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1 ? x9401 low noise/low power/spi bus quad, 64 tap, digitally controlled potentiometer (xdcp?) features ? quad?4 separate pots, 64 taps/pot ? nonvolatile storage of wiper position ? four nonvolatile data registers for each pot ? 16-bytes of eeprom memory ? spi serial interface ?r total = 10k ? ? wiper resistance = 150 ? typical ? standby current < 1a (total package) ? operating current < 400a max. ?v cc = 2.7v to 5v ? packages?24 ld tssop and soic ? 100 year data retention ? pb-free plus anneal available (rohs compliant) description the x9401 integrates 4 digitally controlled potentiome- ters (xdcp) on a monolithic cmos integrated microcircuit. the digitally controlled potentiometer is implemented using 64 resistive elements in a series array. between each element are tap points connected to the wiper terminal through switches. the position of the wiper on the array is controlled by the user through the spi bus interface. each potentiometer has associated with it a volatile wiper counter register (wcr) and 4 nonvola- tile data registers (dr0:dr3) that can be directly writ- ten to and read by the user. the contents of the wcr controls the position of the wiper on the resistor array through the switches. power- up recalls the contents of dr0 to the wcr. the xdcp can be used as a three-terminal potentiom- eter or as a two-terminal variable resistor in a wide variety of applications in cluding control, parameter adjustments, and signal processing. block diagram interface and control circuitry cs sck so a0 a1 r0 r1 r2 r3 wiper counter register (wcr) resistor array pot 1 v h1 /r h1 v l1 /r l1 r0 r1 r2 r3 wiper counter register (wcr) v h0 /r h0 v l0 /r l0 data 8 v w0 /r w0 v w1 /r w1 r0 r1 r2 r3 resistor array v h2 /r h2 v l2 /r l2 v w2 /r w2 r0 r1 r2 r3 resistor array v h3 /r h3 v l3 /r l3 v w3 /r w3 wiper counter register (wcr) wiper counter register (wcr) pot 3 pot 2 hold pot 0 v cc v ss wp si caution: these devices are sensitive to electrosta tic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | intersil (and design) is a registered trademark of intersil americas inc. xdcp is a trademark of intersil americas inc. copy right intersil americas inc. 2005. all rights reserved all other trademarks mentioned are the property of their respective owners. preliminary data sheet fn8190.2 september 23, 2005
2 fn8190.2 september 23, 2005 ordering information part number part marking v cc limits (v) potentiometer organization (k ? ) temp range (c) package x9401ws24* x9401ws 5 10% 10 0 to 70 24 ld soic (300 mil) x9401ws24z* (note) x9401ws z 0 to 70 24 ld soic (300 mil) (pb-free) x9401ws24i* x9401ws i -40 to 85 24 ld soic (300 mil) x9401ws24iz* (note) x9401ws z i -40 to 85 24 ld soic (300 mil) (pb-free) x9401wv24* x9401wv 0 to 70 24 ld tssop (4.4mm) x9401wv24z* (note) x9401wv z 0 to 70 24 ld tssop (4.4mm) (pb-free) x9401wv24i* x9401wv i -40 to 85 24 ld tssop (4.4mm) x9401wv24iz* (note) x9401wv z i -40 to 85 24 ld tssop (4.4mm) (pb-free) x9401ws24-2.7* x9401ws f 2.7 to 5.5 0 to 70 24 ld soic (300 mil) x9401ws24z-2.7* (note) x9401ws z f 0 to 70 24 ld soic (300 mil) (pb-free) x9401ws24i-2.7* x9401ws g -40 to 85 24 ld soic (300 mil) x9401ws24iz-2.7* (note) x9401ws z g -40 to 85 24 ld soic (300 mil) (pb-free) x9401wv24-2.7* x9401wv f 0 to 70 24 ld tssop (4.4mm) x9401wv24z-2.7* (note) x9401wv z f 0 to 70 24 ld tssop (4.4mm) (pb-free) x9401wv24i-2.7* x9401wv g -40 to 85 24 ld tssop (4.4mm) x9401wv24iz-2.7* (note) x9401wv z g -40 to 85 24 ld tssop (4.4mm) (pb-free) x9401ys24i-2.7 x9401ys g 2.5 -40 to 85 24 ld soic (300 mil) x9401yv24i-2.7 x9401yv g -40 to 85 24 ld tssop (4.4mm) *add "t1" suffix for tape and reel. note: intersil pb-free plus anneal products employ special pb-free material sets; molding compounds/die attach materials and 100 % matte tin plate termination finish, which are rohs compliant and compatible with both snpb and pb-free soldering operations. intersil pb-free p roducts are msl classified at pb-free peak reflow temper atures that meet or exceed the pb-free requirements of ipc/jedec j std-020. x9401
