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general description the max1535a evaluation kit (ev kit) is an efficient, multichemistry battery charger. it uses the intel system management bus (smbus) to control the battery reg- ulation voltage, charger current output, and input cur- rent-limit set point. the max1535a ev kit can charge one, two, three, or four series li+ cells with a current up to 8a. the max1535a evaluation system (ev system) consists of a max1535a ev kit and the maxim smbusmon board. the max1535a ev kit includes windows 95-/98-/ 2000-/xp-compatible software to provide a user-friendly interface. features ? 0.5% battery voltage accuracy ? 3% battery charge-current accuracy ? input current-limiting set point through smbus command ? up to 8a battery charge current ? automatic selection of system power source ? +8v to +25v input voltage range ? charges li+, nicd, nimh battery chemistries ? smbus-compatible 2-wire serial interface ? includes windows 95-/98-/2000-/xp-compatible software and demo pc board ? fully assembled and tested evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system ________________________________________________________________ maxim integrated products 1 19-2974; rev 1; 3/04 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range ic package sm b u s i n t er f a c e t ype m a x1 5 3 5 a evk i t 0c to + 70c 32 thi n qfn ( 5m m x 5m m ) m a x1 5 3 5 a evsys 0c to + 70c 32 thi n qfn ( 5m m x 5m m ) smbusmon ordering information supplier phone fax website avx 843-946-0238 843-626-3123 www.avxcorp.com diodes inc. 805-446-4800 805-446-4850 www.diodes.com general semiconductor 760-804-9258 760-804-9259 www.gensemi.com international resistive co. (irc) 361-992-7900 361-992-3377 www.irctt.com kemet 864-963-6300 864-963-6322 www.kemet.com murata 770-436-1300 770-436-3030 www.murata.com on semiconductor 602-244-6600 602-244-4545 www.onsemi.com sumida 847-545-6700 847-545-6720 www.sumida.com taiyo yuden 800-348-2496 847-925-0899 www.t-yuden.com tdk 847-803-6100 847-390-4405 www.component.tdk.com vishay dale 402-564-3131 402-563-6296 www.vishay.com component suppliers smbus is a trademark of intel corp. windows is a registered trademark of microsoft corp. note: please indicate you are using the max1535a when contacting these manufacturers.
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system 2 _______________________________________________________________________________________ component list designation qty description c1 1 2.2? ?0%, 35v b-size tantalum capacitor avx tajb225m035 kemet t491b225m035as c2 1 1? ?0%, 25v x7r ceramic capacitor (1206) murata grm31mr71e105k taiyo yuden tmk316bj105kl tdk c3216x7r1e105k c3, c4, c5 3 0.01? ?0%, 50v x7r ceramic capacitors (0603) murata grm188r71h103k taiyo yuden umk107b103kz tdk c1608x7r1h103k c6, c8, c10 3 0.1? ?0%, 25v x7r ceramic capacitors (0603) murata grm188r71e104k tdk c1608x7r1e104k c7, c9 2 1? ?0%, 16v x7r ceramic capacitors (0805) murata grm21br71c105k taiyo yuden emk212bj105kg tdk c2012x7r1c105k c11, c12, c15, c16 0 not installed (2220) c13, c14, c17, c18 4 22? ?0%, 25v x5r ceramic capacitors (2220) tdk c5750x5r1e226m c19?22 0 not installed (0805) c24 1 3300pf ?0%, 50v x7r ceramic capacitor (0603) murata grm188r71h332k taiyo yuden umk107b332kz tdk c1608x7r1h332k designation qty description d1 1 0.5a, 30v schottky diode (sod123) diodes inc. b0530w general semiconductor mbr0530 on semiconductor mbr0530 d2 0 not installed j1 1 2 x 10 right-angle female receptacle j2 1 smart-battery header assembly, right angle, keyless, five position ju1, ju2, ju3 0 not installed l1 1 4.3?, 11a, 11.4m ? inductor sumida cep125-4r3mc-u n1 1 13.5a, 30v n - channel m os fe t ( s o 8) fairchild fds6670s p1?8 8 - 13a, - 30v p - channel m os fe ts ( s o8) fai r chi l d fd s 6679z r1, r2 2 0.01 ? ? 1%, 1w sens e r esi stor s ( 2512) v i shay d al e w s l2512 0.010 1.0% irc lrc - lrf251 2- 01- r010- f r3 1 365k ? ?% resistor (0805) r4 1 49.9k ? ?% resistor (0805) r5 1 1m ? ?% resistor (0805) r6, r7, r16?19 0 not installed (0603) r8 1 20k ? ?% resistor (0603) r9?12 4 10k ? ?% resistors (0805) r13 1 33 ? ?% resistor (0805) r14, r15 0 not installed r20 1 5.1 ? ?% resistor (0603) r21 1 69.8k ? ?% resistor (0603) r22 1 49.9k ? ?% resistor (0603) r23 1 14.7k ? ?% resistor (0603) r24 1 100k ? ?% resistor (0603) r25 1 10 ? ?% resistor (0603) u1 1 max1535aetj, 32-pin, 5mm x 5mm, thin qfn
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system _______________________________________________________________________________________ 3 quick start recommended equipment ? dc source to supply the input current to the charger. this source must be capable of supplying a voltage greater than the battery-voltage set point and have sufficient current rating. ? voltmeter ? smart battery ? computer running windows 95, 98, 2000, or xp ? 9-pin serial extension cable ? smbusmon board procedure the max1535a ev kit is a fully assembled and tested board. follow the steps below to verify board operation. do not turn on the power supply until all connec- tions are completed. observe all precautions on the battery manufacturer? data sheet. 1) set the vpp jumper on the smbusmon board to vcc5. 2) carefully connect the boards by aligning the 20-pin connector of the max1535a ev kit with the 20-pin header of the smbusmon board. gently press them together. 3) connect a cable from the computer? serial port to the smbusmon interface board. use a straight-through 9-pin female-to-male cable. 4) install the software by running the install.exe program. the install program copies the files and creates icons for them in the windows 95/98/2000/xp start menu. an uninstall program is included with the software. click on the uninstall icon to remove the ev kit software from the hard drive. 5) connect power to the smbusmon board. 6) connect the input-current supply across the adapter_in and pgnd pads. 7) connect a smart battery to connector j2. 8) turn on the power supply. 9) start the max1535a ev kit software. 