Datasheet > EVAL-AD7879EBZ

EVAL-AD7879EBZ

更新时间： 2024-11-24 06:58:07

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
36页	526K
描述
Low Voltage Controller for Touch Screens

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EVAL-AD7879EBZ 数据手册

Low Voltage Controller for Touch Screens

AD7879

FUNCTIONAL BLOCK DIAGRAM

FEATURES

/REF

4-wire touch screen interface

1.6 V to 3.6 V operation

X– Y– X+ Y+

Median and averaging filter to reduce noise

Automatic conversion sequencer and timer

User-programmable conversion parameters

Auxiliary analog input/battery monitor (0.5 V to 5 V)

1 optional GPIO

X+

X–

REF–

REF+

Y+

Y–

Interrupt outputs (INT, PENIRQ)

Touch-pressure measurement

Wake-up on touch function

12-BIT

SAR ADC

RESULT

REGISTERS

GND

TEMPERATURE

SENSOR

Shutdown mode: 6 μA maximum

12-ball, 1.6 mm × 2 mm WLCSP

16-lead, 4 mm × 4 mm LFCSP

AD7879/

AD7879-1

CONTROL

REGISTERS

APPLICATIONS

Personal digital assistants

Smart hand-held devices

Touch screen monitors

Point-of-sale terminals

Medical devices

SEQUENCER

AND TIMER

SERIAL PORT

RESULT

REGISTERS

CS/

DIN/ DOUT/ SCL

ADD0 ADD1 SDA

Cell phones

Figure 1.

GENERAL DESCRIPTION

The AD7879 is a 12-bit successive approximation analog-to-

digital converter (ADC) with a synchronous serial interface and

low on-resistance switches for driving 4-wire resistive touch

screens. The AD7879 works with a very low power supply (a

single 1.6 V to 3.6 V) and features throughput rates of 105 kSPS.

The AD7879 has a programmable pin that can operate as an

auxiliary input to the ADC, as a battery monitor, or as a GPIO.

There is also a programmable interrupt output that can operate

in three modes: as a general-purpose interrupt to signal when

INT

new data is available

, as an interrupt to indicate when limits

are exceeded, or as a pen-down interrupt when the screen is

PENIRQ

ment and touch-pressure measurement.

The device includes a shutdown mode that reduces its current

consumption to less than 6 μA.

touched (

). The AD7879 offers temperature measure-

To reduce the effects of noise from LCDs and other sources,

the AD7879 contains a preprocessing block. The preprocessing

function consists of a median and an averaging filter. The com-

bination of these two techniques provides a more robust solution,

discarding the spurious noise in the signal and keeping only

the data of interest. The size of both filters is programmable.

Other user-programmable conversion controls include variable

acquisition time and first conversion delay; up to 16 averages

can be taken per conversion. The AD7879 can run in either

slave or standalone mode, using an automatic conversion

sequencer and timer.

The AD7879 is available in a 12-ball, 1.6 mm × 2 mm WLCSP

and in a 16-lead, 4 mm × 4 mm LFCSP. The part also has either

an SPI (AD7879) or I²C (AD7879-1) interface.

Rev. 0

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 registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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与EVAL-AD7879EBZ相关器件

型号	品牌	获取价格	描述	数据表
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
EVAL-AD7899CB	ADI	获取价格	Evaluation Board for 5V, 12-Bit, Serial 220kSPS ADC in 8-Pin Package
EVAL-AD7910CB	ADI	获取价格	250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70

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