3 fn8190.2 september 23, 2005 pin descriptions host interface pins serial output (so) so is a push/pull serial data output pin. during a read cycle, data is shifted out on this pin. data is clocked out by the falling edge of the serial clock. serial input si is the serial data input pin. all opcodes, byte addresses and data to be written to the pots and pot registers are input on this pin. data is latched by the rising edge of the serial clock. serial clock (sck) the sck input is used to clock data into and out of the x9401. chip select (cs ) when cs is high, the x9401 is deselected and the so pin is at high impedance, and (unless an internal write cycle is underway) the device will be in the standby state. cs low enables the x9401, placing it in the active power mode. it should be noted that after a power-up, a high to low transition on cs is required prior to the start of any operation. hold (hold ) hold is used in conjunction with the cs pin to select the device. once the part is selected and a serial sequence is underway, hold may be used to pause the serial communication with the controller without resetting the serial sequence. to pause, hold must be brought low while sck is low. to resume communication, hold is brought high, again while sck is low. if the pause feature is not used, hold should be held high at all times. device address (a 0 - a 1 ) the address inputs are used to set the least significant 2 bits of the 8-bit slave address. a match in the slave address serial data stream must be made with the address input in order to initia te communication with the x9401. a maximum of 4 dev ices may occupy the spi serial bus. potentiometer pins v h (v h0 - v h3 ), v l (v l0 - v l3 ), r h (r h0 - r h3 ), r l (r l0 - r l3 ) the v h /r h and v l /r l inputs are equivalent to the terminal connections on either end of a mechanical poten- tiometer. v w (v w0 - v w3 ), r w (r w0 - r w3 ) the wiper outputs are equivale nt to the wiper output of a mechanical potentiometer. hardware write protect input (wp ) the wp pin when low prevents nonvolatile writes to the wiper counter registers. pin configuration v cc v l0 /r l0 v h0 /r h0 wp si a 1 1 2 3 4 5 6 7 8 9 10 24 23 22 21 20 19 18 17 16 15 nc v l3 /r l3 v h3 /r h3 v w3 /r w3 a 0 so hold sck v l2 /r l2 v h2 /r h2 soic x9401 v ss v w0 /r w0 14 13 11 12 cs v l1 /r l1 v h1 /r h1 v w1 /r w1 v w2 /r w2 nc si a 1 v h2 /r h2 1 2 3 4 5 6 7 8 9 10 24 23 22 21 20 19 18 17 16 15 wp cs v w0 /r w0 v cc nc v l3 /r l3 v h3 /r h3 v w3 /r w3 tssop x9401 v w2 /r w2 14 13 11 12 hold v l1 /r l1 v h1 /r h1 v w1 /r w1 a 0 so v h0 /r h0 nc sck v l2 /r l2 v l0 /r l0 v ss x9401
4 fn8190.2 september 23, 2005 pin names device description the x9401 is a highly integr ated microcircuit incorpo- rating four resistor arrays and their associated regis- ters and counters and the serial interface logic providing direct communication between the host and the xdcp potentiometers. serial interface the x9401 supports the spi interface hardware con- ventions. the device is accessed via the si input with data clocked in on the rising sck. cs must be low and the hold and wp pins must be high during the entire operation. the so and si pins can be connected together, since they have three state outputs. this can help to reduce system pin count. array description the x9401 is comprised of four resistor arrays. each array contains 63 discrete resistive segments that are connected in series. the physical ends of each array are equivalent to the fixed terminals of a mechanical potentiometer (v h /r h and v l /r l inputs). at both ends of each array and between each resistor segment is a cmos switch connected to the wiper (v w /r w ) output. within each individual array only one switch may be turned on at a time. these switches are cont rolled by a wiper counter register (wcr). the six bits of the wcr are decoded to select, and enable, one of sixty-four switches. wiper counter register (wcr) the x9401 contains four wiper counter registers, one for each xdcp potentiometer. the wcr is equiv- alent to a serial-in, parallel-out register/counter with its outputs decoded to select one of sixty-four switches along its resistor array. th e contents of the wcr can be altered in four ways: it may be written directly by the host via the write wiper counter register instruc- tion (serial load); it may be written indirectly by