AD7889-1ACBZ-500R7: Low Voltage Controller for Touch Screens
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 throughput rates of 105 kSPS. The devices include a shutdown mode that reduces current consumption to less than 6 μA.
To reduce the effects of noise from LCDs and other sources, the AD7879/AD7889 contain a preprocessing block. The prepro-cessing 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/AD7889 have a programmable pin that can operate as an auxiliary input to the ADC, as a battery monitor, or as a 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), as an interrupt to indicate when limits are exceeded (INT), or as a pen-down interrupt when the screen is touched (PENIRQ). The AD7879/AD7889 offer temp-erature measurement and touch-pressure measurement.
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 parts support an SPI interface (AD7879/AD7889) or an I²C® interface (AD7879-1/AD7889-1).
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sales terminals
- Medical devices
- Cell phones
AD7889-1ACBZ-500R7 特性
- 4-wire touch screen interface
- 1.6V to 3.6V operation
- Median and averaging filter to reduce noise
- Automatic conversion sequencer and timer
- WLCSP package with backside coating
- User-programmable conversion parameters
- Auxiliary analog input /Battery Monitor (0.5 V to 5 V)
- 1 Optional GPIO
- See data sheet for additional features.
AD7889-1ACBZ-500R7 功能框图
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| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7889-1ACBZ-500R7 | 量产 | 12 Ball WLCSP (1.61x2.01) | 12 | 工业 |
| AD7889-1ACBZ-RL | 量产 | 12 Ball WLCSP (1.61x2.01) | 12 | 工业 |
| AD7889ACBZ-500R7 | 量产 | 12 Ball WLCSP (1.61x2.01) | 12 | 工业 |
| AD7889ACBZ-RL | 量产 | 12 Ball WLCSP (1.61x2.01) | 12 | 工业 |
- 民用温度范围：0 ºC～＋70 ºC
- 军用温度范围：－55ºC ～＋125ºC
- 工业用温度范围：不同型号的产品的温度范围可能不同。
- 汽车工作温度范围：-40 ℃～ +125 ℃
AD7889-1ACBZ-500R7 应用技术支持与电子电路设计开发资源下载
- AD7889 数据手册DataSheet下载 . pdf
- Analog Devices, Inc.ADI 美国模拟器件公司产品订购手册 .pdf
- ADC模数转换器选型指南 . pdf
