INFINEON TLE4990

D a t a Sh e e t , V 2 . 4 , N o v e m b e r 2 0 0 5
TLE4990
TLE4990-E6782
Programmable Linear Output Hall Sensor
S e n s o rs
Edition 2005-11
Published by Infineon Technologies AG,
St.-Martin-Strasse 53,
81669 München, Germany
© Infineon Technologies AG 2005.
All Rights Reserved.
Attention please!
The information given in this document shall in no event be regarded as a guarantee of conditions or
characteristics (“Beschaffenheitsgarantie”). With respect to any examples or hints given herein, any typical values
stated herein and/or any information regarding the application of the device, Infineon Technologies hereby
disclaims any and all warranties and liabilities of any kind, including without limitation warranties of noninfringement of intellectual property rights of any third party.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest
Infineon Technologies Office (www.infineon.com).
Warnings
Due to technical requirements components may contain dangerous substances. For information on the types in
question please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support
devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain
and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may
be endangered.
TLE4990
Revision History:
2004-11
Previous Version:
V 2.0
V 2.2
2004-05
Page
Subjects (major changes since last revision)
6
Correction of typing error: Horizontal position of Hall cell (2.67mm)
21
Correction of typing errors: Width of package (5.34mm)
and width of tape (0.39mm)
Version 2.1: wrong tolerance of tape width
TLE4990
Revision History:
2005-01
Previous Version:
V 2.2
V 2.3
2004-11
Page
Subjects (major changes since last revision)
10
Table 2 Correction of typing error VOUTov min = -0.3V instead of 0.3V
TLE4990
Revision History:
2005-11
Previous Version:
2.3
Page
V 2.4
Subjects (major changes since last revision)
Removal of Version TLE4990-E6785
We Listen to Your Comments
Any information within this document that you feel is wrong, unclear or missing at all?
Your feedback will help us to continuously improve the quality of this document.
Please send your proposal (including a reference to this document) to:
[email protected]
TLE4990
Programmable Linear Hall Sensor
Table of Contents
Page
1
1.1
1.2
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Target Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Zero-field Output Voltage (Vzero) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Sensitivity (S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Gain Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clamping Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4
Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5
Electrical and Magnetic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Electrical Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Magnetic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6
6.1
6.4
Signal Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Magnetic Field Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Range register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gain Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gain Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clamping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Error Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8
Calibration and Fusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming of Sensors with Common Supply Lines . . . . . . . . . . .
Sensor Interface Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
10
Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2
6.3
Data Sheet
4
6
6
7
7
7
7
7
8
9
14
14
14
15
15
16
16
17
19
19
19
19
V 2.4, 2005-11
Programmable Linear Output Hall Sensor
1
Overview
1.1
Features
•
•
•
•
•
TLE4990
Single supply voltage 4.5 - 5.5 V
Temperature Range from -40 °C up to 150 °C
Very slim 4-pin package with only 1mm thickness
Temperature compensation
Programmable parameters stored in fuse memory:
– magnetic range and magnetic sensitivity (gain)
PG-SSO-4-1
– zero field voltage (offset)
– clamping option
– memory lock
– temperature coefficient (calibrated and fused during production)
Low drift of output signal over temperature and lifetime
Continuous measurement ranges between -200 mT and +200 mT or 0 and 400 mT
Output short circuit protection
Very linear and ratiometric rail-to-rail output signal with push-pull output
Reverse polarity and overvoltage protection for all pins
On-board diagnostics (wire breakage detection)
Individual programming and operation of multiple sensors with common power
supply
Completely calibrated and fused version -E6782
PG-SSO-4-1
•
•
•
•
•
•
•
•
1.2
•
•
•
Target Applications
Robust replacement of potentiometers
– No mechanical abrasion
– Resistant to humidity, temperature, pollution, and vibration
Linear and angular position sensing in automotive applications like pedal position,
suspension control, valve or throttle position, headlight levelling, and steering angle
High current sensing for battery management, motor control, and electronic fuse
Type
Package
TLE4990
PG-SSO-4-1
TLE4990-E6782
PG-SSO-4-1
Data Sheet
5
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Functional Description
2
Functional Description
Pin Configuration
Figure 1 shows the location of the hall element in the chip.
2.67 ± 0.1 mm
Center of
Hall Probe
0.3 ± 0.08 mm
1.85 ± 0.1 mm
Branded
Side
Hall
Probe
TST OUT GND VDD
Figure 1
Pin Configuration and Hall Cell Location
Table 1
Pin Definitions and Functions
Pin No.
