N11
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
8
3
Application Interfaces
N11 provides power supply and control, communications, RF, and other interfaces to meet customers
requirements in different application scenarios.
This chapter describes how to design each interface and provides reference designs and guidelines.
3.1
Power Supply
Schematic design and PCB layout of power supply are the most critical process in application design
and determine the performance of customers' applications. Please read the design guidelines of
power supply and comply with the correct design principles to obtain the optimal circuit performance.
Table 3-1
Power supply and switch interface
Pin
Signal
I/O
Function
Remarks
2, 3, 4
VBAT
P
Main power supply input
3.4 V to 4.3 V (3.9 V is recommended)
1, 4, 10, 19
GND
P
Ground
5
ON/OFF
DI
ON/OFF input
Low-level triggers ON/OFF state.
3.1.2
VBAT
The power supply design consists of two parts: schematic design and PCB layout.
Schematic Design
Design the circuit of the power supply for N11 based on the input voltage you choose. Generally
there are three types of input voltages:
⚫
3.4 V to 4.3 V (3.9 V typically, output by cellphone battery)
⚫
4.3 V to 5.5 V (5.0 V typically, output by computer through USB)
⚫
5.5 V to 24 V (12 V typically, output by automotive battery)
Figure 3-1 shows schematic design recommended for 3.4 V to 4.3 V input.
