A1391, A1392, A1393, and A1395: Micro Power 3 V Linear Hall Effect Sensor ICs with Tri-State Output and User-Selectable Sleep Mode

The A139x family of linear Hall effect sensor integrated circuits (ICs) provide a voltage output that is directly proportional to an applied magnetic field. Before amplification, the sensitivity of typical Hall effect ICs (measured in mV/G) is directly proportional to the current flowing through the Hall effect transducer element inside the ICs. In many applications, it is difficult to achieve sufficient sensitivity levels with a Hall effect sensor IC without consuming more than 3 mA of current. The A139x minimize current consumption to less than 25 µA through the addition of a user-selectable sleep mode. This makes these devices perfect for battery-operated applications such as: cellular phones, digital cameras, and portable tools. End users can control the current consumption of the A139x by applying a logic level signal to the SLEEP pin. The outputs of the devices are not valid (high-impedance mode) during sleep mode. The high-impedance output feature allows the connection of multiple A139x Hall effect devices to a single A-to-D converter input.

The quiescent output voltage of these devices is 50% nominal of the ratiometric supply reference voltage applied to the VREF pin of the device. The output voltage of the device is not ratiometric with respect to the SUPPLY pin.

Despite the low power consumption of the circuitry in the A139x, the features required to produce a highly-accurate linear Hall effect IC have not been compromised. Each BiCMOS monolithic circuit integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, and proprietary dynamic offset cancellation circuits. End of line, post-packaging, factory programming allows precise control of device sensitivity and offset.

DATASHEETS

A139x Family Datasheet

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High-impedance output during sleep mode
Compatible with 2.5 to 3.5 V power supplies
10 mW power consumption in the active mode
Miniature MLP package
Ratiometric output scales with the ratiometric supply reference voltage (VREF pin)
Temperature-stable quiescent output voltage and sensitivity
Wide ambient temperature range: –20°C to 85°C
ESD protection greater than 3 kV
Solid-state reliability
Preset sensitivity and offset at final test

These devices are available in a small 2.0 × 3.0 mm, 0.75 mm nominal height microleaded package (MLP/DFN), suffix EH. It is Pb (lead) free, with 100% matte tin leadframe plating.

EH-DFN

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Frequently-Asked Questions

Q1: What happens to the device if it is operated above max Vcc?

Q2: What happens to the device if it is operated below -20°C or above +85°C?

Q3: What happens if Vcc and Vref are tied together and toggled to conserve power?

Q4: What happens if Vref is higher than Vcc?

Q5: What happens if Vcc is higher than Vref?

Q6: What happens if Vcc is toggled and results in a potential that is lower than Vref for a short duration?

Q7: How long can Vcc be below Vref and at what voltage?

Q8: What does it mean that the sensitivity of the device is ratiometric with Vref?

Q9: What happens if Vref is connected to a source less than 2.5 V?

Q10: Can I multiplex several sensor ICs to a common input port (i.e. A/D) in the ECU?

Q11: How many A139x devices may be multiplexed in a parallel circuit?

Q1 - What happens to the device if it is operated above max Vcc?

The device will function properly but may also deviate from datasheet limits.

Q2 - What happens to the device if it is operated below -20°C or above +85°C?

Basic device functionality will be held in tact but datasheet specifications per the datasheet will may be compromised.

Q3 - What happens if Vcc and Vref are tied together and toggled to conserve power?

There will not be any issues and the device will function as it would if only the sleep pin was being toggled.

Q4 - What happens if Vref is higher than Vcc?

Sensitivity ratiometry only works up to Vref equal to Vcc, thus sensitivity would no longer be ratiometic to Vref.

Q5 - What happens if Vcc is higher than Vref?

There are no issues as long as Vcc is less than 3.5 V and Vref is greater than 2.5 V.

Q6 - What happens if Vcc is toggled and results in a potential that is lower than Vref for a short duration?

This should not cause any damage to the device.

Q7 - How long can Vcc be below Vref and at what voltage?

The device can handle 400 mV switching transients (digital noise), without a capacitor from Vcc to ground.

Q8 - What does it mean that the sensitivity of the device is ratiometric with Vref?

Sensitivity is directly proportional to Vref and is independent of Vcc variations.

Q9 - What happens if Vref is connected to a source less than 2.5 V?

The Hall plate bias goes into a non-linear state, which results in an invalid output.

Q10 - Can I multiplex several sensor ICs to a common input port (i.e. A/D) in the ECU?

Yes, please see the datasheet for maximum loading.

Q11 - How many A139x devices may be multiplexed in a parallel circuit?

The output capacitance of the A139x in sleep mode is nominally 60 pF. The total capacitance on the output of a 139x should not exceed 10 nF. Thus if the customer were to use an R-C filter or a sufficiently large capacitor on the output of each device, this could decrease the number of units. If the customer does use a capacitor on the output of each device in the circuit, the number of units that may be multiplexed is approximately 165 devices.

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Part Number Specifications and Availability
Part Number	Package Type	Temperature	RoHS Compliant	Part Composition / RoHS Data	Samples	Check Distributor Stock
A1391SEHLT-T	6-lead MLP	-20 ° C to 85 ° C	Yes	View Data	Contact your local sales rep	Check Distributor Stock
A1392SEHLT-T	6-lead MLP	-20 ° C to 85 ° C	Yes	View Data	Contact your local sales rep	Check Distributor Stock
A1393SEHLT-T	6-lead MLP	-20 ° C to 85 ° C	Yes	View Data	Contact your local sales rep	Check Distributor Stock
A1395SEHLT-T	6-lead MLP	-20 ° C to 85 ° C	Yes	View Data	Contact your local sales rep	Check Distributor Stock

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.

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A1391, A1392, A1393, and A1395: Micro Power 3 V Linear Hall Effect Sensor ICs with Tri-State Output and User-Selectable Sleep Mode

Design Support Tools

Frequently-Asked Questions

Part Number Specifications and Availability

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.