HAL 815
ADVANCE INFORMATION
2
Micronas
Contents
Page
Section
Title
3
1.
Introduction
3
1.1.
Major Applications
3
1.2.
Features
4
1.3.
Marking Code
4
1.4.
Operating Junction Temperature Range (T
J
)
4
1.5.
Hall Sensor Package Codes
4
1.6.
Solderability
4
1.7.
Pin Connections and Short Descriptions
5
2.
Functional Description
5
2.1.
General Function
7
2.2.
Digital Signal Processing and EEPROM
9
2.3.
Calibration Procedure
9
2.3.1.
General Procedure
10
2.3.2.
Calibration of the Angle Sensor
11
3.
Specifications
11
3.1.
Outline Dimensions
11
3.2.
Dimensions of Sensitive Area
11
3.3.
Position of Sensitive Area
12
3.4.
Absolute Maximum Ratings
12
3.5.
Recommended Operating Conditions
13
3.6.
Electrical Characteristics
14
3.7.
Magnetic Characteristics
14
3.8.
Open-Circuit Detection
14
3.9.
Overvoltage and Undervoltage Detection
15
3.10.
Typical Characteristics
17
4.
Application Notes
17
4.1.
Application Circuit
17
4.2.
Use of two HAL 815 in Parallel
17
4.3.
Temperature Compensation
18
4.4.
Undervoltage Behavior
18
4.5.
Ambient Temperature
18
4.6.
EMC and ESD
19
5.
Programming of the Sensor
19
5.1.
Definition of Programming Pulses
19
5.2.
Definition of the Telegram
21
5.3.
Telegram Codes
22
5.4.
Number Formats
23
5.5.
Register Information
23
5.6.
Programming Information
24
6.
Data Sheet History
Note: Some exclusivity restrictions may apply for the use of this sensor in automotive applications.
ADVANCE INFORMATION
HAL 815
Micronas
3
Programmable Linear Hall Effect Sensor
1. Introduction
The HAL 815 is a new member of the Micronas family
of programmable linear Hall sensors. As an extension
to the HAL 800, it offers open-circuit, as well as over-
voltage and undervoltage detection and individual pro-
gramming of different sensors which are in parallel to
the same supply voltage.
The HAL 815 is an universal magnetic field sensor with
a linear output based on the Hall effect. The IC is
designed and produced in sub-micron CMOS technol-
ogy and can be used for angle or distance measure-
ments if combined with a rotating or moving magnet.
The major characteristics like magnetic field range,
sensitivity, output quiescent voltage (output voltage at
B = 0 mT), and output voltage range are programma-
ble in a non-volatile memory. The sensor has a ratio-
metric output characteristic, which means that the out-
put voltage is proportional to the magnetic flux and the
supply voltage.
The HAL 815 features a temperature-compensated
Hall plate with choppered offset compensation, an A/D
converter, digital signal processing, a D/A converter
with output driver, an EEPROM memory with redun-
dancy and lock function for the calibration data, a
serial interface for programming the EEPROM, and
protection devices at all pins. The internal digital signal
processing is of great benefit because analog offsets,
temperature shifts, and mechanical stress do not
degrade the sensor accuracy.
The HAL 815 is programmable by modulating the sup-
ply voltage. No additional programming pin is needed.
The easy programmability allows a 2-point calibration
by adjusting the output voltage directly to the input sig-
nal (like mechanical angle, distance, or current). Indi-
vidual adjustment of each sensor during the cus-
tomer's manufacturing process is possible. With this
calibration procedure, the tolerances of the sensor, the
magnet, and the mechanical positioning can be com-
pensated 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 fit to all common magnetic materials by pro-
gramming first and second order temperature coeffi-
cients of the Hall sensor sensitivity. This enables oper-
ation 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
Micronas.
The sensor is designed for hostile industrial and auto-
motive applications and operates with typically 5 V
supply voltage in the ambient temperature range from
-
40 C up to 150 C. The HAL 815 is available in the
very small leaded package TO-92UT.
