Diodes AUR3852 - Manual

Data Sheet
Enhanced Multi-touch Capacitive Touch Screen Controller AUR3852
Feb. 2013 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1
General Description
The AUR3852 is a low-cost high-resolution single
chip solution for APA capacitive touch screen. It is
an 8-bit single cycle 8051 microcontroller with ICP
Interface. The chip includes a 12-bit successive
approximation analog-to-digital converter 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 AUR3852 is
specified over the temperature range of -40°C to
85°C.
The AUR3852 is available in QFN-6×6-48 and
QFN-7×7-56 packages.
Features
•
1
Mutual Capacitive Touch Sensing
• Single Power Supply: 2.8V to 3.6V Operation
Voltage
•
1
Supports Low Voltage to 1.8V by Built-in 1.8V
to 3.3V Boost Converter
• QFN-6×6-48 Package: Up to 20 Drive Lines and
14 Sense Lines
• 1 QFN-7×7-56 Package: Up to 27 Drive Lines and
15 Sense Lines
•
1
Dedicated Internal Two-wire Serial Control Bus
I 2 C and UART between AUR3852 and Host
•
1
Single-end Integrator with Programmable Gain
Control and Offset Control
•
1
Multiplexed Analog Digitization with 12-bit
Resolution SAR ADC
Features (Continued)
• Single Cycle 8051 CPU Core, Maximum Opera-
ting Clock up to 24MHz from IOSC
2MHz to 24MHz Internal Oscillator (IOSC)
32K-byte Flash ROM
256-byte Internal SRAM and 5888-byte
XSRAM
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
Up to 30 General Purpose GPIO Pins (QFN-56);
25 General Purpose GPIO Pins (QFN-48)
Up to 8 External Interrupt Pins
Up to 2 UART Ports (QFN-56); 1 UART Port
(QFN-48)
• ISP/IAP via I²C/UART Port
(With External Clock I/O Pin Definition for
UART IAP. Pin Shared with P1.7)
• Operation Temperature Range: -40°C to 85°C
• Package Type: QFN-6×6-48 and QFN-7×7-56
• RoHS Compliance
• Operating Mode:
Mode Description
Power-down No scan with power-down mode
Low speed Lower scan rate when finger is not
on panel, IOSC=32kHz
Standard Higher scan rate when fingers are
on panel, IOSC can up to 2MHz
to 24MHz
Applications
• Mobile Phones
• Personal Digital Assistants
• Smart Hand-held or Gaming Devices
Figure 1. Package Types of AUR3852
QFN-6×6-48 QFN-7Ч7-56