ADLINK BattMan: Smart Battery Management Reference Design - Manual (Page 13)

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AC
Adapter
110/220V AC
19V
D
C
HDD
BattMan
Smart Battery
Management
Module
COM Express Carrier
12
V
5V
sb
GN
D
Ho
st
S
M
B
_
CLK
Ho
st
S
M
B
_
D
A
T
Ho
st
S
M
B
_
Al
er
t
COM
Express
Module
with
Smart Battery
support
in BIOS
B15
B14
B13
Smart
Battery 1
VBAT1 +
VBAT1 -
Thermistor 1
Local SMB_CLK
Local SMB_DAT
Smart
Battery
VBAT1 +
VBAT1 -
Thermistor 1
Local SMB_CLK
Local SMB_DAT
3 Functional Block Diagram
The BattMan module provides 12V and 5Vsb to the COM Express Carrier Board and 12V and
5V to the Auxiliary Power connector to support a storage device.
The BattMan module communicates with the COM Express host system via the Host SMBus
interface. The BattMan module acts as a slave and the COM Express module sends
commands to the BattMan module to get information. The three SMBus signals SMB_CLK,
SMB_DAT and SMB_ALERT# correspond to pins B13, B14 and B15 on the AB connector of
the COM Express module. A Local SMBus is used for communciations between the BattMan
module and Smart Batteries.