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This signal can also be used to indicate whether the wireless modem is powered on or
not. A high level (2.7V to 2.9V) indicates that the modem is powered on. A low level
(<0.5V) indicates that the modem is powered off.
All digital logic, except the SIM interface, is characteristic CMOS logic operating at VREF.
Electrical Characteristics:
Parameter Condition Min Typ Max Unit
inactive 0.3 0.5 V
VREF output voltage
active 2.70 2.80 2.90 V
VREF output current I
OUT
200 uA
Table 5.1-2: VREF Electrical Characteristics
5.1.4 GND
Function: Ground
Description: Modem common rail
Pin Numbers: 8, 9, 10, 11, 12, 13
Signal Name: GND
If not used: Required
Details:
Return path for all currents.