N27 Hardware User Guide
Chapter 4 Application Interfaces
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Place noise-sensitive circuits such as audio and RF far away from power supply circuits,
especially when the DC-DC is adopted in the design.
Connect GND pins and bottom pads to the ground to optimize heat sink and separate noise.
4.1.2 VDDIO_1P8
N27 provides one VDDIO_1P8 pin that outputs 1.8V@50mA.
VDDIO_1P8 is enabled automatically when the module is awake or in a running state.
It is recommended that VDDIO_1P8 is used for level shift only and a TVS diode should be added.
4.2 Control Interfaces
Signal
Pin
I/O
Function
Remarks
PWRKEY_N
52
DI
ON/OFF control and PSM wakeup
Triggered by a low level
4.2.1 PWRKEY_N
PWRKEY_N supports only the following two startup control methods. Perform operations based on the
instructions in this hardware user guide.
N27
allows startup by the following controls:
Button
MCU
Figure 4-2 Reference design of startup controlled by button
ESD
N27 module
PWRKEY_N
S1
