data brief for further information contact your local stmicroelectronics sales office. february 2009 rev 1 1/6 6 STEVAL-ISB007V1 low cost li-ion battery charger demonstration board based on the st7260 and l6924u features can be used in usb mode or adapter mode leds indicate status of charging conditions icc connector available to program the microcontroller li-ion / li-polymer battery charger description the STEVAL-ISB007V1 demonstration board is based on the l6924, a standalone li-ion/ li- polymer battery charger. power to the board can be supplied either by usb or an external dc adaptor. in usb mode, the charging current of the battery complies with high-power usb device specifications. the l6924 is powered by 5 v from the usb, thus also charging the battery. an st7260 microcontroller is used for enumeration with the pc, to control the sd pin and to ensure compliance with usb high-power bus-powered specifications. the board also features a general-purpose adaptor socket for use when the board is powered by an external dc supply. in this case the l6924 is completely independent of the microcontroller. STEVAL-ISB007V1 www.st.com
circuit schematics STEVAL-ISB007V1 2/6 1 circuit schematics figure 1. microcontroller section chk_chg i s el iend vin vin s d iccclk iccdata u s bdp s t1 s t2 u s bdm u s bvcc mco vpp re s et o s cin o s cout mode vin vbu s _check adpt_check control_io 33pf c14 33pf c14 u4 u4 nc 9 vdd 1 o s cout 2 o s cin 3 v ss 4 pc2/u s boe 5 pc1/tdo 6 pc0/rdi 7 re s et 8 ain7/it8/pb7 10 ain6/pb6/it7 11 vpp/te s t 12 ain5/it6/pb5 13 vdda 34 u s bvcc 33 u s bdm 32 u s bdp 31 v ss a 30 pa0/mco 29 pa1/ s da/iccdata 28 nc 27 nc 26 nc 25 pa2/ s cl/iccclk 24 pa5/icap2/it2 21 pa6/ocmp1/it3 20 ain4/it5/pb4 14 ain3/pb3 15 ain1/pb1 17 ain2/pb2 16 pb0/ain0 18 pa7/ocmp2/it4 19 pa3/extclk 23 pa4/icap1/it1 22 12 mhz 12 mhz led d2 led d2 10k r18 10k r18 tp1 te s t point tp1 te s t point 1 100nf c10 100nf c10 47nf c11 47nf c11 led d6 led d6 100nf c13 100nf c13 10k r22 10k r22 33pf c12 33pf c12 470 r19 470 r19 470 r6 470 r6 1k5 r17 1k5 r17
STEVAL-ISB007V1 circuit schematics 3 /6 figure 2. battery charger (1) 1. pin no.description of l6924 is taken for both l692 4d and l6924u.pls refer to respective datasheets s t2 vbat iend vin vin s t1 s d vin i s el mode vin ntc vpqfn16 1a + c3 10 u f + c3 10 u f d3 led d3 led r11 10k r11 10k r20 14k r20 14k r10 3.5k r10 3.5k j11 j11 1 2 3 r21 10k r21 10k r24 0 r24 0 r15 10k r15 10k r5 470 r5 470 c4 1nf c4 1nf c5 1 u f c5 1 u f c6 1 u f c6 1 u f d4 led d4 led r23 20k r23 20k u2 l6924d/u u2 l6924d/u vin 1 vin s n s 2 s t2 3 s t1 4 tprg 5 gnd 6 s d 7 th 8 voprg/i s el 9 vo s n s 10 vo u t 11 vref 12 iend 13 mode/vpre 14 i usb /iprg 15 i a c/ipre 16 r16 0 r16 0 r14 470 r14 470 r4 1k r4 1k c8 8.8nf c8 8.8nf j12 j12 1 2 3 r12 470 r12 470 r9 30k r9 30k
circuit schematics STEVAL-ISB007V1 4/6 figure 3. power supply figure 4. usb-b connector figure 5. reset adpt_v vin usbdm usbdp vbus usb-mini-b conn usblc6-2sc6 .5a 100nf c7 100nf c7 c17 4.7nf c17 4.7nf r29 1m r29 1m u3 u3 gnd 2 i/o1 6 i/o2 3 i/o2 4 i/o1 1 5 vbus usb conn1 usb conn1 usb_vcc 1 usbdm 2 usbdp 3 usb_gnd 5 shell 6 shell 7 shell 8 id 4 shell 9 d7 stps1l30u d7 stps1l30u r8 22 r8 22 r7 22 r7 22 j2 j2 3 1 2 vbu s _check control_io adpt_check vbu s adpt_v vbu s vin r27 10k r27 10k r25 10k r25 10k d8 s tp s 1l30u d8 s tp s 1l30u r28 10k r28 10k r26 10k r26 10k vin vin re s et s ot23 s tm1001 1m r3 1m r3 10nf c1 10nf c1 u1 u1 v ss 3 r s t 1 vcc 2 s w1 s w1 4k7 r1 4k7 r1 10nf c2 10nf c2
STEVAL-ISB007V1 revision history 5/6 2 revision history table 1. document revision history date revision changes 26-feb-2009 1 initial release.
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