资料介绍
With the PICREF-5 Reference Design, the design engineer will be able to
quickly develop an SMBus Level 3 Smart Battery Charger/Selector.
The design consists of a PIC16C73A microcontroller that handles all the
hardware control and communications to meet both the SMBus Level 3
Smart Battery Charger Specification 1.0 and Smart Battery and Smart
Battery Selector Specification 1.0. It combines the Smart Battery Charger
and Smart Battery Selector under single-chip control.
The hardware supports selection and charging of up to two independant
battery packs. The PICREF-5 Reference Design includes many safety
features such as PIC16C73A control selection of a single battery pack, so
that the unselected battery cannot be active on the bus. This eliminates
cross control and cross communication situations, which may lead to
unexpected operation. As an added safety feature, thermistor monitoring is
always available on both battery packs, regardless of the selected battery
pack.
Immediate switching of the power source is implemented by use of three
diode mode operation. If AC power or the active battery pack is removed
from the system, there is no switch over time. The selector also supports
end-of-discharge detection of the battery pack, so that switching to an
alternate power source automatically takes place.
The charger can act as a master to initiate charging, which allows the
charger to poll batteries for charging information. The PIC16C73A then PICREF-5
SMBus Level-3 Battery Charger/Selector Reference Design
Based on the PIC16C73A
NEW
Wall Adapter VDC VCHG VOUT System
Charger
+24V DC Circuitry Power
CNTL VDC
VB1 VB1
VB2
Smar
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