FM7843
Overview
Instruction
FM7843 is a 4-wire resistive touch screen input controller integrated circuit. The device is a 12-bit analog-to-digital converter with a synchronous serial interface and touch screen driving circuit. It has a shutdown mode, in which the power dissipation of the device is as low as 0.5µW. Fully patible with Burr-Brown’ ADS7843, this device is ideal to be used in personal digital assistant (PDA) and portable instruments applications.
Features
Realizing the driver selection of touch screen Analog-to-digital conversion on input voltage or auxiliary voltage Synchronous serial interface Up to 125k Hz conversion rate Programmable 8-bit or 12-bit resolution Single supply: 2.7V to 5V 2 auxiliary analog inputs
Block Diagram
FM7843 Touch Screen Controller
Ver1.0
Specification 3
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Pin Assignment
Pin Description
Symbol Vcc X+ Y+ XYGND IN3 IN4 Vref Vcc PENIRQ DOUT BUSY DIN CS DCLK Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Power supply 2.7v to 5v X+...