Symbol
Function
1
TST
Test pin, must be grounded
2
OUT
Output voltage / programming interface
3
GND
Ground
4
VDD
Supply voltage / programming interface
Data Sheet
6
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Functional Description
General
The linear Hall IC TLE4990 has been designed specifically to meet the demands of
highly accurate rotation and position detection, as well as for current measurement
applications.
The sensor provides a ratiometric analog output voltage which is ideally suited for A/D
conversion with the supply voltage as a reference.
The IC is produced in BiCMOS technology with high voltage capability and also providing
reverse polarity protection.
Zero-field Output Voltage (Vzero)
The output voltage with no magnetic field present is called the zero field voltage Vzero.
It is programmable within the range of 3% to 19% of VDD (for Bipolar bit = 0) and 40% to
60% of VDD (for Bipolar bit = 1) by 10 ODAC bits with a resolution of 1.0 mV to 1.2 mV.
Magnetic Sensitivity (S)
The magnetic sensitivity is set in two steps: First the “coarse gain” is selected out of 8
values (3 PRE bits). Then the “fine gain” is adjusted by another 10 GDAC bits.
The resulting range of sensitivity extends from 15 mV/mT to 180 mV/mT at the nominal
supply voltage of 5 V. Note that as the sensitivity is ratiometric, it will also depend linearly
on the supply voltage.
The sensitivity of the -E6782 version is programmed during production.
It is calibrated to a value of 20 mV/mT at the nominal supply voltage of 5 V.
Temperature Gain Compensation
The temperature compensation of the sensitivity is programmed during production.
The value of +350 ppm/°C to provides an excellent accuracy for the use of a SmCo
permanent magnet. Stability is achieved by the dynamic offset cancellation technique to
eliminate any spurious mechanical or temperature effects.
Clamping Option
It is possible to reduce the output voltage swing from its original 3%... 97% VDD to a
limited swing of 10% ... 90% VDD by setting the clamping bit. This allows to detect a
broken wire. In this case the output voltage is tied to ≤ 6% or ≥ 94% of VDD.
Note: The -E6782 version has this feature disabled.
Data Sheet
7
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Functional Description
Block Diagram
Figure 2 shows a simplified block diagram.
OTPROM / RAM
Interface
Temperature
Linearization
Chopped
Hall
Probe
Zero magnetic
field voltage
Gain
Modulator
Demodulator
+
Sample &
Hold
Out
Clamping
Amplifier
Buffer
Clock
TLE4990_BLOCK_DIAGRAM
Figure 2
Block Diagram
Principle of Operation
•
•
•
•
•
•
•
•
A magnetic flux is measured by a Hall-Effect cell.
The Temperature compensation modulates the bias current of the hall cell.
The output signal from the Hall-Effect cell is amplified.
A zero field voltage is added.
The output voltage range can be clamped by limiters.
The final output value is amplified and buffered.
The output voltage is proportional to the supply voltage (ratiometric behavior).
An OBD (On Board Diagnostics) circuit connects the output to VDD or GND in case
of errors.
Data Sheet
8
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Functional Description
Transfer Functions
The examples in Figure 3 show how different magnetic field ranges can be mapped to
the output voltage.
•
Polarity mode:
– Unipolar: only magnetic fields in one direction are measured.
The zero field voltage is near to the GND level.
– Bipolar: Magnetic fields can be measured in both orientations.
The zero field voltage is about the half voltage.
B (mT)
B (mT)
VOUT (V)
5
125
VOUT (V)
50
5
0
0
VOUT
2.5
0
0
-125
-50
TLE4990_MAGNETIC_RANGE
Example 1: Bipolar,
setting used in -E6782 version
Figure 3
Example 2: Unipolar
Examples of Operation
B
TLE
4990
B
TLE
Increase of Magnetic Field
Increase of Output Voltage
Figure 4
Data Sheet
4990
Increase of Magnetic Field
Decrease of Output Voltage
Magnetic Field Direction Definition
9
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Absolute Maximum Ratings
3
Absolute Maximum Ratings
Table 2
Absolute Maximum Rating Parameters 1)
Parameter
Symbol
Limit Values
min.
Storage temperature
Junction temperature
Voltage on VDD pins with
respect to ground (VSS)
TST
TJ
VDD
Voltage on output pin with VOUTov
respect to ground (VSS)
Unit
max.
