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AD7877ACP-REEL7 датащи(PDF) 1 Page - Analog Devices

номер детали AD7877ACP-REEL7
подробное описание детали  Touch Screen Controller
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD7877ACP-REEL7 датащи(HTML) 1 Page - Analog Devices

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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).


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