topled lp m676 green i=10 ma_ plcc-2 13 2 d6,d7 ll4148 i=200ma max ll-34 14 5 jp1,jp2,jp3,jp4,jp5 jumper 1x2 need 1 shunt 0,1" pitch 15 1 j1 usb_miniabf usb mini ab receptacle surface mount 16 2 j2,j3 con 2x20 17 1 j4 con 2x5 18 1 j5 con 2x3 19 1 j7 con 2x2 not mounted 20 1 jp6 jumper 2x4 need 1 shunt 0,1" pitch 21 1 j6 connector jack pwr int.diam=2.1mm pcb embase 22 1 jp7 jumper 3x1 23 1 l1 blm-21a102s ferrite bead 1 kohms at 100 mhz case 0805 24 1 mic1 microphone electret cap mic 25 1 m1 fdv304p/fai mosfet p sot23 26 1 p1 sub-d9 female 90 with harpoons 27 2 q1,q2 bc847b npn ic peak=200ma sot23 28 2 r1,r2 22 1/16w-5% smd case 0602 29 2 r3,r5 47k 1/16w-5% smd case 0603 30 5 r4,r6,r7,r17,r27 0 case 0603 31 1 r8 2k case 0604 32 4 r9,r25,r29,r32 10k 1/16w-5% smd case 0603
complete schematics STK525 hardware user guide 6-37 7608a?avr?04/06 6.0.1 default configuration - summary table 6-2 . default configuration summary 33 9 r10,r11,r16,r21,r22,r23,r24,r28,r33 100k 1/16w-5% smd case 0603 34 5 r12,r13,r14,r15,r34 1k 1/16w-5% smd case 0603 35 1 r18 ncp18wf104j03rb 100k - ?=4250 case 0603 36 1 r19 pot 100k pt10mh104me 37 1 r19 button pot button 38 1 r20 2.2k 1/16w-5% smd case 0603 39 1 r26 22k 1/16w-5% smd case 0603 40 1 r30, r35 100k 1% 1/16w-1% smd case 0603 41 1 r31 120k 1% 1/16w-1% smd case 0603 42 6 sp1,sp2,sp3,sp4,sp5,sp6 solderpad (na) (na) 43 2 sw1,sw2 push-button 6x3.5mm - 1.6n 44 1 sw3 tpa511g 4+1 ways joystick cms 45 8 tp1,tp2,tp3,tp4,tp5,tp6, tp7, tp8 test point diam.=1.32mm 46 1 u1 at90usbxxx tqfp64 47 1 u1 socket tqfp64 zif 48 1 u2 at45db321c tsop28 49 1 u3 max3232ecae+ ssop16 50 1 u4 lmv358 so8 51 1 u5 tps2041a soic8 52 1 u6 lp3982 low drop out vin max 6v, 300ma msop8 53 1 u7 df005s bridge rectifier see ds 54 1 u8 lm340 reg 5v cms sot223 55 1 y1 8mhz crystal h=4mm hc49/4h item q.ty reference part tech. characteristics package name ref. function state jumpers stkx1 jp1 xtal configuration off stkx2 jp2 xtal configuration off aref jp3 stk500 analog ref off vtg33 jp4 short 3.3v to vtg (mass storage extension board) off ucap jp5 short ucap with uvcc off vcc src jp6 vcc selection 3.4 shorted vbus gen jp7 vbus generation selection (host mode) 2.3 shorted solder pads
complete schematics 6-38 STK525 hardware user guide 7608a?avr?04/06 sp1 bypass l1 open sp2 open sp3 3.3v on expand 0 nc pin open sp4 cts open sp5 rts open sp6 bypass limiter open sp7 rs232 hardware control enable open sp8 rs232 hardware control enable open configuration pads cp1 bypass ctn in on pf0 close cp2 bypass potentiometer adc in on pf1 close cp3 bypass mic in on pf2 close name ref. function state
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