-40
150
°C
-40
160
°C
-18
24
V
-0.3
16
for TA ≤ 80 °C
max. 10 min.
for TA ≤ 80 °C
max. 5 min.
Magnetic field
BMAX
-
unlimited
T
ESD protection
VESD
-
2.0
kV
1)
Notes
according HBM
JESD22-A114-B
Only valid if the MEMlock bit is set and the TST pin is connected to GND.
Note: Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in
the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
During absolute maximum rating overload conditions (VIN>VDD or VIN<VSS) the
voltage on VDD pins with respect to ground (VSS) must not exceed the values
defined by the absolute maximum ratings.
Data Sheet
10
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Operating Range
4
Operating Range
The following operating conditions must not be exceeded in order to ensure
correct operation of the TLE4990. All parameters specified in the following
sections refer to these operating conditions, unless otherwise noticed.
Table 3
Operating Condition Parameters1)
Parameter
Supply voltage
Load resistance
Load capacitance
Ambient temperature 4)
Symbol Limit Values
Unit
min.
max.
VDD
RL
4.5
5.5
V
4.7
7
-
kΩ
CL
TA
0
50
nF
-40
150
°C
Notes
for OBD parameters 2)
3)
1)
Keeping signal levels within the limits specified in this table, ensures operation without overload conditions.
2)
OBD= On Board Diagnostics (see Table 12).
3)
A minimum capacitance of 1 nF is recommended in order to improve the EMC behavior.
4)
RTHja ≤ 150 K/W
Data Sheet
11
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Electrical and Magnetic Parameters
5
Electrical and Magnetic Parameters
Electrical Parameters
Table 4
Electrical characteristics
Parameter
Output voltage
range
Symbol Limit Values
VOUT
IDD
Output current
IOUT
Output Resistance ROUT
Zero field voltage
VZERO
Supply current
Notes
min.
typ.
max.
3
-
97
%
of VDD
RLOAD ≥ 4.7 kΩ
3.5
-
5.5
mA
IOUT = 0 mA 1)
-1.2
-
1.2
mA
-
3
11.2
Ω
1)
3
42
-
18
59
% VDD
Bipolar-Bit = 0 2) 3)
Bipolar-Bit = 1 2) 3)
49.95 50
Zero field voltage
drift
Unit
50.05
only version -E6782
3)
∆VZERO -10
-
10
-30
-
0
-40°C ≤ T < 25°C
-30
-
0
25°C ≤ T ≤ 150°C
-40
-
0
-40°C ≤ T ≤ 150°C 4)
mV
over lifetime
Ratiometry
Rat
99.8
100
100.2
%
5)
Power on time
tPon
0.3
0.6
0.75
ms
6)
Max. phase shift
error
φERR
2
4
8
degree
@ 100 Hz sine input
Output noise
Vnoise
fop
-
1.2
-
mVRMS
7)
1.1
1.6
2.3
kHz
-3 dB corner
frequency
Maximum
operating
frequency
1)
Valid for VOUT in the range from 10% to 90% VDD.
2)
Not for the -E6782 version.
3)
@ 25 °C
4)
For Sensitivity S < 80 mV/mT, for higher sensitivities the zero field drift is dominant (see Table 5).
5)
Definition: Rat = (VOUT(VDD) / VDD) / (VOUT (VDD = 5 V) / 5 V) x 100%
for Vout in the range from 10% VDD to 90% VDD.
6)
The output voltage has reached 99% of its final value within tPon after power on.
7)
No external filtering, with a sensitivity of 30 mV/mT (digital switching noise included) @ 25 °C.
Data Sheet
12
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Electrical and Magnetic Parameters
Magnetic Parameters
Table 5
Parameter
Sensitivity
Magnetic field
range
Magnetic Characteristics
Symbol Limit Values
S
MFR
Unit
Notes
min.
typ
max.
