Description
The TMR1222/TMR1228 series magnetic switches
integrated the tunneling magnetoresistance (TMR)
magnetic sensor and CMOS circuitry, which is able
to detect the change of magnetic field and output
high and low voltage signals for high accuracy position
detection.
Unlike Hall/AMR sensors, TMR sensors with extremely
high resistance values allows TMR1222/1228 to
achieve the supply current as low as 1.5 μA while
operating in the full-time power supply mode, and
maintaining the response frequency of the magnetic
signal is 1 kHz. Therefore, the TMR1222/TMR1228
can provide true continuous detection of magnetic
field signals, avoiding sampling errors from the
traditional time-sharing power supply mode.

Features and benefits
•• Tunneling magnetoresistance (TMR) technology
•• Low power consumption: supply current 1.5 μA
•• High frequency response: typ. 1 kHz
•• Bipolar latching operation
••Wide range supply voltages: 1.8 V to 5.5 V
•• CMOS push-pull output
•• High sensitivity
•• Excellent temperature stability
•• High tolerance to external magnetic field interference
•• RoHS & REACH compliant
Applications
•• Utility meters: water, gas, and heat meters
•• Proximity switches
•• Speed sensing
•• Linear and rotation position sensing
•• Linear and rotation direction sensing