Datasheet > AD7889-1ACBZ-RL

AD7889-1ACBZ-RL

更新时间： 2024-11-16 20:52:23

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AD7889-1ACBZ-RL 数据手册

Low Voltage Controller for Touch Screens

Data Sheet

AD7879/AD7889

FEATURES

FUNCTIONAL BLOCK DIAGRAM

/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

AD7889/

AD7889-1

CONTROL

REGISTERS

APPLICATIONS

Personal digital assistants

Smart handheld 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/AD7889 are 12-bit successive approximation

analog-to-digital converters (SAR ADCs) with a synchronous

serial interface and low on-resistance switches for driving 4-wire

resistive touch screens. The AD7879/AD7889 work with a very

low power supply—a single 1.6 V to 3.6 V supply—and feature a

throughput rate of 105 kSPS. The devices include a shutdown

mode that reduces current consumption to less than 6 μA.

The AD7879/AD7889 have a programmable pin that can

operate as an auxiliary input to the ADCs, as a battery monitor,

or as a general-purpose input/output (GPIO). In addition, a

programmable interrupt output can operate in three modes: as a

general-purpose interrupt to signal when new data is available

DAV

INT

PENIRQ

(

), as an interrupt to indicate when limits are exceeded

), or as a pen-down interrupt when the screen is touched

). The AD7879/AD7889 offer temperature

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

AD7879/AD7889 contain a preprocessing block. The

measurement and touch pressure measurement.

preprocessing function consists of a median filter and an

averaging filter. The combination of these two filters 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/AD7889

can run in slave mode or standalone (master) 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 AD7889 is available

in a backside coated version of the WLCSP. Both devices support

an SPI interface (AD7879/AD7889) or an I²C interface (AD7879-1/

AD7889-1).

Note that throughout this data sheet, multifunction pins, such

, are referred to either by the entire pin

PENIRQ INT DAV

name or by a single function of the pin, for example,

when only that function is relevant.

PENIRQ

Rev. D

Document Feedback

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.

Technical Support

www.analog.com

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AD7889-1ACBZ-RL 替代型号

型号	品牌	替代类型	描述	数据表
AD7889ACBZ-RL	ADI	完全替代	Low Voltage Controller for Touch Screens
AD7889-1ACBZ-RL7	ADI	完全替代	Low Voltage Controller for Touch Screens
AD7889ACBZ-500R7	ADI	类似代替	Low Voltage Controller for Touch Screens

与AD7889-1ACBZ-RL相关器件

型号	品牌	获取价格	描述	数据表
AD7889-1ACBZ-RL7	ADI	获取价格	Low Voltage Controller for Touch Screens
AD7889ACBZ-500R7	ADI	获取价格	Low Voltage Controller for Touch Screens
AD7889ACBZ-RL	ADI	获取价格	Low Voltage Controller for Touch Screens
AD7889ARS-1	ADI	获取价格	IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Dig
AD7889ARS-2	ADI	获取价格	IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Dig
AD7889ARS-3	ADI	获取价格	IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Dig
AD7889BRS-1	ADI	获取价格	IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Dig
AD7890	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890_17	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890AN	ETC	获取价格	MICROCIRCUIT, LINEAR, 8-CHANNEL, 12-BIT SERIAL, DATA ACQUISITION SYSTEM, MONOLITHIC SILICO

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