Controls And Indicators Interface; Reset; Vref Reference Regulator; Controls And Indicators - Motorola 8900 - Blackberry Curve Cell Phone OEM Car Charger Developer's Manual

Controls and Indicators Interface

Controls and Indicators Interface
The C24 incorporates several interface signals for controlling and monitoring the module's
operation. The following paragraphs describe these signals and their operation.
Table 2-19

Reset

The RESET_N output signal indicates the C24's operating status. This signal is set high after
power up, when C24 is operating. It is set low when C24 is powered off.
When the RESET_N signal is low, the C24 interface signals are disabled and do not represent any
valid data or state. Furthermore, any input signals connected to the C24 interface must be
disabled (tri-state) or set low when RESET_N is low.

VREF Reference Regulator

The C24 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.
40
gives a description of the controls and indicators signals.
Table 2-19: Controls and Indicators
Connector Pin Signal Name
25 RESET_N
27 VREF
26 WKUPO_N
41 ANT_DET
49 CDMA
39 TXEN_N
28, 30, 32, 34, 36, GPIO 1-8
38, 40, 42
C24 Module Hardware Description
Description
C24 system reset output indicator.
When high, C24 is operating.
2.80V regulated output.
Supplies external circuits up to
150mA.
Host application wake-up signal indi-
cator.
Antenna physical connection detect
indicator.
Network status indicator.
Transmission burst indication.
General purpose IO signals for cus-
tomer use.
December 15, 2008