Product Specs

4
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Subject: Doc. No.: Rev: 2
UMC-STD31LF Product Specification Page 21 of 54
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Form No.: 2-JT-00022-03_001
UMC-STD31LF Product Specification
21
M3
VRTC28
2.8V
PMIC
2.8-Voltage source of RTC; the
maximum supply current is 2-
mA
M4
GND
n/a
M5
GND
n/a
M6
GND
n/a
M7
WATCHDOG
DVDD18
1.8V
PU
AD4
GPIO92
WATCHDOG trigger signal
generated from
MT2731,Customer don’t need
to control it
M8
PMIC_STATUS_B
0 to 5V
PMIC
When NAD system completed
the booting up, PMIC will pull
this pin low not only to inform
MT2731 that PMIC is ready,
but also as the outgoing status
pin reporting NAD booting is
ended.This pin would be also
connected to VSYS with the
external pull-up resistor of
100K-OHM
M9
GND
n/a
M10
GND
n/a
M11
GND
n/a
M12
GND
n/a
M13
GND
n/a
M14
GND
n/a
M15
GND
n/a
M16
GND
n/a
M17
GND
n/a
N1
VIO18_PMU
1.8V
PMIC
1.8V output source; the
maximum supply current is
200-mA
N2
AUDIO_IN2_P
-1.5 to
1.5V
PMIC
Analog AUDIO Channel2
differential input pair(P/N); the
minimum impedance loading
at input is 7K-OHM
N3
GND
n/a
N4
GND
n/a