PDF MK715 Data sheet ( Hoja de datos )

Número de pieza	MK715
Descripción	Touch Screen Controller
Fabricantes	Integrated Circuit Systems
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No Preview Available ! MK715 Touch Screen Controller General Description The MK715 Touch Screen Controller IC provides all the screen drive, Analog to Digital converter (ADC) and control circuits to easily interface to 4-wire analog resistive touch screens. It also includes a general purpose A to D converter and a clock synthesizer. The IC continually monitors the screen waiting for a touch. In this mode, the supply current is typically 4µA. When the screen is touched, the IC performs analog to digital conversions to determine the location of the touch, stores the X and Y locations in the registers, and issues an interrupt. This process is repeated up to 303 times per second until no further screen touches are detected, at which time the low current mode is resumed. The device has a general purpose input into the 10-bit ADC, allowing for the measurement of other inputs such as battery voltage. The MK715 can be powered from a 3.3V supply, and uses an inexpensive 32.768kHz watch crystal as the input reference. An internal Phase-Lock Loop clock synthesizer provides the high speed clock for the ADC, and the option to have a clock output to drive other digital chips in the system. The tiny package is the same body size as the 14 pin SOIC, with 25 mil spacings on the leads. Features Tiny 20 pin SSOP (150 mil body) 4 microamp standby current Less than 3mA active current at 3.3V, including screen drive Touch pressure can be measured One or two general purpose A to D inputs On-chip voltage reference 32.768kHz crystal/clock input MHz clock outputs available Operates with four wire touch screens Ratiometric conversion eliminates screen calibration Automatic wake up upon screen touch Programmable conversion rate to a maximum of 303 points per second 3.3V or 5V supply (2.7V version available) 10 bit A/D converter Full powerdown control Touch screen is directly driven - no external transistors are required A to D Converter guaranteed monotonic 3 or 4 wire serial interface Applications Pin Assignment Notebook Computers Handheld Computers PDAs Touch-screen kiosks SK D0 DI TOUCH# XH XL YH YL PL GP 1 2 3 4 5 6 7 8 9 10 20 CS 19 CLKOUT 18 INT 17 VDD 16 X2 15 X1 14 GND 13 CAP2 12 CAP1 11 CAP3 MK715 20 pin SSOP MK715RevD020200 ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate. 1 page IC Operation (Periodic Conversions Enabled) Power ON N Is screen touched? Y Write D6 Reg 0 to 1 and TOUCH# = 0 Issue Interrupt, power-up ADC and PLL Convert Y co-ordinates Store Y co-ordinates in Register 2 Write D7 register 0 to 1 Issue interrupt Is screen touched? N Y Convert X co-ordinates Store X co-ordinates in Register 2 Write D7 register 0 to 1 Issue Interrupt Wait. Duration controlled by Rate Register Y Is screen touched? N Write D6 Reg 0 to 0 and TOUCH# = 1 Issue Interrupt, power-down ADC and PLL 5 MK715 5 Page MK715 Clock Control X1 32.768kHz X2 PD DIS32 PD To A-D Converter ENPLL Phase Locked / 8 3 CLOCKMHZ /4 2 1 /2 1 14.3196 or SEL2 CLKSEL SEL0, SEL1 CLKOUT INT 1 INT Clock Selection Tables TOUCH# SEL3 1 TOUCH# SEL4 SEL2 0 0 0 0 1 1 1 1 PD ENPLL 0x 0x 1x 1x 00 01 10 11 DIS32 0 1 0 1 x x x x CLKOUT FREQ 32.768 32.768 32.768 OFF MHZ MHZ OFF OFF NOTES Power-up State Runs only when screen touched Always Running CKSEL 0 0 0 0 1 1 1 1 SEL1 0 0 1 1 0 0 1 1 SEL0 0 1 0 1 0 1 0 1 CLOCKMHZ 14.3196 7.160 3.580 1.790 14.7456 7.3728 3.6864 1.8432 SEL2 0 1 CLOCKOUT 32.768 kHz CLOCKMHZ SEL4 0 1 SEL3 0 1 INT INT CLOCKMHZ TOUCH# TOUCH# CLOCKMHZ Clocks may be programmed to be on any of three pins per the description above. The clocks are controlled by the following register bits (see register description for more details): STATUS register, bits 2 and 3; and CONTROL register bits 0, 1, 2, 3, 4, 5, 7. 11 11 Page

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