SS7646 Datasheet, PDF (1/13 Pages) Silicon Standard Corp. – Touch Screen Controller

SS7646
Touch Screen Controller
FEATURES
Pin compatible with SS7643
Serial interface
Interface for 4-wire touch-screen
Embedded touch-screen drivers
Internal 2.5V reference
Direct battery measurement (0V to 6V)
Touch-pressure measurement
One auxiliary analog input
On-chip temperature sensor
Supply voltage from 2.2V to 5.5V
12-bit analog-to-digital converter
Programmable 8- or 12-bit resolution
Conversion rate up to 125kHz
Full power-down control
16 pin SSOP package
APPLICATIONS
Touch-screen Monitors
Personal Digital Assistants
Point-of-Sale Terminals
Pagers
High-Speed Data Acquisition
Portable Instruments
Low-power Instruments
DESCRIPTION
The SS7646 touch-screen controller IC is an advanced
version of the previous controller, the SS7643.
The SS7646 is a 12-biit SAR analog-to-digital converter
(ADC) with SPI serial interface and low-on resistance
drivers for 4-wire resistive touch screens. The SS7646
is fully pin-compatible with the SS7643.
The SS7646 is a highly-integrated controller for portable
applications using 4-wire resistive touch screens, such
as PDAs, portable instruments, cell phones, etc. The
SS7646 contains all the analog and digital circuitry
necessary to complete a pen request, and features
temperature, battery monitor and touch-pressure
measurements.
The SS7646 also features an internal 2.5V reference
that can be turned ON or OFF independently of the
ADC.
The SS7646 consumes only 405 µW (with the internal
reference OFF) at a sample rate of 125kHz with a 2.7V
supply and consumes less than 2.7 µW in the
shutdown mode. The SS7646 will operate with a
supply down to 2.2V.
The SS7646 is supplied in a very small 16-lead SSOP
package and is guaranteed over the temperature range.
ORDERING INFORMATION
PIN CONFIGURATION
SS7646TR
SS7646 in SSOP-16 shipped on
tape and reel
VDD 1
X+ ²
Y+ ³
X- 4
Y- 5
GND 6
VBAT 7
VIN 8
SS7646
SSOP-16
16 DCLK
15 /CS
14 DIN
13 BUSY
12 DOUT
11 _/PENIRQ
10 _VDD
9 VREF
8/21/2004 Rev.2.01
www.SiliconStandard.com
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