Data sheet, Pin description – Diodes AP389X User Manual

Page 5

Data Sheet

Enhanced Multi-touch Capacitive Touch Screen Controller AP389X

Apr. 2013 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

Pin Description

Pin Number

Pin Name

Pin

Type

Pin Function

QFN-56
AP3890

QFN-68

AP3891 AP3892

1 1 1

P1.7/

TXD1/

PINT0.1/

EXTCLKIN/

I/O

Port 1.7 GPIO

8051 P1.7 GPIO

TXD1

This pin also can be configured as TXD of
UART 1

PINT0.1

This pin also can be configured as the
expanded INT0 interrupt

External Clock Input

External clock input source.

T0 Timer 0 Input

This pin also can be configured as Timer 0
input

2 2 2

TESTEN I

Test Mode Enable High Active

This pin has an internal weakly pull low
resistor connected. If it is connected high, the
chip enters into Test Mode condition

3 3 3

P1.2/SDA

(open-drain)

I/O

Port 1.2 GPIO

8051 P1.2 GPIO

SDA

This pin also can be configured as the SDA
signal of the I2C master or I2C slave controller.
In this operation mode, this pin should also be
configured as bi-directional I/O with
open-drain output

4 4 4

P1.3/SCL

(open-drain)

I/O

Port 1.3 GPIO

8051 P1.3 GPIO

SCL

This pin also can be configured as the SCL
signal of the I

C master or I

C slave controller.

In I

C master mode, this pin should be

configured as open-drain output. In I

C slave,

this pin should be configured as input only

5 5 5 RSTN I

Reset Low Active

Typically connect a resistor to VDD18 and a
capacitor to VSS
Low asserted and threshold at 0.5×V

DD18

. When

forced low, the chip enters into reset condition
This pin should not be connected to any level
above V

DD18