N715-EA Hardware User Guide
Chapter 5 Application Interfaces
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For the main power circuit of the module, the PCB routing width must ensure that the 2.5 A
current can be passed safely, and there should be no obvious loop voltage drop. Keep the PCB
trace width be at least 2.5 mm and ensure that the ground plane of the power supply part is as
complete as possible. In addition, try to make the power cable short and thick.
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Noise-sensitive circuits, such as audio circuits and RF circuits, should be kept away from power
circuits, especially when the DC-DC power supply is used.
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The voltage frequency of the SW pin of the DC-DC power supply is high, and the loop should be
minimized. Keep sensitive components far away from the SW pin of the DC-DC component to
prevent noise coupling. Place feedback components as close as possible to the FB pin.
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The GND pin and bottom pad of the chip must be grounded to ensure good heat dissipation and
noise isolation.
5.1.2 VDD_1P8
VDD_1P8 power is on normally and cannot be turned off even when the module is in sleep mode. Connecting
the module to an external circuit will increase its power consumption in sleep module. It is recommended that
VDD_1P8 is used for voltage-level translation only and an ESD protector should be added.
N715-EA provides one VDD_1P8 output. It can provide the 1.8 V voltage and the maximum output
current is 50 mA.
5.2 Control Interfaces
5.2.1 Power-on
Table 5-1 Module power-on descriptions
A long press of the power
button for over 2s can switch
off the module.
When the module is in power-on
mode, do not directly disconnect the
power supply of the module;
otherwise, the flash memory (Flash)
inside the module may be damaged.
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