trans- ferring the contents of one of four associated data registers via the xfr data register or global xfr data register instructions (parallel load); it can be modified one step at a time by the increment/decre- ment instruction. finally, it is loaded with the contents of its data register zero (r0) upon power-up. the wiper counter register is a volatile register; that is, its contents are lost when the x9401 is powered- down. although the register is automatically loaded with the value in r 0 upon power-up, this may be differ- ent from the value present at power-down. the wiper position must be stored in r 0 to insure restoring the wiper position after power-up. data registers each potentiometer has four 6-bit nonvolatile data reg- isters. these can be read or written directly by the host. data can also be transferred between any of the four data registers and the associated wiper counter register. all operations changing data in one of the data registers is a nonvolat ile operation and will take a maximum of 10ms. if the application does not require storage of multiple settings for the potentiometer, the data registers can be used as memory locations for system parameters or user preference data. data register detail symbol description sck serial clock si, so serial data a 0 - a 1 device address v h0 /r h0 - v h3 /r h3 , v l0 /r l0 - v l3 /r l3 potentiometers (terminal equivalent) v w0 /r w0 - v w1 /r w1 potentiometers (wiper equivalent) wp hardware write protection v cc system supply voltage v ss system ground nc no connection (msb) (lsb) d5 d4 d3 d2 d1 d0 nv nv nv nv nv nv x9401
5 fn8190.2 september 23, 2005 detailed potentiometer block diagram write in process the contents of the data registers are saved to non- volatile memory when the cs pin goes from low to high after a complete writ e sequence is received by the device. the progress of this internal write opera- tion can be monitored by a write in process bit (wip). the wip bit is read with a read status command. instructions identification (id) byte the first byte sent to the x9401 from the host, follow- ing a cs going high to low, is called the identifica- tion byte. the most significa nt four bits of the slave address are a device type identifier, for the x9401 this is fixed as 0101[b] (refer to figure 1). the two least significant bits in the id byte select one of four devices on the bus. the physical device address is defined by the state of the a 0 - a 1 input pins. the x9401 compares the serial data stream with the address input state; a successful compare of both address bits is required for the x9401 to successfully continue the command sequence. the a 0 - a 1 inputs can be actively driven by cmos input signals or tied to v cc or v ss . the remaining two bits in the slave byte must be set to 0. figure 1. identification byte format instruction byte the next byte sent to the x9401 contains the instruc- tion and register pointer information. the four most significant bits are the instruction. the next four bits point to one of the four pots and, when applicable, they point to one of four as sociated registers. the for- mat is shown below in figure 2. serial data path from interface circuitry register 0 register 1 register 2 register 3 serial bus input parallel bus input wiper counter register inc/dec logic up/dn clk modified scl up/dn v h /r h v l /r l v w /r w if wcr = 00[h] then v w /r w = v l /r l if wcr = 3f[h] then v w /r w = v h /r h 8 6 c o u n t e r d e c o d e (wcr) (one of four arrays) 1 00 0 0 a1 a0 device type identifier device address 1 x9401
6 fn8190.2 september 23, 2005 figure 2. instruction byte format the four high order bits of the instruction byte specify the operation. the next two bits (r 1 and r 0 ) select one of the four registers that is to be acted upon when a register oriented instruct ion is issued. the last two bits (p1 and p 0 ) selects which one of the four potenti- ometers is to be affected by the instruction. four of the ten instructions are two bytes in length and end with the transmission of the instruction byte. these instructions are: ? xfr data register to wiper counter register ?this transfers the contents of one specified data register to the associated wiper counter register. ? xfr