Si7210 I
2
C Hall Effect Magnetic Position
and Temperature Sensor Data Sheet
The Si7210 family of Hall effect magnetic sensors from Silicon Labs combines a chop-
per-stabilized Hall element with a low-noise analog amplifier, 13-bit analog-to-digital
converter, and an I
2
C interface. Leveraging Silicon Labs' proven CMOS design techni-
ques, the Si7210 family incorporates digital signal processing to provide precise com-
pensation for temperature and offset drift.
Compared with existing Hall effect sensors, the Si7210 family offers industry-leading
sensitivity, which enables use with larger air gaps and smaller magnets. The integrated
13-bit high-precision ADC delivers high output linearity with very low noise for the high-
est measurement accuracy. For battery-powered applications, the Si7210 family offers
very low power consumption to improve operating life.
The Si7210 family supports a bidirectional I
2
C interface which provides full configurabili-
ty of the Hall effect sensor operate and release points. At any time, the 13-bit magnetic
field strength can be read through the I
2
C interface.
Applications
• Mechanical position sensing in consum- • Speed sensing
• Utility meters
er, industrial applications
• Control knobs and selector switches
• Replacement of reed switches
• Fluid level measurement
FEATURES
• High-Sensitivity Hall Effect Sensor
• Adjustable Full Scale (Standard
Offerings are ±20mT and ±200 mT Full
Scale)
• Integrated Digital Signal Processing for
Temperature and Offset Drift
Compensation
• High-Precision 13-bit Signal Path
• Output Bandwidth up to 20 kHz
• Sensitivity Drift < ±5% over 0-70 °C
• Digital I
2
C Interface
• Four Selectable I
2
C Addresses
• Optional Digital Alert Output
• Wide 1.7 to 5.5 V Power Supply Voltage
• Temperature Sensor Data also available
by I
2
C (accuracy ±1°C)
• Low 50 nA Sleep Mode Current
Consumption
• Industry-Standard Packaging
• Surface-Mount SOT23-5
• 1.4 x 1.6 mm 8-pin DFN package
Hall Element
Si7210
ADC
DSP & Control
Logic
SCL
SDA
VDD
Reg
Temp / Offset /
Mechanical Stress
Compensation
ALERT
GND
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Rev. 1.2
Table of Contents
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. I
2
C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Register Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Field Descriptions . . . . . . . . . . . . .
4.1.1 Chip ID . . . . . . . . . . . . . . .
4.1.2 Fields Associated with Reading DATA . . . .
4.1.3 Fields Associated with Configuring the Output Pin.
4.1.4 Registers Associated with Control of Idle Time . .
4.1.5 Registers Associated with Setting the Output Scale
4.1.6 Registers Associated with Adding Digital Filtering .
4.1.7 Registers to Read OTP Data . . . . . . . .
4.1.8 Control of On-Chip Test Coil . . . . . . . .
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.11
.11
.12
.13
.14
.15
.15
.16
.17
5. Making Temperature Measurements. . . . . . . . . . . . . . . . . . . . . .
6. Pin Descriptions
6.1 SOT-23 Pin Description .
6.2 DFN Pin Description .
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18
.19
.20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7. Ordering Information
8. Package Outline
. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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.24
.26
.28
.29
.30
.31
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
.
8.1 SOT23-5 5-Pin Package .
8.2 TDFN 8-Pin Package .
9. Land Patterns
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
.
.
.
9.1 SOT23-5 5-Pin PCB Land Pattern
9.2 TDFN 8-Pin PCB Land Pattern
10. Top Marking
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
.
.
10.1 SOT23-5 5-Pin Top Marking .
10.2 TDFN 8-Pin Top Mark .
11. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
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Rev. 1.2 | 2
Si7210 I
2
C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
1. Electrical Specifications
Unless otherwise specified, all min/max specifications apply over the recommended operating conditions.
