Si721x Field Output Hall Effect Magnetic
Position Sensors Data Sheet
The Si7211/2/3/4/5/6 family of Hall-effect sensors from Silicon Labs combines a chop-
per-stabilized Hall element with a low-noise analog amplifier, 13-bit analog to digital con-
verter. After A/D conversion the magnetic field data is available in analog. PWM or
SENT format (depending on the part number). Leveraging Silicon Labs' proven CMOS
design techniques, the Si721x family incorporates digital signal processing to provide
precise compensation for temperature and offset drift.
Compared with existing Hall-effect sensors, the Si721x family offers industry-leading
sensitivity and low noise, which enables use with larger air gaps and smaller magnets.
For automotive applications, the Si720x family is AEC-Q100 qualified.
In the simplest case, the Si721x devices are offered in a 3 pin package with power,
ground, and a single output pin that is signal corresponding to the magnetic field in ana-
log, PWM, or SENT format.
The Si721x devices are also offered in a 5 pin SOT23 and 8 pin DFN(coming soon)
packages where the additional pins can be used for sleep mode (DIS) or to activate an
on-chip coil for built in self-test (BISTb).
Applications
• Mechanical position sensing in consum- • Fluid level sensing
• Control knobs and selector switches
er, industrial and automotive applica-
tions
• Camera image stabilization, zoom, and
autofocus
FEATURES
• High-sensitivity Hall-Effect Sensor
• Low noise output corresponding to
magnetic field
• Integrated digital signal processing for
temperature and offset drift
compensation
• Low 50 nA Typical Sleep Current
Consumption
• Configurable Sensitivity, Output Polarity
and Sample Rate
• Sensitivity Drift < ±3% Over Temperature
• Wide power supply voltage
• 1.7 to 5.5 V
• 3.3 to 26.5 V
• AEC-Q100 Qualified for Automotive
Applications
• Configurable output options
• Analog (1.7 to 5.5V VDD)
• PWM
• SENT
• Industry-Standard Packaging
• Surface-mount SOT-23 (3 or 5 pin)
• TO92 package
• DFN package (coming soon)
Hall
Element
Si7211
ADC
Control Logic
Hall
Element
Si7212/13/14/15
ADC
Control Logic
DIS (Optional)
VOUT
ALERT/BIST
(OPTIONAL)
VDD
Reg
DIS (Optional)
PWM/SENT OUT
ALERT/BIST
(OPTIONAL)
VDD
Reg
Temp / Offset /
Mechanical Stress
Compensation
Temp / Offset /
Mechanical Stress
Compensation
GND
GND
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Table of Contents
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. PWM Output Description . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. SENT Output
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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.12
.13
.13
.13
.13
.13
5.1 tSENT Status Nibble .
5.2 SENT Data Nibbles .
5.3 CRC Calculation .
5.4 SENT Pause Pulse
5.5 SENT Frame Rate .
.
.
.
5.6 BIST Activation During SENT Operation .
6. Pin Description
7. Ordering Guide
8. Package Outline
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
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.18
.20
.22
8.1 SOT23 3-Pin Package .
8.2 SOT23-5 5-Pin Package .
8.3 TO92S 3-Pin Package .
9. Land Patterns
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.23
.24
9.1 SOT23 3-Pin PCB Land Pattern .
9.2 SOT23-5 5-Pin PCB Land Pattern
10. Top Marking
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
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.25
.26
.26
10.1 SOT23 3-Pin Top Marking
10.3 TO92 Top Marking .
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.
10.2 SOT23-5 5-Pin Top Marking .
11. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
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Si721x Field Output Hall Effect Magnetic Position Sensors 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
Power Supply
Power Supply
Power Supply
Temperature
Symbol
V
DD
V
DD
V
DD
V
DD
T
A
Test Condition
Si7211
Si7212/3
Si7214/5
Si7216
I grade
Min
2.25
1.71
3.3
4.0
-40
Typ
Max
5.5
5.5
26.5
26.5
+125
Unit
V
V
V
V
°C
Table 1.2. General Specification
1
Parameter
Input Voltage High
Input Voltage Low
Input Voltage Range
Input Leakage
Symbol
V
IH
V
IL
V
IN
I
IL
Test Condition
DIS or BIST pin
DIS or BIST pin
DIS or BIST pin
DIS or BIST pin
Min
0.7 x V
DD
-
0
< 0.1
Typ
-
-
Max
-
0.3 x V
DD
V
DD
1
Unit
V
V
V
µA
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Si721x Field Output Hall Effect Magnetic Position Sensors Data Sheet
Electrical Specifications
Parameter
Current Consumption
Average power depends on the
sample rate and percent of time
spent sampling versus sleep mode
or idle mode. See the selector
guide for average power calcula-
tions.
Symbol
I
DD
Test Condition
Sleep mode
V
DD
= 3.3 V, T = 25 °C
V
DD
= 3.3 V, T = 70 °C
V
DD
= 5.5 V, T = 125 °C
Conversion in progress
Si7211
• V
DD
= 3.3 V
• V
DD
= 5.0 V
Si7212/3
• V
DD
= 1.8 V
• V
DD
= 3.3 V
• V
DD
= 5.0 V
Si7214/5
Si7216
Idle mode
Si7212/3/7
Si7211
Si7214/5
Si7216
Conversion Time
T
CONV
First conversion when waking from
idle
Additional conversions in a burst
Idle Time
T
IDLE
Factory programmable from 0 to
200msec ±10%. See
Magnetic
Sensors Selector Guide
for more
details.
For Si721x analog, PWM and
SENT output parts, in sleep mode
(DIS high) the output is not active.
Wake Up Time
T
WAKE
Time from V
DD
> 1.7 V to first
measurement
1
msec
600
950
900
1400
11
8.8
-
1000
1150
1200
1700
µs
µs
5.5
7.3
6.5
8.5
mA
50
nA
1000
5000
nA
Min
Typ
Max
Unit
nA
3.5
5.0
6.8
6.5
7
4.5
6.0
8.0
8.5
9
mA
mA
mA
µA
Note:
1. BIST and DIS pin specifications apply when the pin is present.
2. For high voltage parts (V
DD
= 26.5 V maximum), the power on ramp should be faster than 10 V per second in the start-up region
from 2 to 3 V.
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Si721x Field Output Hall Effect Magnetic Position Sensors Data Sheet
Electrical Specifications
Table 1.3. Output Pin Specifications
Parameter
Si7211
Offset
1
B
OFF
V
DD
= 2.25 - 5.5 V
T = -40 to +125 °C
V
DD
= 2.25 - 3.6 V
T = 0 to +70 °C
Ratiometric Gain Error
Gain Accuracy
RGE
Change in gain as function of sup-
ply for V
DD
> 2.25.
-40 to +125 °C, V
DD
= 2.25- 5.5 V
0 - 70 °C, V
DD
= 2.25 - 3.6 V
Total Harmonic Distortion
Analog Noise at Output
2
Short Circuit Protection
Si7212/3
Output Voltage Low
Open Drain or Push Pull
V
OL
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
Si7214/5
Output Voltage Low
V
OL
I
OL
= 11.4 mA
V
DD
> 6 V
Safe Continuous Sink Current
Leakage
Output High
Output Pin Open Drain
I
OH
20
1
mA
µA
0.4
V
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
0.4
V
I
SS
Output shorted to ground of V
DD
THD
Vout inside 20-80% of V
DD
, V
DD
>
2.5 V
0.15
1
±15
±0.25
12
6
%
μV/rtHz
mA
%/V
%
±300
µT
±300
±500
µT
Symbol
Test Condition
Min
Typ
Max
Unit
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