SS7646 Datasheet | Silicon Standard

SS7646 Touch Screen Controller Features Pin patible 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 125k Hz Full power-down control 16 pin SSOP package 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-patible 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 plete 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 APPLICATIONS Touch-screen Monitors Personal Digital Assistants Point-of-Sale Terminals Pagers High-Speed Data Acquisition Portable Instruments Low-power Instruments reference OFF) at a sample rate of 125k Hz 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. .Data Sheet.net/ ORDERING INFORMATION PIN CONFIGURATION X+ DCLK /CS SS7646TR SS7646 in SSOP-16 shipped on tape and reel Y+ BUSY DOUT XY- /PENIRQ VBAT VIN VREF SSOP-16 8/21/2004...