Module_Pwr_En_B; Vref - Wavecom CM52 Integrator's Manual

MODULE_PWR_EN_B

3.1.1
This signal, located on pin 12 in the system connector, enables the main 5V supply in the phone
Wireless CPU
reference voltage is the VCC_MAIN supply.

VREF

3.1.2
This signal, located on pin 2 in the system connector, provides the application with its logic supply
voltage. The application shall current-amplify this signal to use it as a supply (VREF_CA) for its
interface circuitry to the Wireless CPU
CM52 Integrators' Manual
WI_DEV_CM52_UGD_001-001
Page 39 of 53
Application
0 = Phone Module Power OFF
1 = Phone Module Power ON
5V
VREF_CA
10uF
Shutdown Indicate
Shutdown Request
Ring Indicator
Figure 20: Status Group Diagram
so that it powers on. This is an open collector input to the phone Wireless CPU
®
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
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5V
0 -10 ohm
0 - 1k
0
+
-
100
VCC
1 - 100k
VREF_CA
.
®
CM52 Integrators' Manual
Phone Module
12, MODULE_PWR_EN_B
2, VREF
1M
15, HW_SD
40, RI
. Its
®