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PDF HAL805 Data sheet ( Hoja de datos )
| Número de pieza | HAL805 | |
| Descripción | Programmable Linear Hall Effect Sensor | |
| Fabricantes | Micronas | |
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MICRONAS
PRELIMINARY DATA SHEET
HAL805
Programmable Linear
Hall Effect Sensor
Edition Feb. 2, 2000
6251-513-1PD
MICRONAS
1 page  
PRELIMINARY DATA SHEET
HAL 805
2. Functional Description
2.1. General Function
The HAL 805 is a monolithic integrated circuit which
provides an output voltage proportional to the mag-
netic flux through the Hall plate and proportional to the
supply voltage (ratiometric behavior).
The external magnetic field component perpendicular
to the branded side of the package generates a Hall
voltage. The Hall IC is sensitive to magnetic north and
south polarity. This voltage is converted to a digital
value, processed in the Digital Signal Processing Unit
(DSP) according to the settings of the EEPROM regis-
ters, converted to an analog voltage with ratiometric
behavior, and stabilized by a push-pull output transis-
tor stage. The function and the parameters for the DSP
are explained in Section 2.2. on page 7.
The setting of the LOCK register disables the program-
ming of the EEPROM memory for all time. This regis-
ter cannot be reset.
As long as the LOCK register is not set, the output
characteristic can be adjusted by programming the
EEPROM registers. The IC is addressed by modulat-
ing the supply voltage (see Fig. 2–1). In the supply
voltage range from 4.5 V up to 5.5 V, the sensor gener-
ates an analog output voltage. After detecting a com-
mand, the sensor reads or writes the memory and
answers with a digital signal on the output pin. The
analog output is switched off during the communica-
tion.
Several sensors in parallel to the same supply and
ground line can be programmed individually. The
selection of each sensor is done via its output pin.
The open-circuit detection provides a defined output
voltage if the VDD or GND line is broken. Internal tem-
perature compensation circuitry and the choppered off-
set compensation enables operation over the full tem-
perature range with minimal changes in accuracy and
high offset stability. The circuitry also rejects offset
shifts due to mechanical stress from the package. The
non-volatile memory consists of redundant EEPROM
cells. In addition, the sensor IC is equipped with
devices for overvoltage and reverse-voltage protection
at all pins.
HAL
805
8 VDD
7
6
5
VDD
OUT
GND
digital
Fig. 2–1: Programming with VDD modulation
analog
VDD
Internally
stabilized
Supply and
Protection
Devices
Temperature
Dependent
Bias
Oscillator
Open
Circuit
Detection
Protection
Devices
Switched
Hall Plate
A/D
Converter
Digital
Signal
Processing
D/A
Converter
Analog
Output
100 Ω
GND
Supply
Level
Detection
EEPROM Memory
Lock Control
Fig. 2–2: HAL 805 block diagram
Micronas
Digital
Output
10 kΩ
OUT
5
5 Page 
PRELIMINARY DATA SHEET
HAL 805
Step 2: Calculation of VOQ and Sensitivity
There are two ways to calculate the values for VOQ
and Sensitivity.
Manual Calculation:
Set the system to calibration point 1 (angle 1 = −25°)
and read the register ADC-READOUT. For our exam-
ple, the result is ADC-READOUT1 = −2500.
Next, set the system to calibration point 2 (angle 2 =
25°), and read the register ADC-READOUT again. For
our example, the result is ADC-READOUT2 = +2350.
With these measurements and the targets VOUT1 =
4.5 V and VOUT2 = 0.5 V, the values for Sensitivity and
VOQ are calculated as
4.5 V − 0.5 V 2048
Sensitivity = −2500 − 2350 * 5 V = −0.3378
VOQ = 4.5 V −
−2500 * (−0.3378) * 5 V = 2.438 V
2048
Software Calibration:
Use the menu CALIBRATE from the PC software and
enter the values 4.5 V for VOUT1 and 0.5 V for VOUT2.
Set the system to calibration point 1 (angle 1 = −25°),
hit the button “Read ADC-Readout1”, set the system to
calibration point 2 (angle 2 = 25°), hit the button “Read
ADC-Readout2”, and hit the button “Calculate”. The
software will then calculate the appropriate VOQ and
Sensitivity.
This calculation has to be done individually for each
sensor. Now, write the calculated values with the “write
and store” command into the HAL 805 for program-
ming the sensor.
Step 3: Locking the Sensor
The last step is activating the LOCK function with the
“LOCK” command. The sensor is now locked and does
not respond to any programming or reading com-
mands.
Warning: This register cannot be reset!
3. Specifications
3.1. Outline Dimensions
1.5
0.3
4.06 ±0.1
x1 x2
sensitive area
y
4.05 ±0.1
0.48
0.55 1 2 3
0.36
0.42
13.0
min.
1.27 1.27
(2.54)
branded side
45°
SPGS0014-3-A/1E
0.8
Fig. 3–1:
Plastic Transistor Single Outline Package
(TO-92UT)
Weight approximately 0.14 g
Dimensions in mm
Note: A mechanical tolerance of ±50 µm applies to all
dimensions where no tolerance is explicitly given.
3.2. Dimensions of Sensitive Area
0.25 mm x 0.25 mm
3.3. Position of Sensitive Area
TO-92UT
x1 − x2/ 2 ≤ 0.2 mm
y = 1.5 mm ± 0.2 mm
Micronas
11
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| PDF Descargar | [ Datasheet HAL805.PDF ] | |
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