C24 Hardware Interface Manual
Version 0.3
2.10 Control and Indicators Interface
The module incorporates several interface signals for controlling and monitoring its operation. The
following section describes these signals and their operation.
TABLE 23 – Controls and Indicators
Connector
Signal Name Description
Pin
System reset output indicator.
25 RESET_N
When high, the module is operating.
2.8V regulated output.
27 VREF
Supplies external circuits up to 150mA.
26 WKUPO_N Host application wake-up signal indicator.
41 ANT_DET Antenna physical connection detect indicator.
49 CDMA Network status indicator.
39 TXEN_N Transmission burst indication.
28, 30, 32,
34, 36, 38, GPIO 1-8 General purpose IO signals for customer use.
40, 42
2.10.1 Reset
The RESET_N output signal indicates the module’s operating status. This signal is set high after power
up, when the module is operating. It is set low when the module is powered off.
When the RESET_N signal is low, the module’s application interface signals are disabled and do not
represent any valid data or state. Once the unit is turned-on, this signal must be disabled (high) for all SW
modes (including modes as re-programming, sleep etc.)
2.10.2 VREF Reference Regulator
The module incorporates a regulated voltage output, VREF. The regulator provides a 2.8V output for use
by the customer application. This regulator can source up to 150 mA of current to power any external
digital circuits.
TABLE 24 – VREF Specifications
Parameter Conditions Min
Typ Max Units
Motorola General Business Use
Page 32 of 36
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