User guide

CM52 Integrators’ Manual
WI_DEV_CM52_UGD_001-001
Page 41 of 53
CM52 Integrators’ Manual
Shut down sequence
1. To request a shutdown of the phone module, the application should provide an active low
pulse of 100 ± 25 ms on the HW_SD pin through an open collector output.
2. This pulse is detected by the Wireless CPU
®
, which confirms the request by enabling its
HW_SD output, setting it active low.
3. The application waits for the HW_SD pin to become inactive high.
4. The Wireless CPU
®
has performed its power down sequence and disables its output
resulting in HW_SD becoming inactive high.
5. The application shuts down, disabling MODULE_PWR_EN_B.
HW_SD
Shutdown
Request
Shutdown
Confirm
1423
MODULE_
PWR_EN_B
5
Figure 22: Shut Down Sequence Timeline
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable