Datasheet > EVAL-AD7877EB

EVAL-AD7877EB

更新时间： 2024-11-26 21:53:43

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
44页	1392K
描述
Touch Screen Controller

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中文翻译

获取价格

数据手册

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EVAL-AD7877EB 数据手册

Touch Screen Controller

AD7877

FEATURES

4-wire touch screen interface

FUNCTIONAL BLOCK DIAGRAM

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

AD7877

X+

X–

Y+

Y–

X– Y– GND X+ Y+

REF

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

DUAL 3-1

MUX

AUX1/GPIO1

AUX2/GPIO2

AUX3/GPIO3

REF–

REF+

CLOCK

9 TO 1

I/P

MUX

12-BIT SUCCESSIVE

APPROXIMATION ADC

WITH TRACK-AND-HOLD

BAT1

BATTERY

MONITOR

SEQUENCER

STOP

Touch-pressure measurement

Wake up on touch function

ACQ

STOPACQ

LOGIC

BAT2

RESULTS

REGISTERS

BATTERY

MONITOR

Specified throughput rate of 125 kSPS

Single supply, V_CCof 2.7 V to 5.25 V

Separate V_DRIVElevel for serial interface

Shutdown mode: 1 µA maximum

32-lead LFCSP 5 mm x 5 mm package

LIMIT

AGND

DGND

COMPARATOR

LIMIT

TEMPERATURE

SENSOR

REGISTERS

REF

ALERT STATUS/

MASK REGISTER

ALERT

LOGIC

ALERT

GPIO4

2.5V

REF

BUF

GPIO

REGISTERS

APPLICATIONS

Personal digital assistants

Smart hand-held devices

Touch screen monitors

Point-of-sale terminals

Medical devices

CONTROL

AOUT

ARNG

DAC

GPIO1-3

8-BIT

DAC

REGISTERS

PEN INTERRUPT

AND WAKE-UP

ON TOUCH

CONTROL LOGIC AND SERIAL PORT

PENIRQ

CS DIN DAV DCLK DOUT

DRIVE

Figure 1.

Cell phones

Pagers

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.

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 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.

The part is available in a 32-lead lead frame chip scale package

(LFCSP).

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

Fax: 781.326.8703

www.analog.com

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中文翻译

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与EVAL-AD7877EB相关器件

型号	品牌	获取价格	描述	数据表
EVAL-AD7879-1EBZ	ADI	获取价格	Low Voltage Controller for Touch Screens
EVAL-AD7879EBZ	ADI	获取价格	Low Voltage Controller for Touch Screens
EVAL-AD7887CB	ADI	获取价格	+2.7 V to +5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead uSOIC
EVAL-AD7887CB4	ADI	获取价格	2.7 V to 5.25 V, Micropower, 2-Channel, 125 kSPS, 12-Bit ADC in 8-Lead MSOP
EVAL-AD7888CB	ADI	获取价格	+2.7 V to +5.25 V, Micropower, 8-Channel, 125 kSPS, 12-Bit ADC in 16-Lead TSSOP
EVAL-AD7891-1CB	ADI	获取价格	Evaluation Board for Single Supply, 12-Bit 454 kSPS ADC
EVAL-AD7891-2CB	ADI	获取价格	Evaluation Board for Single Supply, 12-Bit 500 kSPS ADC
EVAL-AD7892-2CB	ADI	获取价格	LC2MOS Single Supply, 12-Bit 600 kSPS ADC
EVAL-AD7892-3CB	ADI	获取价格	LC2MOS Single Supply, 12-Bit 600 kSPS ADC
EVAL-AD7898CB	ADI	获取价格	Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package

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