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AD7877ACP-REEL7 датащи(PDF) 1 Page - Analog Devices |
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AD7877ACP-REEL7 датащи(HTML) 1 Page - Analog Devices |
1 / 44 page Touch Screen Controller AD7877 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. 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 x 5 mm package 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 I/P 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 2.2V), 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 can be varied from 1 V to +VCC, while the analog input range is from 0 V to VREF. The device includes a shutdown mode, which 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 can be 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 backlight or contrast control. The AD7877 can run 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). |
Аналогичный номер детали - AD7877ACP-REEL7 |
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Аналогичное описание - AD7877ACP-REEL7 |
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