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MANUAL
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4 Application
Scenarios
This section lists different features and describes how to implement them.
•
Module power ON/OFF
•
Alarm application wakeup
•
SIM insertion and removal
4.1 Module power ON/OFF
The application powers the module on and off using the following signals:
•
VCC_MAIN
•
VCC_AUX
•
MODULE_PWR_EN_B
•
VREF
•
HW_SD
Sequence:
1. Power ON (1):
Application performs a power up of the phone-module. VCC_MAIN, VCC_AUX, and
MODULE_PWR_EN_B can all be set active at the same time. VREF will go active high out to the application
as soon as the internal regulators becomes active.
2. Power
OFF
(2-7):
The application provides an active low pulse with duration of 300 ± 25 ms on the HW_SD
pin through an open collector output, requesting a power down of the phone-module.
3.
This pulse is detected by the phone-module, which confirms the request by enabling its HW_SD output, setting
it active low.
4.
The application waits for the HW_SD pin to become inactive high, which should take less than 10s. If the
HW_SD pin has not become inactive within this 10s period it is safe for the application to continue the power off
sequence.
5.
The module has performed its power down sequence and disables its output resulting in HW_SD becoming
inactive high. This is detected by the application which prepares to shut down the phone-module.
6.
The application shuts down, disabling MODULE_PWR_EN_B.
7.
The application disables the two power supplies (optional).
