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Smart Module Series
SA800U-WF Hardware Design
SA800U-WF_Hardware_Design 31 / 106
BAT_THERM
J2-143
AI
Battery
temperature
detect
Internally pulled
up.
Supports 47 k
Ω
NTC by default -
externally connect
BAT_THERM to
47 k
Ω NTC to
GND.
If you need to
connect 10 k
Ω
NTC, pull up
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.