Phytec phyCORE-PXA270, Hardware Manual

Page: 25 / 114

Power Supply
Battery Charger Circuitry for 6 NiMH Batteries
The Carrier Board can be populated with an optional battery charger
circuit for six (when using a 12 V input voltage, up to 12 possible,
requires different hardware configuration and 24 V input voltage)
NiMH batteries. In this case the BQ24703 battery charge controller
switches the voltage from the power adapter to battery operation. It
will charge the batteries when the Carrier Board is supplied with
power through a wall adapter.
E N A B L E
I B A T
A C S E L
A C P R E S
A L A R M
T E M P
B Q 2 4 7 0 3
8 - 2 4 V
I N P U T
8 - 2 4 V
o r V a k k u
O U T P U T
Figure 10: Battery Charger Circuitry
Note:
The battery charger register (Control PLD register 11, refer to
section 5.2.1 ) is only available with PCB revision 1220.2 and higher.
VBAT Supply and DeepSleep
The PXA270 controller can enter a so-called DeepSleep mode. In this
mode only the battery supply VBAT is required for powering the
controller. All other voltages can be turned off in this mode. For this
purpose the controller signal SYS_ENA is available. This feature is
activate via Jumper J19 on the Carrier Board. If SYS_ENA = "0" all
three supply voltages are turned off.
©
PHYTEC Meßtechnik GmbH 2006 L-668e_1
17