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AD7877ACBZ-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD7877ACBZ-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 46 page  Touch Screen Controller Data Sheet AD7877 FEATURES 4-wire touch screen interface LCD noise reduction feature (STOPACQ pin) Automatic conversion sequencer and timer User-programmable conversion parameters On-chip temperature sensor: −40°C to +85°C On-chip 2.5 V reference On-chip 8-bit DAC 3 auxiliary analog inputs 1 dedicated and 3 optional GPIOs 2 direct battery measurement channels (0.5 V to 5 V) 3 interrupt outputs Touch-pressure measurement Wake up on touch function Specified throughput rate of 125 kSPS Single supply, VCC of 2.7 V to 5.25 V Separate VDRIVE level for serial interface Shutdown mode: 1 µA maximum 32-lead, LFCSP, 5 mm × 5 mm package 25-ball,WLCSP, 2.5 mm × 2.8 mm package Qualified for automotive applications APPLICATIONS Personal digital assistants Smart hand-held devices Touch screen monitors Point-of-sale terminals Medical devices Cell phones Pagers FUNCTIONAL BLOCK DIAGRAM 19 DIN 26 DCLK 27 DOUT 28 VDRIVE 18 CS 23 DAV CONTROL LOGIC AND SERIAL PORT DAC REGISTER CONTROL REGISTERS GPIO REGISTERS ALERT STATUS/ MASK REGISTER LIMIT REGISTERS LIMIT COMPARATOR RESULTS REGISTERS SEQUENCER 8-BIT DAC 29 ARNG 30 AOUT 4 AUX3/GPIO3 5 AUX2/GPIO2 6 AUX1/GPIO1 31 VREF PEN INTERRUPT AND WAKE-UP ON TOUCH 17 PENIRQ ALERT LOGIC 22 ALERT STOP ACQ LOGIC 20 STOPACQ 14 AGND 15 DGND 21 GPIO4 2.5V REF BUF TO GPIO1-3 12-BIT SUCCESSIVE APPROXIMATION ADC WITH TRACK-AND-HOLD CLOCK 9 TO 1 INPUT MUX TEMPERATURE SENSOR 2 BAT2 BATTERY MONITOR 3 BAT1 BATTERY MONITOR 11 Y– 13 Y+ 10 X– 12 X+ 7 VCC REF– IN REF+ DUAL 3-1 MUX X– Y– GND X+ Y+ VREF AD7877 Figure 1. GENERAL DESCRIPTION The AD7877 is a 12-bit, successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The AD7877 operates from a single 2.7 V to 5.25 V power supply (functional operation to 2.2 V), and features throughput rates of 125 kSPS. The AD7877 features direct battery measurement on two inputs, temperature and touch-pressure measurement. The AD7877 also has an on-board reference of 2.5 V. When not in use, it can be shut down to conserve power. An external reference can also be applied and varied from 1 V to +VCC, with an analog input range of 0 V to VREF. The device includes a shutdown mode that reduces its current consumption to less than 1 µA. To reduce the effects of noise from LCDs, the acquisition phase of the on-board ADC is controlled via the STOPACQ pin. User- programmable conversion controls include variable acquisition time and first conversion delay. Up to 16 averages can be taken per conversion. There is also an on-board DAC for LCD back- light or contrast control. The AD7877 runs in either slave or master mode using a conversion sequencer and timer. It is ideal for battery-powered systems such as personal digital assistants with resistive touch screens and other portable equipment. The part is available in a 32-lead lead frame chip scale package (LFCSP), and a 25-ball wafer level chip scale package (WLCSP). Rev. E Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2004–2014 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com |
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