Data Sheet
Enhanced Multi-touch Capacitive Touch Screen Controller
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.
AP389X
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
Power-down
Standard
Description
No scan with power-down mode
Higher scan rate when fingers are
on panel, IOSC can up to 4MHz
to 48MHz
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
•
•
•
•
•
Applications
•
•
•
Mobile Phones
Personal Digital Assistants
Smart Hand-held or Gaming Devices
QFN-7×7-56
Figure 1. Package Types of AP389X
QFN-8×8-68
Apr. 2013
Rev. 1. 0
1
BCD Semiconductor Manufacturing Limited
Data Sheet
Enhanced Multi-touch Capacitive Touch Screen Controller
Pin Description
Pin Number
QFN-56
AP3890
QFN-68
AP3891
AP3892
AP389X
Pin Name
Pin
Type
Port 1.7 GPIO
Pin Function
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
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
Port 1.2 GPIO
8051 P1.2 GPIO
3
3
3
P1.2/SDA
(open-drain)
I/O
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
Port 1.3 GPIO
8051 P1.3 GPIO
4
4
4
P1.3/SCL
(open-drain)
I/O
SCL
This pin also can be configured as the SCL
signal of the I
2
C master or I
2
C slave controller.
In I
2
C master mode, this pin should be
configured as open-drain output. In I
2
C slave,
this pin should be configured as input only
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
1
1
1
P1.7/
TXD1/
PINT0.1/
EXTCLKIN/
T0
I/O
2
2
2
TESTEN
I
5
5
5
RSTN
I
Apr. 2013
Rev. 1. 0
5
BCD Semiconductor Manufacturing Limited
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