10) verify current is being delivered to the battery. detailed description of software the max1535a program provides easy access to the max1535a registers. it is also capable of reading the registers of a smart battery and monitoring smbus traffic. upon execution of the program, the software enables the max1535a smart-charger command panel (figure 1), after which any of the allowed smbus commands can be sent to the max1535a. refer to the max1535a data sheet for more information regarding the allowed smbus commands. smart-charger command panel chargevoltage() to issue the chargevoltage() command to the max1535a, enter the desired voltage, in millivolts, into the charging voltage edit field and select the adjacent write button. chargecurrent() to issue the chargecurrent() command to the max1535a, enter the desired current, in milliamps, into the charging current edit field and select the adjacent write button. auto rewrite checkboxes the max1535a needs to receive a chargevoltage() or chargecurrent() command every 175s (typ); otherwise, the max1535a times out and terminates charging. usually, a smart battery sends these necessary com- mands. however, when not using a smart battery with the max1535a ev kit, select either (or both) of the auto rewrite checkboxes located directly under the charging current and charging voltage edit fields. this generates a chargevoltage() or chargecurrent() command at the selected time interval located on the timer panel. chargermode() to issue the chargermode() command to the max1535a, select a combination of checkboxes in the charger mode panel of commands. each checkbox represents a bit in the chargermode() command word. select the checkboxes next to the bits for which the software should write a 1, unselect the checkboxes for a 0. send the command by selecting the write button. chargerstatus() charger status is shown in the charger status panel. each of the bits in the chargerstatus() command word are shown individually with a short description of the bit. by default, the status is automatically read once every two seconds. disable this feature by unselecting the active read: charger checkbox located on the timer panel. change the refresh time by entering a new value into the timer interval edit box and select the set interval button. when auto refresh is disabled, issue a chargerstatus() command by selecting the read button on the charger status panel.
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system 4 _______________________________________________________________________________________ chargerspecinfo() chargerspecinfo() returns the charger specification (0x0002) from the max1535a. this command is available through the ?ther bitmapped charger registers... panel. select charger spec info by picking it from the pulldown list located directly under the other bitmapped charger registers... label. issue a chargerspecinfo() command by selecting the read button. the returned hexadecimal value is shown at the bottom of the panel. alarmwarning() alarm warning is shown on the other bitmapped charger registers... panel (figure 2). select alarm warning by picking it from the pulldown list located directly under the other bitmapped charger registers... label. each of the bits in the alarmwarning() command word are shown individually with a short description of the bit and a checkbox. select the checkboxes next to the bits for which the software should write a 1; unselect the check- boxes for a 0. send the command to the max1535a by selecting the write button. inputcurrent() input current is shown on the other bitmapped charger registers... panel (figure 2). select input current by picking it from the pulldown list located directly under the other bitmapped charger registers... label. each of the bits in the inputcurrent() command word are shown indi- vidually with a short description of the bit and a check- box. select the checkboxes next to the bits for which the software should write a 1; unselect the checkboxes for a 0. send the command to the max1535a by selecting the write button. note: the default input-current-limit setting at por is 256ma. all codes requesting input current greater than 11.004a result in an input-current overrange, limiting the input current to 11.004a. manufacturerid() manufacturerid() returns the manufacturer id (0x004d) from the max1535a. this command is available through the other bitmapped charger registers... panel (figure 2). select manufacturer id by picking it from the pulldown list located directly under the other bitmapped charger registers... label. issue a manufacturerid() command by selecting the read button. the returned hexadecimal value is shown at the bottom of the panel. deviceid() deviceid() returns the device id (0x0006) from the max1535a. this command is available through the other bitmapped charger registers... panel (figure 2). select device id by picking it from the pulldown list located directly under the other bitmapped charger registers... label. issue a deviceid() command by selecting the read button. the returned hexadecimal value is shown at the bottom of the panel. smart-battery command panel the software is capable of reading the registers of a smart battery. the smart battery page of the software is shown in figure 3. the software only reads the registers selected with checkmarks. by default, the registers are automatically read once every two seconds. disable this feature by unselecting the active read: battery checkbox located on the timer panel. change the refresh time by entering a new value into the timer interval edit box and select the set interval button. when auto refresh is dis- abled, read the battery by selecting the refresh button. detailed description of hardware the max1535a includes all the functions necessary to charge a smart battery. the ev kit is capable of charg- ing with a maximum current of 8.064a and a maximum voltage of 19.2v. for more information on the operation of the max1535a, refer to the detailed description sec- tion of the max1535a data sheet. connecting a smart battery the max1535a ev kit includes a 5-pin smart battery connector. to connect a smart battery to the ev kit, turn off power to the ev kit and connect the battery, making sure to correctly orient the connectors. evaluating the max1535a above 25v to evaluate the max1535a with an input voltage greater than 25v (up to 28v), capacitors c1, c2, c13, and c14 must be replaced with higher voltage-rating parts. any capacitors that were installed in locations c11, c12, c19, and c20 must also meet the higher voltage rating.
