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Diodes AP389X User Manual

Data sheet, General description, Features

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Data Sheet

Enhanced Multi-touch Capacitive Touch Screen Controller AP389X

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

1

General Description

The AP389X is a low-cost high-resolution single chip
solution for APA capacitive touch screen. It is an
8-bit single cycle 8051 microcontroller with I

2

C

Interface. The chip includes 8-bit successive
approximation analog-to-digital converters with an
I

2

C interface and multiplexer-switcher circuits for

flexible measurement of analog signal from APA
panel. An accurate switched-capacitor integrator is
built-in and it can auto calibrate the pixel parameters
for a wide range of capacitance on the touch screen
(0.1pF to 4pF). On-chip capacitor can replace
external component. This touch screen controller
(TSC) with CMOS integration circuit provides an
ideal choice for APA touch panel. The AP389X is
specified over the temperature range of -40°C to
95°C.

The AP389X is available in QFN-7×7-56 (for
AP3890) and QFN-8×8-68 (for AP3891 and AP3892)
packages.

Features


Mutual Capacitive Touch Sensing

• Dual Power Supply: 2.8V to 3.6V Operation

Voltage; 1.6V to 2.0V Operation Voltage

Up to 30/38/36 Drive Lines and 17/22/23 Sense

Lines

• Dedicated Internal Two-wire Serial Control Bus

I

2

C and UART between AP389X and Host

Single-end Integrator with Programmable Gain

Control and Offset Control

• Multiplexed Analog Digitization with Two 8-bit

Resolution Odd/Even Scan SAR ADCs and Its
Dedicated 2X to 8X Accumulator XSRAM
Buffers







Features (Continued)

Single Cycle 8051 CPU Core, Maximum Opera-

ting Clock up to 24MHz from IOSC (Zero Wait
State); 48MHz from IOSC(With Wait State)

4MHz to 48MHz Internal Oscillator (IOSC)
64K-byte Flash ROM
256-byte Internal SRAM and 12032-byte
XSRAM
Extra XSRAMs for AFE:

896×12-bit×2 XSRAM for 8-bit SAR ADC

896×8-bit XSRAM for 8-bit Parasitical
Capacitor Compensator

Two 16-bit Timers T0/T1 and One 16-bit ECT
Timer T2
One I

2

C Slave Controller and One I

2

C Master

Controller Shared with the Same Port

With Asynchronous I

2

C Slave Address

Detection Logic Design

4 General Purpose GPIO Pins
One External Interrupt Pin
One UART Data Transfer Output Pin

• ISP/IAP via I²C Port
• Operation Temperature Range: -40°C to 95°C
• Package Types: QFN-7×7-56 and QFN-8×8-68
• RoHS Compliance
• Operating Mode:

Mode Description

Power-down

No scan with power-down mode

Standard

Higher scan rate when fingers are
on panel, IOSC can up to 4MHz
to 48MHz


Applications

• Mobile Phones
• Personal Digital Assistants
• Smart Hand-held or Gaming Devices









Figure 1. Package Types of AP389X

QFN-7×7-56

QFN-8Ч8-68