wiper counter regi ster to data register ?this transfers the contents of the specified wiper counter register to the specified associated data register. ? global xfr data register to wiper counter register ?this transfers the contents of all specified data registers to the associated wiper counter regis- ters. ? global xfr wiper counter register to data register ?this transfers the contents of all wiper counter registers to the s pecified associated data registers. the basic sequence of the two by te instructions is illus- trated in figure 3. these two-byte instructions exchange data between the wcr and one of the data registers. a transfer from a data register to a wcr is essentially a write to a static ram, with the static ram controlling the wiper position. the response of the wiper to this action will be delayed by t wrl . a transfer from the wcr (current wiper positi on), to a data register is a write to nonvolatile memory and takes a minimum of t wr to complete. the transfer can occur between one of the four potentiometers and one of its associated reg- isters; or it may occur globally, where the transfer occurs between all potentiometers and one associated register. five instructions require a three-byte sequence to complete. these instructions transfer data between the host and the x9401; ei ther between the host and one of the data registers or directly between the host and the wiper counter register. these instructions are: ? read wiper counter register ? read the current wiper position of the selected pot, ? write wiper counter register ?change current wiper position of the selected pot, ? read data register ?read the contents of the selected data register; ? write data register ?write a new value to the selected data register. ? read status ?this command returns the contents of the wip bit which indica tes if the internal write cycle is in progress. the sequence of these operati ons is shown in figure 4 and figure 5. the final command is increment/decrement. it is dif- ferent from the other commands, because it?s length is indeterminate. once the command is issued, the mas- ter can clock the selected wiper up and/or down in one resistor segment steps; thereby, providing a fine tun- ing capability to the host. for each sck clock pulse (t high ) while si is high, the selected wiper will move one resistor segment towards the v h /r h terminal. similarly, for each sck clock pulse while si is low, the selected wiper will move one resistor segment towards the v l /r l terminal. a detailed illustration of the sequence and timing for this operation are shown in figure 6 and figure 7. i1 i2 i3 i0 r1 r0 p1 p0 pot select register select instructions x9401
7 fn8190.2 september 23, 2005 figure 3. two-byte command sequence figure 4. three-byte command sequence (write) figure 5. three-byte command sequence (read) figure 6. increment/decrement command sequence 010100a1a0 i3 i2 i1 i0 r1 r0 p1 p0 sck si cs 0 1 0 1 a1 a0 i3 i2 i1 i0 r1 r0 p1 p0 scl si 0 0 d5 d4 d3 d2 d1 d0 cs 00 0 1 0 1 a1 a0 i3 i2 i1 i0 r1 r0 p1 p0 scl si cs 00 s0 0 0 d5 d4 d3 d2 d1 d0 don?t care 010100a1a0 i3 i2 i1 i0 0 p1 p0 sck si i n c 1 i n c 2 i n c n d e c 1 d e c n 0 cs x9401
8 fn8190.2 september 23, 2005 figure 7. increment/decrement timing limits table 1. instruction set instruction instruction set operation i 3 i 2 i 1 i 0 r 1 r 0 p 1 p 0 read wiper counter register 1 0 0 1 0 0 p 1 p 0 read the contents of the wiper counter register pointed to by p 1 - p 0 write wiper counter register 1 0 1 0 0 0 p 1 p 0 write new value to the wiper counter register pointed to by p 1 - p 0 read data register 1 0 1 1 r 1 r 0 p 1 p 0 read the contents of the data register pointed to by p 1 - p 0 and r 1 - r 0 write data register 1 1 0 0 r 1 r 0 p 1 p 0 write new value to the data register pointed to by p 1 - p 0 and r 1 - r 0 xfr data register to wiper counter register 1101r 1 r 0 p 1 p 0 transfer the contents of the data register pointed to by r 1 - r 0 to the wiper counter register pointed to by p 1 - p 0 xfr wiper counter register to data register 1110r 1 r 0 p 1 p 0 transfer the contents of the wiper counter register pointed to by p 1 - p 0 to the register pointed to by r 1 - r 0 global xfr data register to wiper counter