Table 1.1. Recommended Operating Conditions
Parameter
Power Supply
Temperature
I
Temp
Grade
Symbol
V
DD
T
A
Test Condition
Min
1.71
-40
Typ
Max
5.5
+125
Unit
V
°C
Table 1.2. General Specifications
Parameter
Input Voltage High
Input Voltage Low
Input Voltage Range
Input Leakage
Output Voltage Low
Symbol
V
IH
V
IL
V
IN
I
IL
V
OL
Test Condition
SCL, SDA pins
SCL, SDA pins
SCL, SDA with respect to ground
SDA, SCL
SCL, SDA I
OL
= 3 mA
V
DD
> 2 V
SCL, SDA I
OL
= 2 mA
V
DD
> 1.71 V
SCL, SDA I
OL
= 6 mA
V
DD
> 2 V
Current Consumption
I
DD
Sleep timer enabled average at
V
DD
= 3.3 V and 200 msec sleep
time
Sleep mode
V
DD
= 3.3 V, T = 25 °C
Sleep mode
V
DD
= 3.3 V, T = 70 °C
Sleep mode
V
DD
= 5.5 V, T = 125 °C
Conversion in progress:
1.8 V
3.3 V
5.0 V
Idle mode
Conversion Time
T
CONV
Conversion time for first measure-
ment in a burst
Additional conversions in a burst
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Min
0.7 x V
DD
-
0
Typ
-
-
Max
-
0.3 x V
DD
V
DD
Unit
V
V
V
µA
V
< 0.1
1
0.4
0.2
V
0.6
V
0.4
μA
50
1000
nA
5000
mA
3.5
5.0
6.8
360
11
8.8
4.5
6
8.5
1000
μA
µs
µs
Rev. 1.2 | 3
Si7210 I
2
C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
Max
Unit
Parameter
Sleep Time
Idle Time
1
Symbol
T
SLEEP
T
IDLE
Test Condition
Factory configurable from 1 to 200
msec ±20%
slTime = 0x01
slFast = 1
slTime = 0xFF
slFast = 0
Min
Typ
-
11.9
13.2
14.5
µs
185
206
227
msec
Wake Up Time
T
WAKE
Time from V
DD
> 1.7 V to first
measurement
1
msec
Note:
1. Part can go to either idle more or sleep mode between conversions. If part is in idle mode with slTime = 0x00 and slFast = 1
conversion are continuous at 8.8 μsec interval.
Table 1.3. Output Pin Specifications
Parameter
Output Voltage Low
Output Pin Open Drain or Push
Pull
Symbol
V
OL
Test Condition
I
OL
= 3 mA
V
DD
> 2 V
I
OL
= 2 mA
V
DD
> 1.7 V
I
OL
= 6 mA
V
DD
> 2 V
Leakage
Output high
Output Pin Open Drain
Output Voltage High
Output Pin Push Pull
Slew Rate
Digital Output Mode
T
SLEW
V
OH
I
OH
= 2 mA
V
DD
>2.25 V
5
%V
DD
/ns
V
DD
– 0.4
V
I
OH
1
µA
0.6
V
0.2
V
Min
Typ
Max
0.4
Unit
V
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Si7210 I
2
C Hall Effect Magnetic Position and Temperature Sensor Data Sheet
Electrical Specifications
Table 1.4. I
2
C Interface Specification
Parameter
SCL Clock Frequency
Start Condition Hold Time
LOW Period of SCL
HIGH Period of Clock
Set Up Time for a Repeated Start
Data Hold Time
Data Set Up Time
Set Up Time for a STOP Condition
Bus Free Time between STOP and
START
Data Valid Time (SCL Low to Data
Valid)
Data Valid Acknowledge Time
(time from SCL Low to SDA Low)
Hysteresis
Suppressed Pulse Width
1
t
SP
Symbol
f
SCL
t
SDH
t
SKL
t
SKH
t
SU
;
STA
t
DH
t
DS
t
SPS
t
BUF
t
VD;DAT
t
VD;ACK
Digital input hysteresis SDA and
SCL
7
50
Test Condition
Min
0
0.6
1.3
0.6
0.6
0
100
0.6
1.3
0.9
0.9
17
ns
µs
µs
µs
µs
%V
DD
ns
Typ
Max
400
Unit
kHz
µs
µs
µs
µs
Note:
1. Pulses up to and including 50 nsec will be suppressed.
1/f
SCL
SCL
t
SKH
t
SP
t
SKL
t
BUF
t
STH
t
DS
t
DH
t
SPS
SDA
D6
D5
D4
D0
R/W
ACK
Start Bit
Stop Bit
t
STS
Figure 1.1. I
2
C Interface Timing
t
VD
:
ACK
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