4D SYSTEMS

uLCD-70DT Display Module

© 2014 4D SYSTEMS

Page 5 of 22

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3. Pin Configuration and Summary

Continued overleaf…

I = Input, O = Output, P = Power

H1 Pinout (Programming Header)

Pin

Symbol

I/O

Description

1

+5V IN

P

Main Voltage Supply +ve input pin. Reverse polarity protected. Range is 4.0V to

5.5V, nominal 5.0V. 500mA minimum Required.

2

N/C

-

No Connect – Leave this pin unconnected

3

TX

O

Asynchronous Serial Transmit pin, TTL level. Connect this pin to the Receive (Rx)

signal of other serial devices. Used in conjunction with the RX pin for

programming this microLCD. 5.0V Tolerant Pin. Connected to TX0 via Resistor.

4

N/C

-

No Connect – Leave this pin unconnected

5

RX

I

Asynchronous Serial Receive pin, TTL level. Connect this pin to the Transmit (Tx)

signal of other serial devices. Used in conjunction with the TX pin for

programming this microLCD. 5.0V Tolerant Pin. Connected to RX0 via Resistor.

6

N/C

No Connect – Leave this pin unconnected

7

GND

P

Supply Ground

8

N/C

-

No Connect – Leave this pin unconnected

9

RESET

I

Master Reset signal. Internally pulled up to 3.3V via a 10K resistor. An active Low

pulse greater than 2 micro-seconds will reset the module. If the module needs

to be reset externally, only use open collector type circuits. This pin is not driven

low by any internal conditions. The host should control this pin via one of its

port pins using an open collector/drain arrangement.

10

N/C

-

No Connect – Leave this pin unconnected