register 0001r 1 r 0 0 0 transfer the contents of the data registers pointed to by r 1 - r 0 of all four pots to their respective wiper counter register global xfr wiper counter register to data register 1000r 1 r 0 0 0 transfer the contents of all wiper counter registers to their respective data registers pointed to by r 1 - r 0 of all four pots increment/decrement wiper counter register 00100 0p 1 p 0 enable increment/decrement of the wiper c ounter register pointed to by p 1 - p 0 read status (wip bit) 0 1 0 1 0 0 0 1 read the status of the internal write cycle, by checking the wip bit. sck si v w /r w inc/dec cmd issued t wrid voltage out x9401
9 fn8190.2 september 23, 2005 instruction format notes: (1) ?a1 ~ a0?: stands for the device addresses sent by the master. (2) wpx refers to wiper position data in the counter register (3) ?i?: stands for the increment operation, si held high during active sck phase (high). (4) ?d?: stands for the decrement operation, si held low during active sck phase (high). read wiper counter register (wcr) write wiper counter register (wcr) read data register (dr) write data register (dr) transfer data register (dr) to wiper counter register (wcr) cs falling edge device type identifier device addresses instruction opcode wcr addresses wiper position (sent by x9401 on so) cs rising edge 010100 a 1 a 0 100100 p 1 p 0 00 w p 5 w p 4 w p 3 w p 2 w p 1 w p 0 cs falling edge device type identifier device addresses instruction opcode wcr addresses data byte (sent by host on si) cs rising edge 010100 a 1 a 0 101000 p 1 p 0 00 w p 5 w p 4 w p 3 w p 2 w p 1 w p 0 cs falling edge device type identifier device addresses instruction opcode dr and wcr addresses data byte (sent by x9401 on so) cs rising edge 010100 a 1 a 0 1011 r 1 r 0 p 1 p 0 00 w p 5 w p 4 w p 3 w p 2 w p 1 w p 0 cs falling edge device type identifier device addresses instruction opcode dr and wcr addresses data byte (sent by host on si) cs rising edge high-voltage write cycle 010100 a 1 a 0 1100 r 1 r 0 p 1 p 0 00 w p 5 w p 4 w p 3 w p 2 w p 1 w p 0 cs falling edge device type identifier device addresses instruction opcode dr and wcr addresses cs rising edge 010100 a 1 a 0 1101 r 1 r 0 p 1 p 0 x9401
10 fn8190.2 september 23, 2005 transfer wiper counter register (wcr) to data register (dr) increment/decrement wiper counter register (wcr) global transfer data register (dr) to wiper counter register (wcr) global transfer wiper counter register (wcr) to data register (dr) read status cs falling edge device type identifier device addresses instruction opcode dr and wcr addresses cs rising edge high-voltage write cycle 010100 a 1 a 0 1110 r 1 r 0 p 1 p 0 cs falling edge device type identifier device addresses instruction opcode wcr addresses increment/decrement (sent by master on sda) cs rising edge 010100 a 1 a 0 0010xx p 1 p 0 i/ d i/ d .... i/ d i/ d cs falling edge device type identifier device addresses instruction opcode dr addresses cs rising edge 010100 a 1 a 0 0001 r 1 r 0 00 cs falling edge device type identifier device addresses instruction opcode dr addresses cs rising edge high-voltage write cycle 010100 a 1 a 0 1000 r 1 r 0 00 cs falling edge device type identifier device addresses instruction opcode wiper addresses data byte (sent by x9401 on so) cs rising edge 010100 a 1 a 0 010100010000000 w i p x9401
11 fn8190.2 september 23, 2005 absolute maximum ratings temperature under bias .................... -65 c to +135 c storage temperature ......................... -65 c to +150 c voltage on sck, scl or any address input with respect to v ss ......................... -1v to +7v ? v = |(v h ?v l )|...................................................... 5.5v lead temperature (soldering, 10s) .................... 