User's Manual

page 35/51
HiAll
NC
User Manual 2012/06/28
6. POWER MANAGEMENT
VBAT Input voltage shall be in the range 3.3V to 4.5V.
6.1 POWER MODES
Depending on the status of the HiAll
NC
, different power consumption modes can be identified.

Communication mode (with or without GPS running)
All systems on HiAll
NC
are active. In this mode, the module is registered to the network and a voice/data call is
actively transmitting data.

Idle mode (with or without GPS running)
In this mode, the module is registered to the network but it is idle/ paging only. No voice/ data call connection is
established. AT commands can be send and GPS can run.

Sleep mode (without GPS running)
In this mode, the module is registered to the network but it is idle/ paging only. No voice/data call connection is
established. AT commands can not be send.

Flight mode (with or without GPS running)
The processor is still active but the radio section is powered down. This mode can be controlled by sending an
AT command to the module.
6.2 MODULE POWER-UP
6.2.1 Power-up with POK_IN signal
To start the module, first power up VBAT, which must be in the range 3.3V ~ 4.5V, and must be able to supply
1.8A during TX bursts.

POK_IN is a low level active signal internally pulled up to a dedicated power domain of 3V.
As POK_IN is internally pulled up, a simple open collector or open drain transistor must be used for ignition.
Warning: The POK_IN will become low after module is ready. It can not be directly driven by a GPIO
signal.

To start the module, a low level pulse must be applied on POK_IN for 2000ms.

RESET must not be Low during that period of time
After a few seconds, the UART1_RTS enters active state and the module is ready to receive AT commands.

VGPIO is a supply output from the module that can be used to check if the module is active.
• When VGPIO = 0V the module is OFF.
• When VGPIO = 2.8V the module is ON. (It can be in Idle, communication or sleep modes)