STEVAL-ISB007V1

STEVAL-ISB007V1 Low cost Li-Ion battery charger demonstration board based on the ST7260 and L6924U Data Brief 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 ) s ( ct u d o Description r P e The STEVAL-ISB007V1 demonstration board is based on the L6924, a standalone Li-Ion/ LiPolymer battery charger. Power to the board can be supplied either by USB or an external DC adaptor. t e l o 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. ) (s s b O STEVAL-ISB007V1 t c u 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. d o r P e 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. t e l o s b O February 2009 Rev 1 For further information contact your local STMicroelectronics sales office. 1/6 www.st.com 6 2/6 D6 LED R19 470 15 14 13 12 11 10 9 8 7 6 5 MODE 17 CHK_CHG 16 IEND VPP CONTROL_IO VDD OSCOUT AIN1/PB1 AIN2/PB2 AIN3/PB3 AIN4/IT5/PB4 AIN5/IT6/PB5 VPP/TEST AIN6/PB6/IT7 AIN7/IT8/PB7 NC RESET PC0/RDI PC1/TDO PC2/USBOE VSS OSCIN NC PA1/SDA/ICCDATA PA0/MCO VSSA USBDP USBDM USBVCC VDDA PA2/SCL/ICCCLK NC NC 28 24 25 26 PB0/AIN0 PA7/OCMP2/IT4 PA6/OCMP1/IT3 PA5/ICAP2/IT2 PA4/ICAP1/IT1 PA3/EXTCLK 22 23 ST1 ST2 ICCCLK ICCDATA 27 MCO USBDP USBDM USBVCC VIN 29 30 31 32 33 34 t e l o 18 ISEL SD VBUS_CHECK 20 19 ADPT_CHECK 1 21 r P e D2 LED R6 470 R18 10k 3 OSCIN RESET 2 OSCOUT 4 1 ) (s s b O R22 10k VIN s b O t e l o t c u C12 12 MHz P e d o r VIN TP1 TEST POINT 1k5 R17 C13 100nF C11 47nF Figure 1. 33pF C14 33pF U4 1 C10 100nF Circuit schematics STEVAL-ISB007V1 Circuit schematics Microcontroller section ) s ( ct u d o 1uF C5 R14 470 R12 470 C8 8.8nF ST1 ST2 ST1 ST2 TPRG Vosns Vout 470 R5 Mode/Vpre R23 20k Iend Iac/Ipre R16 0 15 13 16 14 10 11 R24 0 ISEL Iusb/Iprg L6924D/U VinSNS R15 10k SD VPQFN16 4 3 5 Vin U2 1k R4 R9 30k t e l o R10 3.5k IEND 1uF VBAT R20 14k C6 NTC r P e LED LED D4 D3 C3 10uF VIN 2 VIN 1 7 SD + GND 1A 1nF C4 12 Vref 8 TH s b O t e l o 6 P e Voprg/Isel d o r t c u ) (s s b O 9 MODE 2 R11 10k 3 1 VIN R21 10k J11 3 1 J12 Figure 2. VIN STEVAL-ISB007V1 Circuit schematics Battery charger(1) ) s ( ct u d o 1. Pin no.description of L6924 is taken for both L6924D and L6924U.Pls refer to respective datasheets 3/6 2 Circuit schematics Figure 3. STEVAL-ISB007V1 Power supply J2 3 D7 ADPT_V 2 VIN STPS1L30U 1 6 7 8 9 C17 4.7nF Figure 4. 5 1 2 3 4 5 USB_VCC USBDM USBDP ID USB_GND SHELL SHELL SHELL SHELL .5A VBUS USB CONN1 R29 1M 1 I/O1 2 GND I/O1 6 3 I/O2 I/O2 4 USB-mini-B CONN USB-B connector VBUS r P e t e l o bs VIN VBUS_CHECK R27 10k u d o R28 10k CONTROL_IO r P e Reset VIN VSS 3 RST 1 RESET VCC 2 VIN SOT23 C1 10nF R1 4k7 U1 STM1001 4/6 R26 10k ADPT_CHECK s ( t c C2 10nF R3 1M SW1 USBDM USBDP ) s ( ct R8 22 ADPT_V R25 10k O ) STPS1L30U s b O R7 22 u d o VBUS t e l o VBUS USBLC6-2SC6 D8 Figure 5. C7 100nF U3 STEVAL-ISB007V1 2 Revision history Revision history Table 1. Document revision history Date Revision 26-Feb-2009 1 Changes Initial release. ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O 5/6 STEVAL-ISB007V1 ) s ( ct Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. u d o r P e All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. t e l o No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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