15
-
180
mV/mT programmable for
TLE4990 1) 2)
19.8
20
20.2
mV/mT TLE4990-E6782 1) 3)
± 13.05 -
± 204.5
mT
26.1
-
409
± 115.8
± 117.5 ± 118.2
Bipolar-Bit =1 4)
Bipolar-Bit =0 4)
TLE4990-E6782
Linearity
Lin
99.9
100
100.1
%
5)
Temperature
coefficient of
sensitivity
α
200
350
500
ppm/
°C
6)
Sensitivity drift ∆SL
over lifetime
-0.9
-
0.9
%
Ta = 25 °C
Zero field drift
over
temperature
∆B0
-500
-
150
µT
valid for
S > 80 mV/mT 7)
Resolution
Bn
20
-
60
µTRMS
8)
1)
@ VDD = 5 V
2)
In the lowest programmable sensitivity range a sensitivity less or equal to min(S) is guaranteed.
In the highest programmable sensitivity range a sensitivity of greater or equal to max(S) is guaranteed.
The ratio of max(S) / min(S) ≥ 15.
3)
@ 25 °C
4)
Not for the -E6782 version.
5)
B10% is the magnetic field, at which VOUT = 0.1 x VDD.
B90% is the magnetic field, at which VOUT = 0.9 x VDD.
VOUT,id = [0.1 + 0.8 x (B - B10%) / (B90% - B10%)] x VDD.
Lin = (VOUT / VOUT,id - 1) · 100% for all VOUT between 10% VDD and 90% VDD.
6)
The temperature coefficient of the magnetic sensitivity is the slope of a linear least-square fit through
the real curve.
7)
For lower sensitivities, the zero voltage drift is dominant (see Table 4).
8)
Equivalent to magnetic input noise at 25 °C. The equivalent magnetic input noise depends on the selected
sensitivity. At highest sensitivity it is typically 25 µTRMS, at lowest sensitivity it is typically 50 µTRMS at 25 °C.
Data Sheet
13
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Signal Processing
6
Signal Processing
6.1
Magnetic Field Ranges
Note: The Range setting is fixed in the -E6782 version.
The output signal of the Hall cell is amplified in the pre-amplifier.
Eight ranges can be selected by setting the PRE bits.
The output voltage range of 3 ... 97% of VDD leads to a swing of 4.7 V at VDD = 5 V.
Therefore the product of sensitivity and full scale range is always 4.7 V.
Note: Sensitivity x Full Scale range = 4.7 V
I
Table 6
Range Setting
Range
PRE bits
Sensitivity (mV/mT)
Typical Values
PRE2
PRE1
PRE0 min.
0
0
0
0
1
0
0
2
0
3
Magnetic Full Scale
Range (mT)
max.
min.
max.
11.49
16.49
285
409
1
16.17
23.20
203
291
1
0
22.75
32.65
144
207
0
1
1
32.00
45.96
102
147
4
1
0
0
45.04
64.63
72.7
104
5
1
0
1
63.38
90.92
51.7
74.2
6
1
1
0
89.16
127.9
36.8
52.7
7
1
1
1
125.5
180.0
26.1
37.5
In the bipolar mode, the full scale range is composed of a positive and a negative part
with the half value each. (e.g. ±142.4 mT ... ±204.4 mT in range 0).
Note: The range should be set before the calibration of the gain.
Range register
PRE (Preamplifier)
2
1
0
PRE2 ... PRE0
Data Sheet
14
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Signal Processing
6.2
Gain Setting
Note: The Gain setting is fixed in the -E6782 version.
The sensitivity is defined by the range (Preamp) and the gain setting. The output of the
preamplifier is multiplied with the gain value.
The sensitivity can be set in 1024 steps.
Table 7
Gain
Parameter
Symbol Limit Values
min.
Register size
-
Gain range
-
Notes
max.
10
1
Unit
bit
1.43
-
Gain Register
Gain
9
8
7
6
5
4
3
2
1
0
G9 ... G0
Table 8
Gain
Gain Register Setting
G
Remark
Dec.
Bin. (G9 ... G0)
1
0
0000000000
minimum gain
1.43
1023
1111111111
maximum gain
Data Sheet
15
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Signal Processing
6.3
Offset Setting
Note: The Offset value is fixed in the -E6782 version
The offset voltage corresponds to an output voltage with zero field at the sensor.
It can be set in 1024 steps in two different voltage ranges.
Table 9
Offset
Parameter
Symbol Limit Values
min.
Register size
-
Offset range
-
Notes
max.
10
3
40
bit
19
60
∆VOS
Offset quantization
steps
Unit
VDD
0.97
1.22
1)
The -E6782 version is programmed to 50% VDD.
