Si720x Switch/Latch Hall Effect Magnetic
Position Sensor Data Sheet
The Si7201/2/3/4/5/6 family of Hall effect magnetic sensors
switches and latches from Silicon Labs combines a chopper-stabi-
lized Hall element with a low-noise analog amplifier, 13-bit analog-
to-digital converter, and a flexible comparator circuit. Leveraging
Silicon Labs' proven CMOS design techniques, the Si720x family
incorporates digital signal processing to provide precise compen-
sation for temperature and offset drift.
Compared with existing Hall effect sensors, the Si720x family offers industry-leading
sensitivity, which enables use with larger air gaps and smaller magnets. For battery-
powered applications, the Si720x family offers very low power consumption to improve
operating life.
The Si720x devices are offered in 3-pin SOT23, 5-pin SOT23, and TO-92 packages,
with power, ground, a single output pin that goes high or low as the magnetic field in-
creases, and with the 5-pin parts a disable(sleep) pin, and a tamper output pin. With the
three-pin package, tamper indication is by the pin going back to its zero field level at
high magnetic field.
Applications:
• Replacement of reed switches in con-
sumer, and security applications
• Position sensing of HVAC knob, door
locks, windows, and other mechanical
devices
• BLDC motor control
• Camera image stabilization, zoom,
and autofocus
• Fluid level sensing
• Control knobs and selector switches
• General-purpose mechanical position
sensing
FEATURES
• High-Sensitivity Hall Effect Sensor
• Maximum B
OP
operating point/minimum
field strength of <1.1 mT
• Omnipolar or unipolar operation
• Integrated digital signal processing for
temperature and offset drift
compensation
• Low 400 nA Typical Current Consumption
at 5 samples per second
• Selectable Sensitivity, Hysteresis, Output
Polarity and Sample Rate
• Sensitivity Drift < ±3% over Temperature
• Wide Power Supply Voltage
• 1.71 to 5.5 V
• 3.3 to 26.5 V
• Selectable Output Options
• Open-drain output
• Digital high/low output
• Industry-Standard Packaging
• Surface mount SOT-23 (3 or 5 pin)
• Through hole TO-92 (3-pin)
• 1.4 x 1.6 mm 8-pin DFN package
(coming soon)
Hall
Element
Si7201/2/3/4/5/6
ADC
Control Logic
DIS (Optional)
OUT1
OUT2 / TAMPERb
(Optional)
VDD
Reg
Temp / Offset /
Mechanical Stress
Compensation
GND
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Rev. 1.2
Table of Contents
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. DISABLE Pin Timing
4. Pin Description
5. Ordering Guide
6. Package Outline
. . . . . . . . . . . . . . . . . . . . . . . . . . .10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
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.21
.23
.25
6.1 SOT23 3-Pin Package .
6.2 SOT23-5 5-Pin Package .
6.3 TO92S 3-Pin Package .
7. Land Patterns
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.26
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7.1 SOT23 3-Pin PCB Land Pattern .
7.2 SOT23-5 5-Pin PCB Land Pattern
8. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1 SOT23 3-Pin Top Marking .
8.2 SOT23-5 5-Pin Top Marking
8.3 TO92 Top Marking.
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28
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9. Revision History
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Rev. 1.2 | 2
Si720x Switch/Latch Hall Effect Magnetic Position 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
Power Supply
Temperature
Symbol
V
DD
V
DD
T
A
Test Condition
Si7201/2/3/4
Si7205/6
I grade
Min
1.71
3.3
-40
Typ
Max
5.5
1
26.5
+125
2
Unit
V
V
°C
Note:
1. 3.6 V for most sensitive parts (see
5. Ordering Guide).
2. 0-70°C for most sensitive parts (F grade) (see
5. Ordering Guide).
Table 1.2. General Specifications
1
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
DIS pin
DIS pin
DIS pin
DIS pin
TAMPERb pin I
OL
= 3 mA
V
DD
> 2 V
TAMPERb pin I
OL
= 2 mA
V
DD
> 1.71 V
TAMPERb pin I
OL
= 6 mA
V
DD
> 2 V
Output Voltage High
V
OH
TAMPERb pin
I
OH
= 2 mA
V
DD
> 2.25 V
V
DD
– 0.4
V
0.6
V
0.2
V
Min
0.7 x V
DD
-
0
Typ
-
-
Max
-
0.3 x V
DD
V
DD
1
0.4
Unit
V
V
V
µA
V
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Si720x Switch/Latch Hall Effect Magnetic Position Sensor 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 ordering
guide for average power calcula-
tions for specific devices.
Symbol
I
DD
Test Condition
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
V
DD
= 3.3 V, T = 70 °C
V
DD
= 5.5 V, T = 125 °C
Conversion in progress
V
DD
= 1.8V
V
DD
= 3.3 V
V
DD
= 5.5 V
Conversion in progress high volt-
age parts
V
DD
= 3.3 to 26.5 V
Idle mode low voltage parts
V
DD
= 1.71 to 5.5 V
Idle mode high voltage parts
V
DD
= 3.3 to 26.5 V
Conversion Time
T
CONV
First conversion when waking from
sleep or idle
Additional conversions in a burst
Sample Rate
F
SAMPLE
Parts can be configured for sleep
or idle between samples. Sleep is
lower power, but the fastest sam-
pling rate is 8 kHz. Idle allows sam-
pling rate to be configured to be as
high as 113 kHz. See the ordering
guide for details.
Time from V
DD
> 1.71 V to first
measurement
11
8.8
-
µs
µs
0.9
1.2
mA
0.6
1
mA
3.5
5
6.8
6.5
5.5
6
8.0
8.5
mA
50
1000
5000
nA
nA
mA
nA
Min
Typ
0.4
Max
Unit
μA
Wake Up Time
T
WAKE
1
msec
Note:
1. TAMPERb and DIS pin specifications apply when the pin is present (Si7203/4).
2. Idle time can be factory programmed from 13.2 μsec to 206 msec ±10% or set to zero in which case conversions are done every
8.8 μsec. Normally idle time is only used at higher sample speeds.
3. 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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Si720x Switch/Latch Hall Effect Magnetic Position Sensor Data Sheet
Electrical Specifications
Table 1.3. Output Pin Specifications
Parameter
Si7201/2/3/4
Output Voltage Low
Open Drain or Push Pull
V
OL
I
OL
= 3 mA
V
DD
> 2 V
I
OL
= 2 mA
V
DD
> 1.71V
I
OL
= 6 mA
V
DD
> 2 V
Leakage
Output High
Output Pin Open Drain
Output Voltage High
Output Pin Push Pull
Slew Rate
Si7205/6
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
Slew Rate
Digital Output Mode
Output Pin Shorted to V
DD
I
SHORT
V
DD
= 12 V
Average current as pin cycles
4
mA
T
SLEW
5
%V
DD
/ns
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
Symbol
Test Condition
Min
Typ
Max
Unit
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