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Smart Module Series
SA800U-WF Hardware Design
SA800U-WF_Hardware_Design 46 / 106
SA800U-WF supports battery temperature detection in the condition that the battery integrates a
thermistor (47 k
Ω 1 % NTC thermistor with B-constant of 4050 K by default; SDNT1608X473F4050FTF of
SUNLORD is recommended) and the thermistor is connected to the BAT_THERM pin. If BAT_THERM is
not connected, there will be malfunctions such as boot error, battery charging failure, battery level display
error, etc.
BAT_THERM to
BAT_RBIAS with a 12 k
Ω
resistor.
If unused, pull
BAT_THERM down to
GND with a 47 k
Ω
resistor.
BAT_P
J2-163
AI
Battery voltage detect (+)
Must be connected.
BAT_M
J2-165
AI
Battery voltage detect (-)
CS_P
J2-157
AI
Current sense (+)
CS_M
J2-159
AI
Current sense (-)
BAT_RBIAS
J3-11
PO
Power supply for NTC
pull-up circuit
If NTC = 10 k
Ω
, pull
BAT_THERM up to
BAT_RBIAS with a 12 k
Ω
resistor.
If NTC = 47 k
Ω
, keep
BAT_RBIAS open.
BAT_ID
J3-16
AI
Battery type detect
SMB_USB_IN
J3-2, J3-3,
J3-4, J3-5,
J3-6, J3-7
PO
Power output for SMB1355
parallel charging
Parallel charging is not
supported by default and
if it is needed please
contact Quectel Technical
Support.
If unused, keep these pins
open.
SMB_CS_P
J3-15
AI
SMB1355 parallel charging
current sense (+)
SMB_CS_M
J3-14
AI
SMB1355 parallel charging
current sense (-)
SMB_THERM
J3-17
AI
SMB1355 parallel charging
temperature detect
SMB_EN_CHG J3-9
DO
SMB1355 parallel charging
enable
SMB_STAT
J3-10
DI
SMB1355 parallel charging
status indicator