data brief for further information contact your local stmicroelectronics sales office. november 2008 rev 1 1/4 4 STEVAL-ISB006V1 dual usb/wall adapter li-ion ba ttery charger with gas gauge demonstration board based on the stw4102 features constant current cons tant voltage (cccv) charger dual charging source (main adaptor or usb cable) fast charge current control up to 1a for main adaptor and up to 500 ma for usb internal power device and sense resistor, option for external components for current higher than 1a programmable charge voltage (4.1 v, 4.2 v, 4.3 v, 4.35 v) with 1% accuracy thermal regulation trickle charge mode at low battery voltage main adaptor voltage up to 16 v battery overvoltage protection at 4.7 v gas gauge with 13 bit ad converter battery voltage monitor with 7-12 bit adc i 2 c interface for device monitoring and control charge status output pin power detection output pin programmable watchdog security timer 4.7 v ldo regulator (external mosfet) description the STEVAL-ISB006V1 demonstration board is based on the stw4102, a stand-alone constant- current constant-voltage (cccv) linear charger dedicated for li-ion battery. this device allows dual charging capabilit y using the main input adaptor up to 1a (wall adaptor, car adaptor) or usb cable up to 500 ma without external component. upper 1 a charging is possible by adding just one external transistor. this demonstration board offers programmable fast charge current up to 1a with external resistor. a thermal regulation circ uitry limits the charge current against the die high power dissipation or high ambient temperature. an end of charge output pin indicates the charge termination when the fast charge current drops below 10% of the programmed current value. the stw4102 contains an accurate gas gauge based on a 13 bit ad converter. external resistor is used between battery and ground to sense a charge/discharge current. with a typical 30 m ? resistor, current can be up to 2.5 a. STEVAL-ISB006V1 www.st.com
circuit schematic STEVAL-ISB006V1 2/4 1 circuit schematic figure 1. schematic u s bpwr 3 pwrdetectn 24 eochg 22 ldodrv 5 ldofb 6 s cl 17 s da 16 re s etn 15 vio 1 8 gnd 9 te s t 2 3 icg- 12 icg+ 11 driver 4 s tdby 14 cv i s 10 i s et 7 batt s en s e 21 batt 20 s en s e 19 ep a d c 3 2khz 1 3 s tw4102 main 1 vout 2 cvref 8 ic1 r2 10k v ba t 1 main 1 pwrdt 1 eoch c2 1 u f/6. 3 v/x5r 1 vio 1 s cl 1 s da r4 10k 1 r s t 1 cg- 1 cg+ 1 s tby 1 c 3 2 c1 1 u f/6. 3 v/x5r r1 12k +/-1 % 1 batt 1 b s en s e c4 22 u f/6. 3 v/x5r 1 phone v ba t 1 drv s 1 0r 1 vout m2a s t s 2dpf s 20v m2b s t s 2dpf s 20v c 3 22 u f/6. 3 v/x5r 1 te s t c5 100nf/16v/x7r c7 100nf/16v/x7r 1 u s b c6 100nf/16v/x7r m1 s tt4pf20v r 3 r0 33 +/-1 % 0 8 05 1 gnd 3 bl1 logo_pcb s 2 0r 1 gndbatt 1 gnd6 1 gnd7 1 gnd 8 1 gnd10 1 gnd11 1 gnd12 1 s en s e 1 i s et am0 3 2 8 7v1
STEVAL-ISB006V1 revision history 3/4 2 revision history table 1. document revision history date revision changes 27-nov-2008 1 initial release.
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