User guide

CM52 Integrators’ Manual

WI_DEV_CM52_UGD_001-001

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CM52 Integrators’ Manual

Phone ModuleApplication

12, MODULE_PWR_EN_B

0 = Phone Module Power OFF

1 = Phone Module Power ON

0 - 1k

0 -10 ohm

2, VREF

10uF

VREF_CA

40, RI

1 - 100k

VCC

Ring Indicator

15, HW_SD

100

Shutdown Request

Shutdown Indicate

Figure 20: Status Group Diagram

3.1.1 MODULE_PWR_EN_B

This signal, located on pin 12 in the system connector, enables the main 5V supply in the phone

Wireless CPU

so that it powers on. This is an open collector input to the phone Wireless CPU

. Its

reference voltage is the VCC_MAIN supply.

3.1.2 VREF

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

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