N27 Hardware User Guide
Chapter 4 Application Interfaces
Copyright © Neoway Technology Co., Ltd. All rights reserved.
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4.6 Other Interfaces
Signal
Pin
I/O
Function
Remarks
ADC4
1
20
AI
Analog-Digital Converter interface
Software (open) version:
used as ADC4.
ADC2
1
21
AI
Analog-Digital Converter interface
Software (open) version:
used as ADC2.
USB_BOOT
33
DI
Forcible download control
STATUS
56
DO
Indication signal of module ON/OFF
NET_LIGHT
57
DO
Indication signal of network status
4.6.1 ADC
The module provides two ADC channels, and the input voltage ranges from 0.1 V to 1.7 V. The ADC
pins support a resolution of 15 bit and it can be used for temperature detection and other checks.
For details about ADC commands, see
Neoway_N27_AT_Command_Manual
.
4.6.2 USB_BOOT
USB_BOOT is the pin to forcibly enter download mode. Connect USB_BOOT to VDDIO_1P8 through
a pull-up resistor before the module is started, and the module will enter forcible download mode. In
this mode, the firmware of the module can be upgraded. Reserve this pin to facilitate firmware upgrade
and debugging.
Add an ESD component to protect USB_BOOT.
Figure 4-26 Reference design of USB_BOOT
10k
Ω
VDDIP_1P8
USB_BOOT
4.6.3 STATUS
This pin outputs 1.8V high level to control the startup indicator after the module is started successfully.
