Si721x Field Output Hall Effect Magnetic
Position Sensors Data Sheet
The Si7211/2/3/4/5/6/7 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- FEATURES
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
High-sensitivity Hall-Effect Sensor
design techniques, the Si721x family incorporates digital signal processing to provide
Low noise output corresponding to
magnetic field
precise compensation for temperature and offset drift.
Integrated digital signal processing for
Compared with existing Hall-effect sensors, the Si721x family offers industry-leading
temperature and offset drift
sensitivity and low noise, which enables use with larger air gaps and smaller magnets.
compensation
Low 50 nA Typical Sleep Current
In the simplest case, the Si721x devices are offered in a 3 pin SOT23 or TO92 pack-
Consumption
ages with power, ground, and a single output pin that is signal corresponding to the
Configurable Sensitivity, Output Polarity
magnetic field in analog, PWM, or SENT format.
and Sample Rate
Sensitivity Drift < 3% Over Temperature
The Si721x devices are also offered in a 5 pin SOT23 and an 8 pin DFN(coming soon)
packages where the additional pins can be used for sleep mode (DIS) or to activate an
Wide power supply voltage
on-chip coil for built in self-test (BISTb).
1.7 to 5.5 V
3.3 to 26.5 V
Applications
Configurable output options
Fluid level sensing
Mechanical position sensing in consum- Analog
er, industrial applications Control knobs and selector switches
PWM
Camera image stabilization, zoom, and
SENT
autofocus
Industry-Standard Packaging
Surface-mount SOT-23 (3 or 5 pin)
TO92 package
DFN package (coming soon)
Hall Hall
Si7211/17 Si7212/13/14/15
Element Element
ADC ADC
DIS (Optional) DIS (Optional)
Control Logic VOUT Control Logic
PWM/SENT OUT
Temp / Offset / Temp / Offset /
ALERT/BIST ALERT/BIST
Reg Mechanical Stress Reg Mechanical Stress
VDD VDD
(OPTIONAL) (OPTIONAL)
Compensation Compensation
GND
GND
silabs.com | Building a more connected world. Rev. 1.3 Table of Contents
1. Electrical Specifications ...........................3
2. Functional Description............................9
3. Analog Output.............................. 10
4. PWM Output Description .......................... 11
5. SENT Output .............................. 12
5.1 tSENT Status Nibble............................12
5.2 SENT Data Nibbles ............................13
5.3 CRC Calculation .............................13
5.4 SENT Pause Pulse ............................13
5.5 SENT Frame Rate.............................13
5.6 BIST Activation During SENT Operation .....................13
6. Pin Description .............................14
7. Ordering Guide .............................16
8. Package Outline ............................. 18
8.1 SOT23 3-Pin Package ...........................18
8.2 SOT23-5 5-Pin Package...........................20
8.3 TO92S 3-Pin Package ...........................22
9. Land Patterns .............................. 23
9.1 SOT23 3-Pin PCB Land Pattern ........................23
9.2 SOT23-5 5-Pin PCB Land Pattern .......................24
10. Top Marking .............................. 25
10.1 SOT23 3-Pin Top Marking .........................25
10.2 SOT23-5 5-Pin Top Marking.........................26
10.3 TO92 Top Marking ............................26
11. Revision History............................. 27
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