ADS7142 Sensor Monitor

By Texas Instruments 356

ADS7142 Sensor Monitor

Texas Instruments' ADS7142 autonomously monitors signals while optimizing system power, reliability, and performance. It implements event-triggered interrupts per channel using a digital windowed comparator with programmable high and low thresholds, hysteresis, and event counter. This device includes a dual-channel analog multiplexer in front of a successive approximation register analog-to-digital converter (SAR ADC) followed by an internal data buffer for converting and capturing data from sensors.

The ADS7142 is available in a 10-pin QFN package and consumes only 900 nW of power. The small form-factor and low power consumption make this device suitable for space-constrained and battery-powered applications.

Features
  • Efficient host sleep and wake-up
    • Autonomous monitoring at 900 nW
    • Windowed comparator for event-triggered host wake-up
    • Data buffering during host sleep
  • Independent sensor configuration and calibration
    • Dual-channel, pseudo-differential, or ground-sense input configuration
    • Programmable thresholds for calibration
    • Internal calibration improves offset and drift
  • False trigger prevention
    • Programmable thresholds per channel
    • Programmable hysteresis for noise immunity
    • Event counter for transient rejection
  • Standalone, nanopower sensor monitor for cost-sensitive designs 
  • Small package size: 1.5 mm x 2 mm
  • Deep data analysis
    • Data buffer for false diagnostics
    • High-precision mode for 16-bit accuracy
    • One-shot mode for fast data capture
  • I2C interface
    • Compatible from 1.65 V to 3.6 V
    • Eight configurable addresses
    • Up to 3.4 MHz (high-speed)
  • Wide operating range
    • Analog supply: 1.65 V to 3.6 V
    • Temperature range: -40°C to +125°C
Applications
  • Sensor nodes for Internet of Things (IoT)
  • Gas, heat, PIR motion, and smoke detectors
  • Preventive maintenance for elevators, escalators, HVAC, industrial equipment, and so forth
  • Wearable electronics
  • Zero cross detection for fault indicators
  • Supervisory functions
  • Comparator with programmable reference
  • Sensors for deep learning artificial intelligence

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