Specifications

L506 Hardware Design

3.9 Power on/off and reset interface

3.9.1 Pin definition

L506 can be powered on by pulling PWRKEY pin down to ground. This pin is already internal pulled

up to 1.8V in module, so external pull-up resistor is not necessary. Placing an ESD protection diode

close to the PWRKEY pin is strongly recommended. Please refer to the following figure for

recommended reference circuitL506 also have a RESET pin to reset module. This function is used as

an emergency reset only when AT command “AT+CPOF” has no effect. User can pull RESET pin to

ground, then module will reset. Placing an ESD protection diode close to the RESET pin is strongly

recommended. Please refer to the following figure for recommended reference circuit, you can

pull-down this pin to ground and hold about 150us and then release will force the module enter reset

state.

Table 3-15power on/off and reset key define

Pin No.

Net name

I/O Typ.

descriptions

PWRKEY

L506 power on/off pin(internal pull-up to

1.8V)

RESET

L506 RESET pin(internal pull-up to 1.8V)

Note: Due to the internal partial pressure, the actual measured value of the user is about 0.8v.

3.9.2 Power on sequence

Table 3-16 power on timing chart.

Ton

Power on low level pulse

115

150

Ton(status)

Power on time(According to the

STATUS pin judgment)

2.76

Ton(uart)

Power on time (according the UART

pin judgement)

2.5

VIH

Input high level voltage of

PWRKEY pin

1.17

1.8

2.1

VIL

Input low level voltage of PWRKEY

-0.3

0.3