2)
VDD = 5 V
Bipolar-Bit = 0 1) 2)
Bipolar-Bit = 1
% of
Bipolar-Bit = 0 2)
Bipolar-Bit = 1
mV
Offset Register
Offset
9
8
7
6
5
4
3
2
1
0
OS9 ... OS0
Table 10
Offset Register Setting
Offset
OS
BIP
Remark
Dec.
Bin. (OS9 ... OS0)
3% of VDD
0
0000000000
0
Unipolar
40% of VDD
0
0000000000
1
Bipolar
19% of VDD
1023
1111111111
0
Unipolar
60% of VDD
1023
1111111111
1
Bipolar
Data Sheet
16
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Signal Processing
6.4
Clamping
Note: The Clamping function is not enabled in the -E6782 version
The clamping function is useful to split the output voltage range into operating range and
error ranges.
If the magnetic field is outside the selected measurement range, the output voltage Vout
is limited to the clamping values.
Therefore an output voltage in the error range indicates a wire breakage (see Open
Circuit (OBD parameters), Table 12) or a short circuit.
The clamping function is enabled, when the clamp bit is set.
Table 11
Clamping Ranges
Parameter
Symbol Limit Values
min.
Clamping voltage low
Clamping voltage high
1)
VCL,low 8
VCL,high 88
Unit
Notes
12
%
of VDD 1)
92
%
of VDD 1)
max.
RLOAD ≥ 4.7 kΩ
The following figure shows how the magnetic field range between Bmin and Bmax is
mapped to voltages between 0.5 V and 4.5 V.
If it is not necessary to signal errors, the clamping should be disabled. In this case the
maximum output voltage range between 0.3 V and 4.7 V can be used.
Vout (V)
5
Error range
V CLH
4
3
Operating range
2
1
0
VCLL
Error range
Bmin
Bmax
B
Figure 5
Data Sheet
Clamping
17
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Error Detection
7
Error Detection
Broken supply lines can be detected by the OBD (On Board Diagnostics) and reported
to the µController.
Note: The OBD is only useful when the clamping function is enabled.
In the case of interrupted supply lines, the µController may warn the user.
If two sensors are placed in parallel, the output of the remaining working sensor may be
still used for an emergency operation.
Table 12
Open Circuit (OBD parameters)
Parameter
Symbol Limit Values
min.
max.
Unit
Notes
Output voltage
@ Open VDD line
VOUT
0
6
% VDD
1)
Output voltage
@ Open VSS line
1) With R ≥ 7 kΩ
L
VOUT
94
100
% VDD
1)
Data Sheet
18
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Calibration and Fusing
8
Calibration and Fusing
Usually the sensor is calibrated ’End Of Line’, when the complete magnetic system is
assembled. This compensates all magnetic and mechanical tolerances.
Note: The -E6782 version is already programmed completely. The contents of the
calibration OTP memory may not be changed furthermore.
During the calibration the internal settings are stored in a RAM. When the right values
are found, the information has to be stored in an one-time-programmable memory
(OTP).
This OTP memory consists of cavity fuses.
After fusing all bits, setting the MEMLOCK bit closes the memory. This prevents from
unwanted memory changes after the calibration
Data Transfer Protocol
A separate programming specification may be requested.
Programming of Sensors with Common Supply Lines
In many automotive applications two sensors are used to measure the same parameter.
This redundancy allows to continue the operation in an emergency mode. If both sensors
use the same power supply lines, they have to be programmed together.
Sensor Interface Tool
For the calibration of the sensor, a special hardware interface to a PC is required.
Data Sheet
19
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Application Circuit
9
Application Circuit
Figure 6 shows the connection of multiple sensors to a µ-Controller.
Ref
Voltage Tracke r
e.g.
TLE4250
ADCref
ADCin1
4.7nF
4.7nF
V DD
TLE
out
4990
GND
TST
µC
optional
V DD
TLE
out
4990
GND
4.7nF
ADCin2
10k
TST
10k
4.7nF
ADCGND
TLE4990_APPLICATION_CIRCUIT
Figure 6
Data Sheet
Application Circuit
20
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Package Outlines
10
Package Outlines
P-SSO-4-1
0.15 MAX.
5.16
5.34
0.39 ±0.1
Figure 7
Data Sheet
Package Outline
21
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Notes
Data Sheet
22
V 2.4, 2005-11
TLE4990
Programmable Linear Hall Sensor
Data Sheet
23
V 2.4, 2005-11
w w w . i n f i n e o n . c o m
Published by Infineon Technologies AG