User's Manual

720 Hardware User Guide

2.6 GPIO

N720supports UART. You can configure the GPIO to meet your requirements for connecting to

different devices. For the open multi-function GPIO interface, please inquiry our technical support

engineers. The level of the module interface is 1.8 V. Table 2-3lists GPIO pins.

Table 2-3 GPIO

Name Pin I/O Function Remarks

UART2_TXD 46 DO UART data transmit

Data communication

UART2_RXD 47 DI UART data receive

UART2_CTS 51 DI Clear to send

UART2_RTS 52 DO Request to send

ADC2 88 AI ADC2input

16-bit, detectable voltage

range: 0.1 V to 1.7 V

ADC1 89 AI ADC1input

NET_LIGHT 83 DO Indicate network status

DTR 79 DI Sleep mode control

RING 13 DO Incoming call ring

1.1.1 UART

N720 provides one group of UART interfaces, which support hardware flow control and 4Mbps at

most. The high level is 1.8V. Figure 2-17 shows the reference design of the UART interface.