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system _______________________________________________________________________________________ 5 figure 1. max1535a smart-charger command panel
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system 6 _______________________________________________________________________________________ figure 2. max1535a smart-charger command panel showing the pulldown list for charger spec info, alarm warning, input current, manufacturer id, and device id
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system _______________________________________________________________________________________ 7 figure 3. smart-battery command panel
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system 8 _______________________________________________________________________________________ addpwr_s adapter_in pgnd r3 365k ? 1% r4 49.9k ? 1% ldo r5 1m ? r6 short r7 short r8 20k ? c3 0.01 f c4 0.01 f c5 0.01 f vdd vdd thm sda scl int agnd smbclk smbalert vdd vdd smbdata c24 3300pf thm r12 10k ? r11 10k ? r9 10k ? r10 10k ? c2 1 f r25 10 ? d1 c1 2.2 f d2 open src pds pds 3 1 2 65 78 4 1 32 p1 32 7 8 5 6 p2 1 4 pds pds 65 78 c6 0.1 f ref c7 1 f 11 r21 69.8k ? 1% 4 5 r14 open ref 10 ref 18 r22 49.9k ? 1% 9 r23 14.7k ? 1% r24 100k ? 1% r15 open 17 ref ref c15 open c16 open c17 22 f c18 22 f batt- batt+ batt+ r2 0.01 ? 1% r19 short c22 open c21 open r18 open 3 2 1 n1 4 7 8 6 5 l1 4.3 h dhi 4 p5 65 7 8 3 2 1 dhi 4 p6 65 7 8 3 2 1 c9 1 f r13 33 ? r20 5.1 ? c10 0.1 f pld 4 1 p7 6 5 3 2 pld 4 addpwr_d revblk_d 7 8 32 5 6 1 4 27 1 3 32 6 7 8 12 13 14 15 16 31 29 r16 short r1 0.01 ? 1% c19 open c20 open r17 short 28 25 src c8 0.1 f ju1 ju2 ju3 revblks c11 open c12 open c13 22 f c14 22 f load 3 2 78 65 p8 78 batt+ 30 2 24 26 23 22 21 20 19 max1535a u1 acok pdl dhiv cssn cssp pds src dcin acin acok ccs cci ccv v dd thm sda scl int dac ref gnd gnd imax vmax i.c. batt csin csip pgnd dlo ldo dlov dhi p4 p3 4 ldo 1 vdd figure 4. max1535a ev kit schematic
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system _______________________________________________________________________________________ 9 batt+ j2-1 j2-6 batt- thm smbdata smbclk j2-2 j2-7 j2-3 j2-8 j2-4 j2-9 j2-5 j2-10 smart battery connector j1-1 j1-3 j1-5 j1-7 j1-9 j1-11 j1-13 j1-15 j1-17 j1-19 nc nc nc smbalert nc smbclk smbdata vdd j1-2 j1-4 j1-6 j1-8 j1-10 j1-12 j1-14 j1-16 j1-18 j1-20 nc header-20p figure 5. max1535a ev kit schematic?mart battery connector
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system 10 ______________________________________________________________________________________ figure 6. max1535a ev kit component placement guide?omponent side
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system ______________________________________________________________________________________ 11 figure 7. max1535a ev kit pc board layout?omponent side
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system 12 ______________________________________________________________________________________ figure 8. max1535a ev kit pc board layout?dd and power ground plane
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system ______________________________________________________________________________________ 13 figure 9. max1535a ev kit pc board layout?round plane
evaluate: max1535a max1535a evaluation kit/ max1535a evaluation system maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. figure 10. max1535a ev kit pc board layout?older side

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