Overview
The AD7814ARM from Analog Devices Inc. is a 10-bit digital temperature sensor designed to provide accurate and reliable temperature measurements. This device is packaged in an 8-lead MSOP or SOT-23 package, making it suitable for space-constrained applications. The AD7814 features a band gap temperature sensor and a 10-bit analog-to-digital converter (ADC), allowing it to monitor and digitize temperature readings with a resolution of 0.25°C. The sensor operates over a wide temperature range of -55°C to +125°C and has an accuracy of ±2°C. It also includes a flexible serial interface compatible with SPI, QSPI, and MICROWIRE protocols, making it easy to interface with most microcontrollers and DSPs.
Key Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 2.7 V to 5.5 V |
| Resolution | 10 bits |
| Accuracy | ±2°C (±3.5°C over full range) |
| Operating Temperature Range | -55°C to +125°C |
| Interface Type | SPI, QSPI, MICROWIRE |
| Package / Case | 8-MSOP, 8-TSSOP, SOT-23 |
| Mounting Type | Surface Mount |
| Supply Current | 400 µA |
| Shutdown Mode | Yes |
Key Features
- Wide supply voltage range: 2.7 V to 5.5 V
- Low supply current: 400 µA
- SPI-compatible serial interface
- Shutdown mode to reduce power consumption
- High accuracy: ±2°C over the operating temperature range
- Compact packaging: 8-MSOP, 8-TSSOP, and SOT-23 options
- Autoconversion every 350 µs with internal lockout signal to prevent spurious data
Applications
- Personal computers
- Office equipment
- Domestic appliances
- Hard disk drives
- Electronic test equipment
- Process control systems
Q & A
- What is the operating temperature range of the AD7814ARM?
The AD7814ARM operates over a temperature range of -55°C to +125°C.
- What is the resolution of the AD7814ARM temperature sensor?
The AD7814ARM has a resolution of 0.25°C with a 10-bit ADC.
- What types of interfaces does the AD7814ARM support?
The AD7814ARM supports SPI, QSPI, and MICROWIRE serial interfaces.
- Does the AD7814ARM have a shutdown mode?
Yes, the AD7814ARM can be placed in a shutdown mode via the control register to reduce power consumption.
- What is the supply voltage range for the AD7814ARM?
The supply voltage range for the AD7814ARM is 2.7 V to 5.5 V.
- How often does the AD7814ARM perform temperature conversions?
The AD7814ARM performs temperature conversions every 350 µs.
- What is the accuracy of the AD7814ARM temperature sensor?
The accuracy of the AD7814ARM is ±2°C over the operating temperature range.
- What are the packaging options for the AD7814ARM?
The AD7814ARM is available in 8-MSOP, 8-TSSOP, and SOT-23 packages.
- How does the AD7814ARM prevent spurious data during conversions?
The AD7814ARM has an internal lockout signal that prevents updates to the temperature value register during conversions.
- What is the typical supply current of the AD7814ARM?
The typical supply current of the AD7814ARM is 400 µA.
