A3211 Sensor Magnetico Efecto Hall Digital Switch 5.5mt +-1mt Bipolar Sot 23 Itytarg

Función Interruptor omnipolar
Tecnología Efecto Hall
Polaridad Cualquiera
Rango de sensado Desconexión a ±5.5 mT, liberación a ±1 mT
Condiciones de prueba -40°C ~ 85°C
Voltaje de la fuente 2.5V ~ 3.5V
Corriente - Alimentación (máx.) 2mA
Corriente - Salida (máx.) 1mA
Tipo de salida Drenaje abierto
Características -
Temperatura de operación -40°C ~ 85°C (TA)

The A3211 and A3212 integrated circuits are ultrasensitive, pole
independent Hall-effect switches with latched digital output.
These devices are especially suited for operation in batteryoperated, hand-held equipment such as cellular and cordless
telephones, pagers, and palmtop computers. A 2.5 to 3.5 V
operation and a unique clocking scheme reduce the average
operating power requirements to less than 15 μW with a
2.75 V supply.
Unlike other Hall-effect switches, either a north or south pole
of sufficient strength will turn the output on in the A3212,
and in the absence of a magnetic field, the output is off. The
A3211 provides an inverted output. The polarity independence
and minimal power requirements allow these devices to easily
replace reed switches for superior reliability and ease of
manufacturing, while eliminating the requirement for signal
conditioning.
Improved stability is made possible through chopper
stabilization (dynamic offset cancellation), which reduces the
residual offset voltage normally caused by device overmolding,
temperature dependencies, and thermal stress.
This device includes on a single silicon chip a Hall-voltage
generator, small-signal amplifier, chopper stabilization, a
latch, and a MOSFET output. Advanced CMOS processing
is used to take advantage of low-voltage and low-power