1.1. Major Applications
Due to the sensor's versatile programming character-
istics, the HAL 815 is the optimal system solution for
applications such as:
contactless potentiometers,
angle sensors,
distance measurements,
magnetic field and current measurement.
1.2. Features
high-precision linear Hall effect sensor with
ratiometric output and digital signal processing
multiple programmable magnetic characteristics in a
non-volatile memory (EEPROM) with redundancy
and lock function
open-circuit (ground and supply line break detec-
tion), overvoltage and undervoltage detection
for programming an individual sensor within several
sensors in parallel to the same supply voltage, a
selection can be done via the output pin
to enable programming of an individual sensor
amongst several sensors running parallel to the
same supply voltage, each sensor can be selected
via its output pin
temperature characteristics are programmable for
matching all common magnetic materials
programmable clamping function
programming through a modulation of the supply
voltage
operates from
-
40 C up to 150 C
ambient temperature
operates from 4.5 V up to 5.5 V supply voltage in
specification and functions up to 8.5 V
total error < 2.0% over operating voltage range and
temperature range
operates with static magnetic fields and dynamic
magnetic fields up to 2 kHz
overvoltage and reverse-voltage protection at all pins
magnetic characteristics extremely robust against
mechanical stress
short-circuit protected push-pull output
EMC and ESD optimized design
HAL 815
ADVANCE INFORMATION
4
Micronas
1.3. Marking Code
The HAL 815 has a marking on the package surface
(branded side). This marking includes the name of the
sensor and the temperature range.
1.4. Operating Junction Temperature Range (T
J
)
The Hall sensors from Micronas are specified to the
chip temperature (junction temperature T
J
).
A: TJ =
-
40 C to +170 C
K: TJ =
-
40 C to +140 C
E: TJ =
-
40 C to +100 C
The relationship between ambient temperature (T
A
)
and junction temperature is explained in Section 4.5.
on page 18.
1.5. Hall Sensor Package Codes
Example: HAL815UT-K
Type:
815
Package:
TO-92UT
Temperature Range:
T
J
=
-
40C to +140C
Hall sensors are available in a wide variety of packag-
ing versions and quantities. For more detailed informa-
tion, please refer to the brochure: "Ordering Codes for
Hall Sensors".
1.6. Solderability
Package TO-92UT: according to IEC68-2-58
During soldering reflow processing and manual
reworking, a component body temperature of 260 C
should not be exceeded.
Components stored in the original packaging should
provide a shelf life of at least 12 months, starting from
the date code printed on the package labels, even in
environments as extreme as 40 C and 90% relative
humidity.
1.7. Pin Connections and Short Descriptions
Fig. 11: Pin configuration
Type
Temperature Range
A
K
E
HAL 815
815A
815K
815E
HALXXXPA-T
Temperature Range: A, K, or E
Package: UT for TO-92UT
Type: 815
Pin
No.
Pin Name
Type
Short Description
1
V
DD
IN
Supply Voltage and
Programming Pin
2
GND
Ground
3
OUT
OUT
Push Pull Output
and Selection Pin
1
2
3
V
DD
OUT
GND
ADVANCE INFORMATION
HAL 815
Micronas
5
2. Functional Description
2.1. General Function
The HAL 815 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. 21). 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 V
DD
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.
Fig. 21: Programming with V
DD
modulation
Fig. 22: HAL 815 block diagram
V
OU
T
(V
)
5
6
7
8
V
DD
(V
)
HAL
815
V
DD
GND
OUT
analog
V
DD
digital
Internally
Temperature
Oscillator
Switched
100
Digital
D/A
Analog
OUT
V
DD
GND
Supply
EEPROM Memory
Lock Control
Digital
stabilized
Supply and
Protection
Devices
Dependent
Bias
Protection
Devices
Hall Plate
Signal
Processing
Converter
Output
Level
Detection
Output
A/D
Converter
10 k
Open-circuit,
Overvoltage,
Undervoltage
Detection
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