Overview
The AD7142ACPZ-500RL7, produced by Analog Devices Inc., is an integrated capacitance-to-digital converter (CDC) designed for systems that require novel user input methods such as capacitive buttons, scroll bars, or wheels. This device is part of the AD7142 series, which includes the AD7142 and AD7142-1, differing primarily in their serial interface options (SPI for AD7142 and I2C for AD7142-1). The AD7142ACPZ-500RL7 is packaged in a 32-lead, 5 mm x 5 mm LFCSP and operates from a 2.6 V to 3.6 V supply voltage.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution | 16 bits |
| Sampling Rate | 250 kHz |
| Number of Channels | 14 capacitance sensor input channels |
| Supply Voltage | 2.6 V to 3.6 V |
| Operating Current | Less than 1 mA (full power mode), 50 µA (low power mode) |
| Package Type | 32-lead LFCSP (5 mm x 5 mm) |
| Serial Interface | SPI-compatible (AD7142), I2C-compatible (AD7142-1) |
| Interrupt Output | Yes |
| GPIO | Yes |
| Update Rate | 36 ms (at maximum sequence length) |
| Resolution | Better than 1 fF |
Key Features
- On-chip automatic calibration logic to account for environmental changes.
- Automatic compensation for environmental changes.
- Automatic adaptive threshold and sensitivity levels.
- No external RC tuning components required.
- On-chip RAM to store calibration data.
- Interrupt output and GPIO.
- Low operating current: less than 1 mA in full power mode and 50 µA in low power mode.
- Support for capacitive buttons, scroll bars, or wheels.
Applications
- Personal music and multimedia players.
- Cell phones.
- Digital still cameras.
- Smart hand-held devices.
- Television, A/V, and remote controls.
- Gaming consoles.
Q & A
- What is the primary function of the AD7142ACPZ-500RL7? The AD7142ACPZ-500RL7 is an integrated capacitance-to-digital converter designed to convert capacitance changes into digital signals, typically used in capacitive touch sensors.
- What are the serial interface options for the AD7142 and AD7142-1? The AD7142 has an SPI-compatible serial interface, while the AD7142-1 has an I2C-compatible serial interface.
- How many capacitance sensor input channels does the AD7142 have? The AD7142 has 14 capacitance sensor input channels.
- What is the operating voltage range for the AD7142ACPZ-500RL7? The operating voltage range is from 2.6 V to 3.6 V.
- What is the resolution of the AD7142? The resolution is 16 bits.
- What is the sampling rate of the AD7142? The sampling rate is 250 kHz.
- Does the AD7142 require external RC tuning components? No, the AD7142 does not require external RC tuning components.
- What are some of the key applications of the AD7142? Key applications include personal music and multimedia players, cell phones, digital still cameras, smart hand-held devices, television and A/V remote controls, and gaming consoles.
- How does the AD7142 handle environmental changes? The AD7142 has on-chip automatic calibration logic to account for environmental changes, ensuring accurate readings regardless of ambient conditions.
- What is the power consumption of the AD7142 in full power and low power modes? In full power mode, the current consumption is less than 1 mA, and in low power mode, it is 50 µA.
