A1340
High Precision Programmable Linear Hall Effect Sensor IC
with EEPROM, Analog Output, and Advanced Output Linearization
FEATURES AND BENEFITS
DESCRIPTION
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•
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Advanced 32-segment output linearization functionality
enables high output accuracy and linearity in the
presence of non-linear input magnetic fields
Customer adjustable sensitivity and offset, bandwidth,
output clamps, and 1st and 2nd order temperature
compensation
The A1340 device is a high precision, programmable Hall
effect linear sensor integrated circuit (IC) for both automotive
andnon-automotiveapplications.ThesignalpathoftheA1340
provides flexibility through external programming that allows
the generation of an accurate, and customized output voltage
from an input magnetic signal. The A1340 provides 12 bits of
output resolution,andsupportsamaximumbandwidthof3kHz.
Simultaneous programming of all parameters for accurate
and efficient system optimization
The BiCMOS, monolithic integrated circuit incorporates a
Hall sensor element, precision temperature-compensating
circuitrytoreducetheintrinsicsensitivityandoffsetdriftofthe
Hall element, a small-signal high-gain amplifier, proprietary
dynamic offset cancellation circuits, and advanced output
linearization circuitry.
• Factory trimmed magnetic input range (coarse sensitivity)
and signal offset
• Sensitivity temperature coefficient and magnetic offset drift
preset at Allegro, for maximum device accuracy without
requiring customer temperature testing
• Temperature-stable, mechanical stress immune, and
extremely low noise device output via proprietary
four-phase chopper stabilization and differential circuit
design techniques
• Diagnostics for open circuit and undervoltage
• Wide ambient temperature range: –40°C to 150°C
• Operates with 4.5 to 5.5 V supply voltage
With on-board EEPROM and advanced signal processing
functions, theA1340 provides an unmatched level of customer
reprogrammable options for characteristics such as gain and
offset, bandwidth, and output clamps. Multiple input magnetic
range and signal offset choices can be preset at the factory. In
addition, the device supports separate hot and cold, 1st and 2nd
order temperature compensation.
Package: 4-pin SIP (suffix KT)
A key feature of the A1340 is its ability to produce a highly
linear device output for nonlinear input magnetic fields.
To achieve this, the device divides the output into 32 equal
segments and applies a unique linearization coefficient factor
to each segment. Linearization coefficients are stored in a
look-up table in EEPROM.
1 mm case thickness
The A1340 sensor is available in a lead (Pb) free 4-pin single
in-line package (KT suffix), with 100% matte tin leadframe
plating.
Not to scale
Analog Subsystem
Digital Signal Processing
Output Stage
...00110011...
Magnetic
12-bit
Output
Voltage
12-bit
Signal
Factory Preset
Magnetic Range
and
Bandwidth
and
Temperature
Compensation
Sensitivity
and
Fine Offset
Adjustment
Hall
Element
A to D
Conversion
D to A
Conversion
Output
Driver
Clamps
Linearization
Signal Offset
Figure 1: A1340 Signal Processing Path.
Functions with programmable parameters indicated by double-headed arrows.
A1340-DS, Rev. 2
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