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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
6
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Circuit schematics STEVAL-ISB007V1
1 Circuit schematics
Figure 1. Microcontroller section
47nF
C11
47nF
C11
R17
R17
1k5
C13
C13
100nF
100nF
1k5
TP1
TP1
1
TEST POINT
TEST POINT
C10
C10
U4
U4
100nF
100nF
VIN
34
VDDA
VDD
1
VIN
USBVCC
33
USBVCC
OSCOUT
2
OSCOUT
USBDM
32
USBDM
OSCIN
3
OSCIN
USBDP
31
USBDP
VSS
4
ST2
ST1
ADPT_CHECK
MCO
ICCDATA
27
28
29
30
7
PA1/SDA/ICCDATA
PC0/RDI
RESET
NC
RESET
8
R18
R18
VSSA
PA0/MCO
PC1/TDO
PC2/USBOE
6
5
26
9
10k
10k
NC
NC
ICCCLK
23
24
25
NC
PA3/EXTCLK
PA2/SCL/ICCCLK
VPP/TEST
AIN6/PB6/IT7
AIN7/IT8/PB7
12
11
10
VPP
CONTROL_IO
VBUS_CHECK
22
21
PA4/ICAP1/IT1
PA5/ICAP2/IT2
AIN4/IT5/PB4
AIN5/IT6/PB5
14
13
IEND
ISEL
SD
19
PA6/OCMP1/IT3
AIN3/PB3
PA7/OCMP2/IT4
AIN2/PB2
16
CHK_CHG
R19
R19
470
470
18
PB0/AIN0
AIN1/PB1
17
MODE
LED
LED
D6
D6
470
R6
R6
470
D2
D2
LED
LED
20
15
12 MHz
12 MHz
33pF
33pF
C14
33pF
C14
33pF
VIN
C12
C12
2/6
10k
R22
10k
R22