Figure 4-2 Power Reference Circuit; Table 4-1 Voltage Characteristics - Zte MG2639_V3 User Manual

Module hardware design

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Table Of Contents

Table of Contents

输入电压

10K

10uF



Power design

MG2639_V3 module is powered by VBAT. If the external power cannot be stably started, it's

recommended to add buffer circuit in the circuit. See the module's required voltage characteristics in

table 4-1.

Classification

Input voltage

Input current

The module is very strict with the requirements on the power supply and grounding:

(1). The filtering must be performed on the power and grounding, and the power ripple must be

controlled under 50Mv. Do not power any other part in the system because it might affect the RF

performance.

(2). Select the power cables with at least 80mil traces during the layout and keep the integrality

of ground line.

(3). Make sure the Max. instantaneous output current is larger than 2A if the Max. input current

is very high.



Power on

The module is under power-off status after it's normally powered on. To turn on the module,

provide a 2s-5s low level pulse to the PWRKEY_N PIN. If one 1K resistance is connected with the

PWRKEY_N PIN, the module can be automatically powered on after connected to the power supply.



Power off

To turn off the module, use AT command "AT+ZPWROFF" or provide a 2s~5s low level pulse to

the PWRKEY_N PIN.



Reset

Use the above method to firstly "power-off" and then "power-on" to hard reset the module.

If the external reset function has to be used, provide a low level pulse lasting at least 500ms to the

SYSRST_N PIN within 2 seconds after the module is turned on. Before that, the external MCU_RESET

signal must be kept at low level. See the reset circuit design in figure 4-1.

Suspend the SYSRST_N PIN if not used.

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