ST ISB007V1 User Manual

Low cost Li-Ion battery charger demonstration board

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/ LiPolymer 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.

STEVAL-ISB007V1

based on the ST7260 and L6924U

Data Brief

STEVAL-ISB007V1

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.

February 2009 Rev 1 1/6

For further information contact your local STMicroelectronics sales office.

www.st.com

Circuit schematics STEVAL-ISB007V1

1 Circuit schematics

Figure 1. Microcontroller section

47nF

C11

47nF

C11

R17

1k5

C13

100nF

1k5

TP1

TEST POINT

C10

100nF

VIN

VDDA

VDD

VIN

USBVCC

OSCOUT

USBDM

OSCIN

USBDP

VSS

ST2

ST1

ADPT_CHECK

MCO

ICCDATA

PA1/SDA/ICCDATA

PC0/RDI

RESET

R18

VSSA

PA0/MCO

PC1/TDO

PC2/USBOE

10k

ICCCLK

PA3/EXTCLK

PA2/SCL/ICCCLK

VPP/TEST

AIN6/PB6/IT7

AIN7/IT8/PB7

VPP

CONTROL_IO

VBUS_CHECK

PA4/ICAP1/IT1

PA5/ICAP2/IT2

AIN4/IT5/PB4

AIN5/IT6/PB5

IEND

ISEL

PA6/OCMP1/IT3

AIN3/PB3

PA7/OCMP2/IT4

AIN2/PB2

CHK_CHG

R19

470

PB0/AIN0

AIN1/PB1

MODE

LED

470

LED

12 MHz

33pF

C14

33pF

C14

33pF

VIN

C12

2/6

10k

R22

10k

R22

+ 4 hidden pages