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A1334LLETR-60-T Datasheet(PDF) 7 Page - Allegro MicroSystems

Part # A1334LLETR-60-T
Description  Precision Hall-Effect Angle Sensor IC
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1334LLETR-60-T Datasheet(HTML) 7 Page - Allegro MicroSystems

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Precision Hall-Effect Angle Sensor IC
A1334
6
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
FUNCTIONAL DESCRIPTION
Operational Modes
The A1334 angle sensor device is designed to support a wide
variety of automotive applications requiring measuring 0° to 360°
angle positions.
An option for two electrically-independent die in the same
package provides solid-state consistency and reliability. Each die
SPI port can be configured in a different RPM mode. The data
output selection is controlled by the address request in the SPI
Read command.
The A1334 has dual identical system-on-chip (SoC) architecture.
The output of each die is used by the host microcontroller to
provide a single channel of target data.
Angle Measurement
The A1334 can monitor the angular position of a rotating magnet
at speeds ranging from 0 to more than 7600 rpm. At lower
rotational speeds, the A1334 provides high-resolution angle mea-
surement accuracy. It can also support higher rates of rotational
speeds at reduced levels of angle measurement accuracy.
The A1334 can be configured to operate in two angular measure-
ment modes of operation: Low RPM mode, and High RPM
mode. For applications that have a speed range from 0 to 500 rpm
(can vary with AVG), the Low RPM mode provides increased
resolution. For applications above 500 rpm, configuring the
A1334 in High RPM mode provides angle measurements with
standard resolution. Above 7600 rpm, the A1334 continues to
provide angle data; however, the accuracy is proportionally
reduced.
The actual update rate of Low RPM mode can be changed by
setting the AVG bits in the EEPROM. (See the appendix Program-
ming Reference for details.) The selection of Low RPM mode or
High RPM mode can be programmed, via the Angle_Meas_Mode
bit, for the expected maximum rotational speed of the magnet
in operation to provide the highest corresponding level of angle
accuracy. However, the A1334 provides valid output data regard-
less of the selected mode and the application speed.
Although the range of the resolution of the measurement data
output, RESANGLE, is determined by the selection of either High
RPM or Low RPM mode, the measurement is also affected by
the intensity (B, in gauss) of the applied magnetic field from the
target. At lower intensities, a reduced signal-to-noise ratio will
cause one or two LSBs to change state randomly due to noise,
and the effective DAC resolution is reduced. These factors work
together, so when High RPM mode is selected, the effective
range of resolution is 8 to 10 bits (from lower to higher field
intensities), and in Low RPM mode, the effective range is 11 to
12 bits, depending on field strength and AVG selection.
Regardless of the field intensity and mode selection, the transmis-
sion protocol and number formatting remains the same. The MSB
is always transmitted first. The entire number should be read.
The Output Angle is always calculated at maximum resolution.
To be more explicit:
AngleOUT = 360 (°) × D[12:0] / (213)
(1)
This formula is always true, regardless of the applied field
intensity. What changes with the field and speed setting is how
uniform the LSBs of the measurement data (D 12:x) will be.
When using the dual die version of the A1334, it should be noted
that the secondary die (E2) is rotated 180° relative to the primary
die (E1). This results in a difference in measurement of approxi-
mately 180° between the two die, given perfect alignment of each
die to the target magnet.
This phenomenon can be counteracted by subtracting the offset
using a microprocessor. Alternatively, the difference between the
two die can be compensated for using the EEPROM for setting
the Reference Angle.
System-Level Timing
The A1334 outputs a new angle measurement every tANG µs. In
High RPM mode, the A1334 outputs a new angle measurement
every tANG µs, with an effective resolution of 10 bits. There
is, however, a latency of tLAT, from when the rotating magnet
is sampled by the CVH to when the sampled data has been
completely transmitted over the SPI interface. Because an SPI
interface Read command is not synchronous with the CVH tim-
ing, but instead is polled by the external host microcontroller, the
latency can vary. For single back-to-back SPI transactions (first
transaction is sending the Read register 0x0 command, second is
retrieving the angle data) the following scenarios are possible:
• Worst case: 2 CVH cycle + 2 SPI cycles
• Best case: 1.5 SPI cycles; 2 µs, assuming a 10 MHz SPI clock


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