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A1342: Programmable Linear Hall IC with Advanced Diagnostics for Safety-Critical Applications

A1342 Datasheet

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Description

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The A1342 device is a high-precision, programmable Hall-effect linear sensor integrated circuit (IC) with an open-drain output, for both automotive and nonautomotive applications. The signal path of the A1342 provides flexibility through external programming that allows the generation of an accurate, and customized, output from an input magnetic signal.

The A1342 is an especially configurable and robust solution for the most demanding linear field sensor applications. The BiCMOS, monolithic IC incorporates a Hall sensing element, precision temperature-compensating circuitry to reduce the intrinsic sensitivity and offset drift of the Hall element, a small-signal high-gain amplifier, proprietary dynamic offset cancellation circuits, advanced output linearization circuitry, and advanced diagnostics. The A1342 provides an unmatched level of customer-programmable options.

A key feature of the A1342 is its ability to produce a highly linear device output for nonlinear input magnetic fields. To achieve this, the device features 16-segment customer-programmable linearization, where a unique linearization coefficient factor is applied to each segment. Linearization coefficients are stored in a look-up table in EEPROM.

The A1342 has two configurable output options: SENT or PWM. In addition to SAEJ2716, the A1342 includes two additional proprietary SENT options: SSENT and ASENT. Both protocols enable bus configurations with up to four devices on one SENT line to reduce system costs. SSENT provides sequential access to the sensors connected to the same line. SSENT provides a very low overhead method to maximize the sensor bandwidth on this single SENT line, minimizing impact on system performance. ASENT provides random access to all the sensors on the common SENT line. Both protocols allow individual sensors on the same line to enter diagnostic mode while the other sensors continue to respond to queries, allowing for the highest diagnostic coverage while maintaining 100% availability of the sensor solution.

The A1342 is available in a through-hole, lead (Pb) free 3-pin SIP package (UC suffix), with 100% matte-tin leadframe plating.

High-speed analog, A-to-D converter (ADC), and digital architectures, enabling user-selectable bandwidth for speed-sensitive applications
- 4-phase chopper stabilization, which minimizes offset drift across temperature range
- 16-bit, high update rate ADC
Automotive AEC-Q100 qualified
Exceptional stability throughout lifetime and across temperature changes
- Factory-configured using multisegment temperature compensation to give a flat baseline across operating temperature range
- Customer configurability for 1st and 2nd order sensitivity and 1st order offset compensation across temperature range
- Integrated feedback coil compensates for drift throughout product lifetime
Wide operating flexibility to meet any application:
- Input field range up to ±1500 G
- Rail to negative rail offset configurability
- High-precision, full output range high and low clamps
- Integrated linearization allows for flexible output waveform translation and compensation for nonlinear magnetic inputs
- Integrated capacitors offer extremely robust ESD performance and enhanced EMC performance
Advanced diagnostic-focused features enabling easier systemlevel ASIL compliance
- Full data path validation through active front-end stimulation with internal magnetic coil; this method validates all relevant transistors for device operation
- Logic Built-In Self Test (LBIST) on-demand to validate the digital subsystem
- Large suite of configurable fault monitors provide system level fault detection, including:
  - Overvoltage or undervoltage
  - Overtemperature
  - Magnetic Field Out of Range detection
  - Broken wire detection
Flexible output protocols with up to 12-bit resolution and configurable error notifications
- Digital open-drain output allows for flexible output voltage levels
- PWM (Pulse-Width-Modulated) output with diagnostic output mode to identify fault conditions
- SENT (Single Edge Nibble Transmission) compliant output with configurable reporting of error conditions and other diagnostic information
- Proprietary Fast SENT provides increased data rates to support high-bandwidth applications
- Device-shared SENT protocol as SSENT (Sequential SENT) and ASENT (Addressable SENT) allows user to connect up to four devices on the same output line for faster communication.
- Enhanced EMC tuning through programmable fall-time configurability
Integrated EEPROM enables a high level of configurability and product traceability
- Customer-reserved area allows on-board storage of unique lot and date code information
- Robust EEPROM with Single Error Correction and Double Error Detection (SECDED) capability
- Integrated charge pump allows in-application programming without any requirement for high voltages to be supplied to the device during programming
Allegro Sensor Bias LDO

Part Number Specifications and Availability

Part Number	Package Type	Temperature	RoHS Compliant	Part Composition / RoHS Data	Samples	Check Stock
A1342LUCLU-T	n/a	-20°C to 85°C	Yes	View Data	Contact your local sales rep	Check Distributor Stock
ASEK-1342-SUBKIT-T	DEMO BOARD	-40°C to 150°C	No	--	Contact your local sales rep	Check Distributor Stock
ASEK-1342-T-KIT	DEMO BOARD	-40°C to 150°C	No	--	Contact your local sales rep	Check Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

The A1342 is available in a through-hole, lead (Pb) free 3-pin SIP package (UC suffix), with 100% matte-tin leadframe plating.

UC Package Documentation

Design Support Tools

Application Notes

Calculating Temperature Compensation Using A1342 Linear Hall-Effect Sensor ICs (PDF)