Overview
The AD7142ACPZ-1500RL7, produced by Analog Devices Inc., is an integrated capacitance-to-digital converter (CDC) designed for systems that require novel user input methods. This component is part of the AD7142 and AD7142-1 series, which are optimized for use in capacitive touch sensor applications. The AD7142-1 variant, specifically, features an I2C-compatible serial interface. These converters are ideal for implementing functions such as capacitive buttons, scroll bars, or wheels in various electronic devices.
Key Specifications
| Parameter | Value |
|---|---|
| Number of Capacitance Sensor Input Channels | 14 |
| Resolution | Better than 1 fF |
| Update Rate | 36 ms (at maximum sequence length) |
| Serial Interface | I2C-compatible (AD7142-1), SPI-compatible (AD7142) |
| Supply Voltage | 2.6 V to 3.6 V |
| Operating Current | Less than 1 mA (full power mode), 50 µA (low power mode) |
| Operating Temperature Range | −40°C to +85°C |
| Package Type | 32-lead, 5 mm x 5 mm LFCSP |
| Interrupt Output | General-Purpose Open-Drain Interrupt Output |
| GPIO | Programmable GPIO |
Key Features
- 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
- Interrupt output and GPIO
- Low operating current: less than 1 mA in full power mode and 50 µA in low power mode
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-1500RL7?
The primary function is to convert capacitance changes into digital signals, suitable for capacitive touch sensor applications. - What types of serial interfaces are available on 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 resolution of the AD7142?
The resolution is better than 1 fF. - What is the operating temperature range of the AD7142?
The operating temperature range is −40°C to +85°C. - What is the supply voltage range for the AD7142?
The supply voltage range is 2.6 V to 3.6 V. - Does the AD7142 require external RC tuning components?
No, the AD7142 does not require external RC tuning components. - What is the purpose of the on-chip automatic calibration logic?
The on-chip automatic calibration logic is used to compensate for environmental changes and ensure accurate sensing. - What are some common applications of the AD7142?
Common 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. - What is the package type of the AD7142?
The package type is a 32-lead, 5 mm x 5 mm LFCSP.
