AD7142: Programmable Controller for Capacitance Touch Sensors
The AD7142 and AD7142-1 are integrated capacitance-to-digital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7142-1 ...More
AD7142: Programmable Controller for Capacitance Touch Sensors
Product Description
The AD7142 and AD7142-1 are integrated capacitance-to-digital converters (CDCs) with on-chip environmental calibration for use in systems requiring a novel user input method. The AD7142 and AD7142-1 can interface to external capacitance sensors implementing functions such as capacitive buttons, scroll bars, or wheels.
The CDC has 14 inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (∑-Δ) capacitance-to-digital converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. The external sensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup. High resolution sensors require minor software to run on the host processor.
The AD7142 and AD7142-1 have on-chip calibration logic to account for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals, when the sensors are not touched. This ensures that there are no false or nonregistering touches on the external sensors due to a changing environment.
The AD7142 has an SPI-compatible serial interface, and the AD7142-1 has an I2C-compatible serial interface. Both parts have an interrupt output, as well as a general-purpose input/ output (GPIO).
The AD7142 and AD7142-1 are available in a 32-lead, 5 mm × 5 mm LFCSP_VQ and operate from a 2.6 V to 3.6 V supply. The operating current consumption is less than 1 mA, falling to 50 μA in low power mode (conversion interval of 400 ms).
Applications
- Personal music and multimedia players
- Cell phones
- Digital still cameras
- Smart hand-held devices
- Television, A/V, and remote controls
- Gaming consoles
Data Sheet, Rev. A, 1/07
Features
- Programmable capacitance-to-digital converter
36 ms update rate (@ maximum sequence length)
Better than 1 fF resolution
14 capacitance sensor input channels
No external RC tuning components required
Automatic conversion sequencer - On-chip automatic calibration logic
Automatic compensation for environmental changes
Automatic adaptive threshold and sensitivity levels - On-chip RAM to store calibration data
- SPI®-compatible serial interface (AD7142)
- I2C®-compatible serial interface (AD7142-1)
- Separate VDRIVE level for serial interface
- Interrupt output and GPIO
- 32-lead, 5 mm x 5 mm LFCSP_VQ
- 2.6 V to 3.6 V supply voltage
- Low operating current
Full power mode: less than 1 mA
Low power mode: 50 μA
Diagrams
- Enlarge
- Другие диаграммы
- Обозначения и трафареты для печатной платы
Functional Block Diagram for AD7142
Programmable Controller for Capacitance Touch Sensors
Другие диаграммы для AD7142
Programmable Controller for Capacitance Touch Sensors
AD7142 Pin Configuration
Functional Block Diagram for AD7142
Характеристики
| Resolution (Bits) | 16bit |
| T-Put Rate | 27.8SPS |
| # Chan | 14 |
| Supply V | Single(+2.6 to +3.6),Single(+2.7),Single(+3),Single(+3.3) |
| Pwr Diss (max) | 3.6mW |
| Sleep Pwr Diss | 65µW |
| Ain Range | ± 2 pF (Delta C) |
| Ref Int/Ext | Int/Ext |
| Product Description | CAPTouch (TM) Programmable Controller for 2-Electrode Capacitance Sensor with SPI or I2C Interface |
AD7152 - 12-битный преобразователь емкостного сигнала в цифровой код (2 входных емкостных канала)
AD7153 - 12-битный преобразователь емкостного сигнала в цифровой (1 входной емкостной канал)
| Part# | Resolution (Bits) | T-Put Rate | # Chan | Supply V | Pwr Diss (max) | Input Base C (pF Max) | Cin Range (pF) | Pkg Type | Price* (1000-4999) | Product Description | Interface |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AD7142 | 16 | 27.8SPS | 14 | Single(+2.6 to +3.6), Single(+2.7), Single(+3), Single(+3.3) | 3.6mW | 20 | ±2 | CSP | $1.37 | CAPTouch (TM) Programmable Controller for 2-Electrode Capacitance Sensor with SPI or I2C Interface | I²C/Ser 2-Wire, Ser, SPI |
