CT81x
Digital Unipolar TMR Latch
for Consumer & Industrial
Applications
Product Description
The CT811 and CT812 are integrated unipolar magnetic latches that are de-
signed for consumer and industrial switching applications. It is based on Crocus
Technologys patented Magnetic Logic Unit (MLU) technology with integrated
CMOS process to provide a monolithic solution for superior sensing performance.
SOT-23 Package
This unipolar magnetic latch features an industry leading low power consumption
as low as 230 nA. It is capable of handling large air gap applications with low
magnetic fields down to 1.5 mT with best in class high frequency performance.
For design flexibility, the CT811 and CT812 are offered in active-low open drain
and push-pull configurations respectively. These latches are available in a 3-lead
TO-92S package and a low profile yet small form factor 3-lead SOT-23 package,
providing cost effective and space-saving solutions for high volume manufactur-
ing.
TO-92S Package
Application Examples
Features and Benefits
IoT devices
High sensitivity, B as low as 1.5 mT
OP
Smartphones, tablets, and laptops
Resistant to mechanical stress
Door or lid closure detection
Ultra-low power consumption as low as 230 nA
Digital CMOS push-pull and open drain options Reed switch replacement
Motor controllers
Low profile and small form factor packaging
Proximity detection
RoHS Compliant
Power switch or open-close detection
Tamper-proofing for utility meters
Fluid level detection
2018 Crocus Technology Page 1
Document Number CT81x Series Datasheet Rev 0.5
CT81x
Digital Unipolar TMR Latch
for Consumer & Industrial
Applications
Figure 1: CT81x Block Diagram
CT81x (SOT23 Package) Block Diagram
VDD
1
Open
Analog State Drain/
2
OUT
MLU
Front-End Machine Push-pull
Output
UVLO Biases Oscillator
3
GND
2018 Crocus Technology Page 2
Document Number CT81x Series Datasheet Rev 0.5