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EVAL-AD7879EBZ Datasheet(PDF) 1 Page - Analog Devices |
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EVAL-AD7879EBZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 36 page Low Voltage Controller for Touch Screens AD7879 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved. FEATURES 4-wire touch screen interface 1.6 V to 3.6 V operation Median and averaging filter to reduce noise Automatic conversion sequencer and timer User-programmable conversion parameters Auxiliary analog input/battery monitor (0.5 V to 5 V) 1 optional GPIO Interrupt outputs (INT, PENIRQ) Touch-pressure measurement Wake-up on touch function Shutdown mode: 6 μA maximum 12-ball, 1.6 mm × 2 mm WLCSP 16-lead, 4 mm × 4 mm LFCSP APPLICATIONS Personal digital assistants Smart hand-held devices Touch screen monitors Point-of-sale terminals Medical devices Cell phones FUNCTIONAL BLOCK DIAGRAM REF+ X– Y– X+ Y+ RESULT REGISTERS CONTROL REGISTERS SEQUENCER AND TIMER REF– TEMPERATURE SENSOR TO RESULT REGISTERS AD7879/ AD7879-1 VCC/REF X+ X– Y+ Y– GND SERIAL PORT DIN/ ADD1 DOUT/ SDA SCL CS/ ADD0 12-BIT SAR ADC REF– Figure 1. GENERAL DESCRIPTION The AD7879 is a 12-bit successive approximation analog-to- digital converter (ADC) with a synchronous serial interface and low on-resistance switches for driving 4-wire resistive touch screens. The AD7879 works with a very low power supply (a single 1.6 V to 3.6 V) and features throughput rates of 105 kSPS. The device includes a shutdown mode that reduces its current consumption to less than 6 μA. To reduce the effects of noise from LCDs and other sources, the AD7879 contains a preprocessing block. The preprocessing function consists of a median and an averaging filter. The com- bination of these two techniques provides a more robust solution, discarding the spurious noise in the signal and keeping only the data of interest. The size of both filters is programmable. Other user-programmable conversion controls include variable acquisition time and first conversion delay; up to 16 averages can be taken per conversion. The AD7879 can run in either slave or standalone mode, using an automatic conversion sequencer and timer. The AD7879 has a programmable pin that can operate as an auxiliary input to the ADC, as a battery monitor, or as a GPIO. There is also a programmable interrupt output that can operate in three modes: as a general-purpose interrupt to signal when new data is available INT, as an interrupt to indicate when limits are exceeded, or as a pen-down interrupt when the screen is touched (PENIRQ). The AD7879 offers temperature measure- ment and touch-pressure measurement. The AD7879 is available in a 12-ball, 1.6 mm × 2 mm WLCSP and in a 16-lead, 4 mm × 4 mm LFCSP. The part also has either an SPI (AD7879) or I2C (AD7879-1) interface. |
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