| AD7143 | 16 | 43.5SPS | 8 | Single(+2.6 to +3.6) | 3.6mW | 20 | ±2 | CSP | $1.25 | CAPTouch (TM) Programmable Controller for 2-Electrode Capacitance Sensor with I2C Interface | I²C/Ser 2-Wire, Ser |
| AD7147 | 16 | 111SPS | 13 | Single(+3), Single(+3.3) | 3.6mW | 20 | ±8 | CSP | $1.30 | CAPTouch (TM) Programmable Controller w/ SPI or I2C Interface for Single-Electrode Cap Sensors | I²C/Ser 2-Wire, Ser, SPI |
| AD7150 | 12 | 100SPS | 2 | Single(+2.7 to +3.6) | 0.43mW | 10 | ±4 | SOP | $1.37 | Ultra-Lo Pwr, 2-Ch Capacitance Converter for Proximity Sensing Applications | I²C/Ser 2-Wire, Ser |
| AD7151 | 12 | 100SPS | 1 | Single(+2.7 to +3.6) | 0.3mW | 10 | ±4 | SOP | $1.37 | Ultra-Low Power, 1-Ch, Capacitance Converter for Proximity Sensing Applications | I²C/Ser 2-Wire, Ser |
| AD7745 | 24 | 90SPS | 1 | Single(+2.7 to +5.25) | 4.25mW | 17 | ±4 | SOP | $4.66 | 24-Bit, Cap-to-Dig Conv. w/ 1 SE/Diff Capacitive Input Ch for Interface to Dual Electrode Cap Sensor | I²C/Ser 2-Wire, Ser |
| AD7746 | 24 | 90SPS | 2 | Single(+2.7 to +5.25) | 4.25mW | 17 | ±4 | SOP | $5.01 | 24-bit, Cap-to-Dig Conv. w/ 2 SE/Diff Capacitive Input Ch for interface to Dual Electrode Cap Sensor | I²C/Ser 2-Wire |
| AD7747 | 24 | 45.5SPS | 1 | Single(+2.7 to +5.25) | 4.25mW | 17 | ±8 | SOP | $4.66 | 24-bit, Cap-to-Dig Conv w/1 SE/Diff Capacitive Input Ch for interface to Single Electrode Cap Sensor | I²C/Ser 2-Wire, Ser |
* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S.
Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.
AD7142 Model Options
| Модели | Статус | Корпуса | Pins | Температурный диапазон |
Цена* (1000 pcs.) |
Наличие | ROHS Compilant | Samples Cart | Purchase Cart |
|---|---|---|---|---|---|---|---|---|---|
| AD7142ACPZ-1500RL7 | Prodn | 32 ld LFCSP (5x5mm CP-32-2) | 32 | Ind | $ 1,37 | 08/22/2008 |
Y
Material Declaration |
Add To Cart | Add To Cart |
| AD7142ACPZ-1REEL | Prodn | 32 ld LFCSP (5x5mm CP-32-2) | 32 | Ind | $ 1,37 | 08/22/2008 |
Y
Material Declaration |
Обратная связь | Обратная связь |
| AD7142ACPZ-500RL7 | Prodn | 32 ld LFCSP (5x5mm CP-32-2) | 32 | Ind | $ 1,37 | 08/22/2008 |
Y
Material Declaration |
Add To Cart | Add To Cart |
| AD7142ACPZ-REEL | Prodn | 32 ld LFCSP (5x5mm CP-32-2) | 32 | Ind | $ 1,37 | 08/22/2008 |
Y
Material Declaration |
Обратная связь | Обратная связь |
Help
- "Pre-Release": модель микросхемы еще не запущена в серийное производство, однако можно получить образцы.
- Производство: модель производится, доступна для покупки и заказа образцов.
- Завершение продаж: запланировано снятие модели микросхемы с производства, но в течение некоторого ограниченного времени покупка еще возможна.
- Снято с производства: Микросхема снята с производства и не доступна для приобретения. Другие варианты, указанные в таблице, все еще производятся (если их статус любой, кроме "снято с производства")
Для более подробного описания корпуса и материалов - см. Package Site
- Коммерческое исполнение: 0…70°С
- Военное исполнение: от -55 до +125 градусов по Цельсию
- Индустриальное исполнение: диапазоны рабочих температур могут быть разные у разных моделей. См. техническое описание (datasheet)
- Automotive: -40 to +125 °С
Приведенные цены действительны в США и указаны только для примерного бюджетного рассчета. Цены указаны в долларах США (за штуку в указанном размере партии) и могут быть изменены. Цены в других регионах могут отличаться в зависимости от местных пошлин, налогов, сборов и курсов валют. Для уточнения стоимости обращайтесь в местные офисы продаж Analog Devices, или к официальным дистрибьюторам. Цены на оценочные платы и наборы указаны за штуку независимо от количества.



Close