300 c comment stresses above those liste d under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only; the functional operation of the device (at these or any other conditions above those listed in the operational sections of this specifi- cation) is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. analog characteristics (over recommended operating condi tions unless otherwise stated.) power-up and down requirements the are no restrictions on the power-up or power-down conditions of v cc and the voltages applied to the poten- tiometer pins provided that v cc is always more positive than or equal to v h , v l , and v w , i.e., v cc v h , v l , v w . the v cc power-up spec is always in effect. notes: (1) absolute linearity is utilized to determ ine actual wiper voltage versus expected vo ltage as determined by wiper position whe n used as a potentiometer. (2) relative linearity is utilized to deter mine the actual change in voltage between two successive tap posit ions when used as a potentiom- eter. it is a measure of the error in step size. (3) mi = rtot/63 or (v h - v l )/63, single pot symbol parameter limits test condition min. typ. max. unit r total end to end resistance ?20 +20 % power rating 50 mw 25 c, each pot i w wiper current ?6 +6 ma r w wiper resistance 150 500 ? wiper current = 3ma v term voltage on any v h or v l pin v ss v cc vv ss = 0v noise -120 dbv ref: 1khz resolution 1.6 % absolute linearity (1) -1 +1 mi (3) v w(n)(actual) - v w(n)(expected) relative linearity (2) -0.2 +0.2 mi (3) v w(n + 1) - [v w(n) + mi ] temperature coefficient of r total 300 ppm/ c ratiometric temp. coefficient 20 ppm/c c h /c l /c w potentiometer capacitances 10/10/25 pf see macro model i al r h , r l , r w leakage current 0.1 10 a v in = v ss to v cc . device is in stand-by mode. recommended operating conditions temp min. max. commercial 0 c+70 c industrial -40 c+85 c device supply voltage (v cc ) limits x9401 5v 10% x9401-2.7 2.7v to 5.5v x9401
12 fn8190.2 september 23, 2005 d.c. operating characteristics (over the recommended operating cond itions unless otherwise specified.) endurance and data retention capacitance power-up timing a.c. test conditions notes: (4) this parameter is periodically sampled and not 100% tested (5) t pur and t puw are the delays required from the time the (last) power supply (v cc -) is stable until the specific instruction can be issued. these parameters are period- ically sampled and not 100% tested. (6) this is not a tested or guaranteed parameter and should be used only as a guideline. equivalent a.c. load circuit symbol parameter limits test conditions min. typ. max. unit i cc1 v cc supply current (active) 400 a f sck = 2mhz, so = open, other inputs = v ss i cc2 v cc supply current (nonvola- tile write) 1maf sck = 2mhz, so = open, other inputs = v ss i sb v cc current (standby) 1 a sck = si = v ss , addr. = v ss , cs = v cc i li input leakage current 10 a v in = v ss to v cc i lo output leakage current 10 a v out = v ss to v cc v ih input high voltage v cc x 0.7 v cc + 0.5 v v il input low voltage -0.5 v cc x 0.1 v v ol output low voltage 0.4 v i ol = 3ma parameter min. unit minimum endurance 100,000 data changes per bit per register data retention 100 years symbol test max. unit test condition c out (4) output capacitance (so) 8 pf v out = 0v c in (4) input capacitance (a0, a1, si, and sck) 6 pf v in = 0v symbol parameter min. max. unit t r v cc (6) v cc power-up rate 0.2 50 v/ms t pur (5) power-up to initiation of read operation 1 ms t puw (5) power-up to initiation of write operation 5 ms i nput pulse levels v cc x 0.1 to v cc x 0.9 input rise and fall times 10ns input and output timing level v cc x 0.5 5v 1533 ? 100pf sda output r h 10pf c l c l r w r total c w 25pf 10pf r l spice macro model x9401
13 fn8190.2 september 23, 2005 ac timing high-voltage wr ite cycle timing xdcp timing symbol parameter min. max. unit f sck ssi/spi clock frequency 2.0 mhz t cyc ssi/spi clock cycle rime 500 ns t wh ssi/spi clock high rime 200 ns t wl ssi/spi clock low time 200 ns t lead lead time 250 ns t lag lag time 250 ns t su si, sck, hold and cs input setup time 50 ns t h si, sck, hold and cs input hold time 50 ns t ri si, sck, hold and cs input rise time 2 s t fi si, sck, hold and cs input fall time 2 s t dis so output disable time 0 500 ns t v so output valid time 100 ns t ho so output hold time 0 ns t ro so output rise time 50 ns t fo so output fall time 50 ns t hold hold time 400 ns t hsu hold setup time 100 ns t hh hold hold time 100 ns t hz hold low to output in high z 100 ns t lz hold high to output in low z 100 ns t i noise suppression time constant at si, sck, hold and cs inputs 20 ns t cs cs deselect time 2 s t wpasu wp , a0 and a1 setup time 0 ns t wpah wp , a0 and a1 hold time 0 ns symbol parameter typ. max. unit t wr high-voltage write cycle time (store instructions) 5 10 ms symbol parameter min. max. unit t wrpo wiper response time after the third (last) power supply is stable 10 s t wrl wiper response time after instruction issued (all load instructions) 10 s t wrid wiper response time from an active scl/sck edge (increment/decrement instruction) 450 ns x9401
