Diodes AP389X - Manual

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