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
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
STEVAL-ISB007V1 Circuit schematics
Figure 2. Battery charger
J12
J12
470
470
1k
1k
1nF
1nF
3
3
VBAT
11
TH
8
U2
U2
12
1
2
J11
J11
1
2
NTC
R5
R5
R4
R4
C4
C4
(1)
VIN
R21
10k
R21
10k
10k
R11
10k
R11
MODE
C6
C6
1uF
1uF
16
14
10
Vout
Vosns
Iac/Ipre
Mode/Vpre
Vref
R20
14k
R20
14k
R10
3.5k
3.5k
15
R10
R9
30k
R9
30k
ISEL
0
R24
R24
0
IEND
13
Iend
Iusb/Iprg
Voprg/Isel
9
GND
6
L6924D/U
L6924D/U
SD
7
R16
0
0
R16
R23
20k
R23
20k
VIN
VIN
TPRG
VinSNS
Vin
5
2
1
VIN
ST2
ST1
ST2
4
3
VPQFN16
ST1
R15
10k
R15
SD
10k
1A
470
R12
R12
D3
D3
470
R14
470
R14
470
LED
LED
LED
D4
D4
LED
8.8nF
C8
8.8nF
C3
C3
C8
+
+
10uF
10uF
C5
1uF
C5
1uF
1. Pin no.description of L6924 is taken for both L6924D and L6924U.Pls refer to respective datasheets
3/6
Circuit schematics STEVAL-ISB007V1
Figure 3. Power supply
D7
D7
STPS1L30U
STPS1L30U
1
2
3
I/O1
GND
I/O2
VIN
5
VBUS
USBLC6-2SC6
U3
U3
C7
C7
100nF
100nF
I/O1
I/O2
R7
R7
USBDM
22
6
4
22
R8
R8
22
22
USBDP
C17
C17
4.7nF
4.7nF
USB CONN1
USB CONN1
6
SHELL
7
SHELL
8
SHELL
9
SHELL
R29
R29
1M
1M
USB-mini-B CONN
USB_VCC
USBDM
USBDP
USB_GND
J2
J2
1
2
3
4
ID
5
3
2
1
VBUS
ADPT_V
.5A
Figure 4. USB-B connector
VBUS
Figure 5. Reset
D8
D8
STPS1L30U
STPS1L30U
U1
U1
VSS
RST
VCC
STM1001
SOT23
VIN
3
1
2
VBUS_CHECK
RESET
VIN
SW1
SW1
VBUS
R1
R1
4k7
4k7
R25
R25
10k
10k
R27
R27
10k
10k
R3
R3
1M
1M
ADPT_CHECK
CONTROL_IO
VIN
C1
C1
10nF
10nF
C2
C2
10nF
10nF
ADPT_V
R26
R26
10k
10k
R28
R28
10k
10k
4/6
STEVAL-ISB007V1 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
26-Feb-2009 1 Initial release.
5/6
STEVAL-ISB007V1
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