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| 型號(hào)： | EVAL-AD7877EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Touch Screen Controller |
| 中文描述： | 觸摸屏控制器 |
| 文件頁(yè)數(shù)： | 1/44頁(yè) |
| 文件大?。?/td> | 1002K |
| 代理商： | EVAL-AD7877EB |
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Touch Screen Controller
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, V
CC
of 2.7 V to 5.25 V
Separate V
DRIVE
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
GENERAL DESCRIPTION
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.
Tel: 781.329.4700Fax: 781.326.8703
FUNCTIONAL BLOCK DIAGRAM 19
DIN
26
DCLK
27
DOUT
28
V
DRIVE
18
CS
23
DAV
CONTROL LOGIC AND SERIAL PORT
REDAC
CONTROL
REGPIO
ALERT STATUS/
RELIMIT
COLIMIT
RESULTS
SEQUENCER
DAC
29
ARNG
30
AOUT
4
AUX3/GPIO3
5
AUX2/GPIO2
6
AUX1/GPIO1
31
V
REF
AND WAKE-UP
ON TOUCH
17
PENIRQ
LOGIC
22
ALERT
ACQ
LOGIC
20
STOPACQ
14
AGND
15
DGND
21
GPIO4
REF
BUF
GTO
A
W12-BIT SUCCESSIVE
CLOCK
9 I/P
MUX
TESENSOR
2
BAT2
BATTERY
3
BAT1
BATTERY
11
Y–
13
Y+
10
X–
12
X+
7
V
CC
REF–
IN
REF+
DMUX
X– Y– GND X+ Y+ V
REF
AD7877
0
Figure 1.
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
+V
CC
, while the analog input range is from 0 V to V
REF
. 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7877EBZ | 功能描述:BOARD EVALUATION FOR AD7877 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| EVAL-AD7879-1EBZ | 功能描述:BOARD EVALUATION FOR AD7879-1 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| EVAL-AD7879EBZ | 功能描述:BOARD EVALUATION FOR AD7879 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電信，線路接口單元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要屬性:T1/J1/E1 LIU 次要屬性:- 已供物品:板，電源，線纜，CD 其它名稱:82EBV2081 |
| EVAL-AD7887CB | 制造商:Analog Devices 功能描述:EVAL BD FOR 2.7 V TO 5.25 V, MICROPWR, 2CH, 125 KSPS, 12-BIT - Bulk |
| EVAL-AD7887CB4 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP |
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