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PDF HAL855 Data sheet ( Hoja de datos )
| Número de pieza | HAL855 | |
| Descripción | Programmable Linear Hall-Effect Sensor | |
| Fabricantes | Micronas | |
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Hardware
Documentation
Data Sheet
HAL® 855
Programmable Linear
Hall-Effect Sensor with
Arbitrary Output Characteristic
Edition Nov. 26, 2008
DSH000149_003EN
1 page  
DATA SHEET
HAL 855
Programmable Linear Hall-Effect Sensor with Arbi-
trary Output Characteristic
Release Note: Revision bars indicate significant
changes to the previous edition.
Micronas. The sensors are designed for automotive or
industrial applications. They operate with ambient tem-
peratures from −40 °C up to 150 °C. The HAL855 is
available in the very small leaded package TO92UT-1
and TO92UT-2.
1. Introduction
The HAL855 is a member of the Micronas family of
programmable linear Hall sensors. As an extension to
the HAL8x5 family, the HAL855 offers an arbitrary out-
put characteristic and individual programming of differ-
ent sensors which are in parallel to the same supply
voltage.
The HAL855 is an universal magnetic field sensor
based on the Hall effect. The IC is designed and pro-
duced in sub-micron CMOS technology and can be
used for angle or distance measurements if combined
with a rotating or moving magnet. The major charac-
teristics like magnetic field range, output characteristic,
output format, sensitivity, shift (offset), PWM period
and the temperature coefficients are programmable in
a non-volatile memory. The output characteristic can
be set with 32 setpoints.
The HAL855 features a temperature-compensated
Hall plate with choppered offset compensation, an
A/D-converter, digital signal processing, an EEPROM
memory with redundancy and lock function for the cali-
bration data, a serial interface for programming the
EEPROM, and protection devices at all pins. The inter-
nal digital signal processing is of great benefit because
analog offsets, temperature shifts, and mechanical
stress do not degrade the sensor accuracy.
The HAL855 is programmable by means of modulat-
ing the supply voltage. No additional programming pin
is needed. The easy programmability allows a 2-point
calibration by adjusting the output signal directly to the
input signal (like mechanical angle, distance, or cur-
rent). Individual adjustment of each sensor during the
customer’s manufacturing process is possible. With
this calibration procedure, the tolerances of the sensor,
the magnet, and the mechanical positioning can be
compensated in the final assembly. This offers a low-
cost alternative for all applications that presently need
mechanical adjustment or laser trimming for calibrating
the system.
In addition, the temperature compensation of the Hall
IC can be fitted to all common magnetic materials, by
programming first and second order temperature coef-
ficients of the Hall sensor sensitivity. This enables
operation over the full temperature range with high
accuracy.
The calculation of the individual sensor characteristics
and the programming of the EEPROM memory can
easily be done with a PC and the application kit from
1.1. Major Applications
Due to the sensor’s versatile programming character-
istics, the HAL855 is the optimal system solution for
applications such as:
– contactless potentiometers,
– rotary position measurement (e.g., pedal sensor),
– fluid level measurement,
– linear position detection, and
– magnetic field detection.
1.2. Features
– high-precision linear Hall effect sensors with differ-
ent output formats
– various programmable magnetic characteristics with
non-volatile memory
– programmable output characteristic
(32 setpoints with 9-bit resolution)
– programmable output formats
(PWM or serial Biphase-M)
– programmable PWM period
– open-drain output
– digital signal processing
– temperature characteristics programmable for
matching all common magnetic materials
– programming by modulation of the supply voltage
– lock function and built-in redundancy for EEPROM
memory
– operates from –40 °C up to 150 °C ambient temper-
ature
– operates from 4.5 V up to 18 V supply voltage
– operates with static magnetic fields and dynamic
magnetic fields up to 2 kHz
– choppered offset compensation
– overvoltage protection on all pins
– reverse-voltage protection on VDD pin
– magnetic characteristics extremely robust against
mechanical stress
– short-circuit-protected output
– EMC-optimized design
– programmable slew rate for optimized EMI behavior
Micronas
Nov. 26, 2008; DSH000149_003EN
5
5 Page 
DATA SHEET
HAL 855
Output Bittime
The OUTPUT BITTIME register defines the bit time of
the Biphase-M output signal. OUTPUT BITTIME is
“sub”-register of the SPECIAL CUSTOMER register.
Table 2–5: OUTPUT BITTIME register definition
Biphase-M Output Bit Time Bit Setting
40 μs
0
84 µs
1
168 µs
2
320 µs
3
700 µs
11
1.6 ms
4
3.2 ms
5
6.4 ms
7
Note: Setting the Biphase-M bit time to 40 μs simulta-
neously switches the programming telegram to
the same bit time. Hence after writing the
OUTPUT BITTIME register the timing of the pro-
gramming device has to be set accordingly.
TC and TCSQ
The temperature dependence of the magnetic sensitiv-
ity can be adapted to different magnetic materials in
order to compensate for the change of the magnetic
strength with temperature. The adaption is done by
programming the TC (Linear Temperature Coefficient)
and the TCSQ registers (Quadratic Temperature Coef-
ficient). Thereby, the slope and the curvature of the
temperature dependence of the magnetic sensitivity
can be matched to the magnet and the sensor assem-
bly. As a result, the output signal characteristic can be
fixed over the full temperature range. The sensor can
compensate for linear temperature coefficients ranging
from about −2100 ppm/K up to 600 ppm/K and qua-
dratic coefficients from about −5 ppm/K2 to 5 ppm/K2.
Please refer to Section 4.4. on page 28 for the recom-
mended settings for different linear temperature coeffi-
cients.
Slope
The SLOPE register contains the parameter for the
multiplier in the DSP. The Slope is programmable
between −4 and 4. The register can be changed in
steps of 0.00049. Slope = 1 corresponds to an
increase of the output signal by 100% if the digital
value at the A/D-converter output increases by 2048.
For all calculations, the digital value after the digital
signal processing is used. This digital information is
readable from the DIGITAL OUTPUT register.
Shift
The SHIFT register contains the parameter for the
adder in the DSP. Shift is the output signal without
external magnetic field (B = 0 mT) and programmable
from −100% up to 100%. For calibration in the system
environment, a 2-point adjustment procedure is rec-
ommended. The suitable Slope and Shift values for
each sensor can be calculated individually by this pro-
cedure.
Part Number
In case of Biphase-M output, a part number can be
defined. This part number will be sent during power-on
of the sensor if the PARTNUMBER ENABLE bit is set.
Afterwards, the sensor will send the digital value corre-
sponding to the applied magnetic field.
– The PARTNUMBER ENABLE bit is part of the
SPECIAL CUSTOMER register.
– The OUTPUT PERIOD register defines the time
interval for which the part number is sent.
Output Characteristic
The OUTPUT CHARACTERISTIC register defines the
shape of the sensor output signal. It consists of
32 setpoints. Each setpoint can be set to values
between 0 and 511 LSB. The output characteristic has
to be monotonic increasing (Setpoint0 ≤ Setpoint1
≤ SetpointN).
LOCKR
By setting this 1-bit register, all registers will be locked,
and the sensor will no longer respond to any supply
voltage modulation. This bit is active after the first
power-off and power-on sequence after setting the
LOCK bit.
Warning: This register cannot be reset!
Micronas
Nov. 26, 2008; DSH000149_003EN
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet HAL855.PDF ] | |
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