DEV-KIT datasheet(40/53 Pages) ETC1

40 / 53 page

4116369

Rev 9.0

September 04, 2017

Product Technical Specification

Design Guidelines

5.2. Module Switch-Off

AT command AT+CPWROFF enables the user to properly switch the AirPrime HL7548 or HL7588

module off.

AT+CPWROFF

Module is ON

PWR_ON_N

Internal pull-up to

1V8

Module is OFF

VGPIO

2 secs

Figure 9.

Power OFF Sequence for PWR_ON_N, VGPIO

Note:

PWR_ON_N is internally pulled up by 100kΩ to 1.8V.

5.3. Emergency Power OFF

If required, the module can be switched off by controlling the RESET_IN_N pad (pad 11). This must

only be used in emergency situations if the system freezes (not responding to AT commands).

To perform an emergency power off, a low-level pulse must be sent on the RESET_IN_N pad for

20ms while the PWR_ON_N signal is inactive (high level). This action will immediately shut the

HL7548 or HL7588 module down and the registers of the CPU and RAM memory will be reset for the

next power on.

5.4. Sleep Mode Management

5.4.1.

Using UART1

AT command AT+KSLEEP enables sleep mode configuration.

AT+KSLEEP=0

•

The module is active when DTR signal is active (low electrical level).

•

When DTR is deactivated (high electrical level), the module immediately enters sleep mode

after inactivity.

•

On DTR activation (low electrical level), the module wakes up.

Note:

AT+KSLEEP=0 is not available on the HL7548.

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