14 fn8190.2 september 23, 2005 symbol table timing diagrams input timing output timing waveform inputs outputs must be steady will be steady may change from low to high will change from low to high may change from high to low will change from high to low don?t care: changes allowed changing: state not known n/a center line is high impedance ... cs sck si so msb lsb high impedance t lead t h t su t fi t cs t lag t cyc t wl ... t ri t wh ... cs sck so si addr msb lsb t dis t ho t v ... x9401
15 fn8190.2 september 23, 2005 hold timing xdcp timing (for all load instructions) xdcp timing (for increment/decrement instruction) ... cs sck so si hold t hsu t hh t lz t hz t hold t ro t fo ... cs sck si msb lsb v w /r w t wrl ... so high impedance ... cs sck so si addr t wrid high impedance v w /r w ... inc/dec inc/dec ... x9401
16 fn8190.2 september 23, 2005 write protect and device address pins timing applications information basic configurations of electronic potentiometers cs wp a0 a1 t wpasu t wpah (any instruction) v r v w /r w +v r i three terminal potentiometer; variable voltage divider two terminal variable resistor; variable current x9401
17 fn8190.2 september 23, 2005 application circuits noninverting amplifier voltage regulator offset voltage adjustment comparator with hysteresis + ? v s v o r 2 r 1 v o = (1+r 2 /r 1 )v s r 1 r 2 i adj v o (reg) = 1.25v (1+r 2 /r 1 )+i adj r 2 v o (reg) v in 317 + ? v s v o r 2 r 1 v ul = {r 1 /(r 1 +r 2 )} v o (max) v ll = {r 1 /(r 1 +r 2 )} v o (min) 100k ? 10k ? 10k ? 10k ? +5v tl072 + ? v s v o r 2 r 1 } } attenuator filter + ? v s v o r 3 r 1 v o = g v s -1/2 g +1/2 g o = 1 + r 2 /r 1 fc = 1/(2 rc) r 2 r 4 all r s = 10k ? + ? v s r 2 r 1 r c v o x9401
18 fn8190.2 september 23, 2005 application circuits (continued) inverting amplifier equivalent l-r circuit + ? v s v o r 2 r 1 z in = r 2 + s r 2 (r 1 + r 3 ) c 1 = r 2 + s leq (r 1 + r 3 ) >> r 2 + ? v s function generator } } v o = g v s g = - r 2 /r 1 r 2 c 1 r 1 r 3 z in + ? r 2 + ? r 1 } } r a r b frequency r 1 , r 2 , c amplitude r a , r b c x9401
19 fn8190.2 september 23, 2005 packaging information 0.290 (7.37) 0.299 (7.60) 0.393 (10.00) 0.420 (10.65) 0.014 (0.35) 0.020 (0.50) pin 1 pin 1 index 0.050 (1.27) 0.598 (15.20) 0.610 (15.49) 0.003 (0.10) 0.012 (0.30) 0.092 (2.35) 0.105 (2.65) (4x) 7 24-lead plastic small outline gull wing package type s note: all dimensions in inch es (in parentheses in millimeters) 0.420" 0.050" typical 0.050" typical 0.030" typical 24 places footprint 0.010 (0.25) 0.020 (0.50) 0.015 (0.40) 0.050 (1.27) 0.009 (0.22) 0.013 (0.33) 0 - 8 x 45 x9401
20 all intersil u.s. products are manufactured, asse mbled and tested utilizing iso9000 quality systems. intersil corporation?s quality certifications ca n be viewed at www.intersil.com/design/quality intersil products are sold by description only. intersil corpor ation reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnishe d by intersil is believed to be accurate and reliable. however, no responsibility is assumed by intersil or its subsidiaries for its use; nor for any infringements of paten ts or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of intersil or its subsidiari es. for information regarding intersil corporation and its products, see www.intersil.com fn8190.2 september 23, 2005 packaging information note: all dimensions in inches (in parentheses in millimeters) 24-lead plastic, t ssop package type v .169 (4.3) .177 (4.5) .252 (6.4) bsc .026 (.65) bsc .303 (7.70) .311 (7.90) .002 (.06) .005 (.15) .047 (1.20) .0075 (.19) .0118 (.30) see detail ?a? .031 (.80) .041 (1.05) .010 (.25) .020 (.50) .030 (.75) gage plane seating plane detail a (20x) (4.16) (7.72) (1.78) (0.42) (0.65) all measurements are typical 0 - 8 x9401

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