NXP Semiconductors NMH1000

The NMH1000 is an ultra-low power monolithic Hall effect magnetic field sensor that provides a small footprint in a DFN 1.4 x 1.4 x 0.85 mm package in low-current and low-operating-voltage, I2C mode or standalone mode.

The sensor is most sensitive to a vertical field passing though the top-to-bottom surfaces, orthogonal to the plane of the application PCB. The input consists of a magnetic field ranging from earth-bound background to a maximum BGmax. Output is asserted when surrounding magnetic field is greater than the user-defined detection threshold. In the I2C mode, an indication of the magnetic field value can be reported out.

Key features

• Low power monolithic Hall effect magnetic field sensor
• Threshold selection 3-state hardware pin ( 70, 140 or 210 Gauss)
• Samples rate selection 3-state hardware pin ( 0.1 Hz, 1 Hz, 10 Hz)
• Mode selection hardware pin to select between standalone or I2C serial interface.

Additional features

System features

• Voltage supply range: 1.2 V to 3.6 V
• Current consumption: 75 nA @ 1 Hz
   

Stand alone mode

• Threshold selection 3-state hardware pin ( 70, 140 or 210 Gauss)
• Samples rate selection 3-state hardware pin ( 0.1 Hz, 1 Hz, 10 Hz)
   

I2C mode

• Threshold selection data bits
• Sample rate selection data bits (from 0.1 Hz to 100 Hz)

Applications

• Diabetes care
• Electronic device lid open/close detect
• Electronic system wake up, off the shelf wake up
• Industrial security
• Magnetic anti-tampering (gas or water meter)
• Reed switch replacement
• Smart inhaler
• Alarm systems (door or window open/close detect
• Home security and surveillance

Available tools

• FRDMSTBI-NMH1000 freedom shield evaluation board