User's Manual

720 Hardware User Guide

2.3 Power Control Interfaces

Name Pin I/O Function Remarks

VABT

17/18/1

Main power supply

input

3.3 V to 4.3 V (TYP: 3.8 V )

VDDIO_1P8 45 P

1.8 V power supply

output

Supply power for IO level shifting

circuit.

Load capability: <100 mA

Advise to add ESD to protect while

using.

RESET 32 DI Reset input Low level

PON_TRIG 34 DI PON_TRIG High level triggers the ON status

PWRKEY 33 DI Power ON/OFF Low level triggers the ON status

2.3.1 VBAT

VBAT is the power supply input pin of the module. Its input voltage ranges from 3.3 V to 4.3 V and

the preferable value is 3.8V. In addition to baseband, it supplies power for RF power amplifier.

The performance of the VBAT power supply is a critical path to module's performance and

stability. The peak input current at the VBAT pin can be up to3A when the signal is weak and the

module works at the maximum transmitting power. The voltage will encounter a drop in such a

situation. The module might restart if the voltage drops lower than 3.3 V.