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AH8502

MICROPOWER LINEAR HALL EFFECT SENSOR


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AH8502 pdf
AH8502
MICROPOWER
LINEAR HALL EFFECT SENSOR
Description
The AH8502 is a micropower linear Hall effect sensor with an 8-bit
output resolution. The output voltage is ratiometric to the supply
voltage and proportional to the magnetic flux density, perpendicular to
the part marking surface. The output null voltage is at half the supply
voltage.
Pin Assignments
(Top View)
OUTPUT 1
6 NC
The AH8502 has a typical sensitivity of 2.1mV/G and 3.55mV/G at
1.8V and 3V. The typical null voltage offset is less than 1% of VDD.
The device has typical input referred rms noise of 0.36G and 0.24G at
1.8V and 3.0V.
Designed for battery powered consumer equipment to office
equipment, home appliances and industrial applications, the AH8502
can operate over the supply range of 1.6V to 3.6V. The device has a
CNTRL pin to select the operating modes and sampling rate to
minimize power consumption. The device operates in default
micropower mode with a sampling rate of 24Hz typical and consumes
only 13µA typical at 1.8V. In turbo mode with continuous 6.25kHz
sample rate the current consumption is 1mA typical. In external-drive
mode, the CNTRL can be used to change the sampling frequency up
to 7.14KHz with current consumption of 1.16mA typical at 1.8V.
To minimize PCB space, the AH8502 is available in small low profile
U-DFN2020-6.
Features
Linear Hall Effect Sensor with +/-430G Sense Range and Output
Voltage with 8-bit Resolution
Supply Voltage of 1.6V to 3.6V
Sensitivity: 2.1mV/G and 3.55mV/G at 1.8V and 3V at +25°C
Low Offset Voltage
Micropower (Default Mode), Turbo and External-Drive Modes
Ultra Low Average Supply Current
13µA Typical in Micropower Mode (Default) Period at 1.8V
1.01mA Typical in Turbo Mode at 1.8V
1.16mA Typical in External Drive Mode with 7.14kHz
Sampling Rate at 1.8V
Chopper Stabilized Design with Superior Temperature Stability,
Minimal Sensitivity Drift, Enhanced Immunity to Physical Stress
Output Voltage Maintained at „Sleep‟ Mode
-40°C to +85°C Operating Temperature
High ESD Capability of 6kV Human Body Model
Small Low Profile U-DFN2020-6 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
NC 2
5 GND
VDD 3
Exposed
Pad
4 CNTRL
U-DFN2020-6
Applications
High Accuracy Level, Proximity, Position and Travel Detection
Button Press Detection in Digital Still, Video Cameras and
Handheld Gaming Consoles
Accurate Door, Lids and Tray Position Detection
Liquid Level Detection
Joy Stick Control Gaming and Industrial Applications
Smart Meters
Contact-Less Level, Proximity and Position Measurement in
Home Appliances and Industrial Applications
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated‟s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AH8502
Document number: DS37683 Rev. 1 - 2
1 of 19
www.diodes.com
February 2015
© Diodes Incorporated



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AH8502 pdf
Typical Applications Circuit
CIN
VDD
AH8502
CNTRL
OUTPUT
GND
AH8502
Note:
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical and should be placed as close to the
supply pin as possible.
Pin Descriptions
Pin Number
1
2
3
Pin Name
OUTPUT
NC
VDD
Function
Output Pin
No Connection (Note 5)
Power Supply Input
Device Control Pin:
The CNTRL pin allows to select the modes of operation (Micropower Mode, Turbo Mode and
External-Drive Mode) and to adjust the sampling rate in External Drive Mode to minimize the power
consumption.
When CNTRL = GND or floating, the device operates in default Micropower Mode with 24Hz
sampling rate and consumes 13µA typical at 1.8V. The CNTRL pin is internally pulled low.
4 CNTRL
When CNTRL = VDD, the device is on and operates in Turbo Mode with continuous sampling rate of
6.25kHz typical consuming 1.01mA typical at 1.8V.
Note:
In External Drive Mode, an external PWM signal can be used to drive the CNTRL pin to adjust the
sampling frequency from 24Hz typical up to 7.14kHz typical. If external PWM pulse is used, the
minimum pulse width needed on the CNTRL pin to start a sample/conversion is 20µs typical. We
recommend using a pulse width of 40µs minimum. The minimum sample and conversion cycle
is140µs typical.
5
GND
Ground Pin
6 NC No Connection (Note 5)
The center exposed pad No connection internally.
Pad Pad
The exposed pad can be left open (unconnected) or tied to the GND on the PCB layout.
5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
AH8502
Document number: DS37683 Rev. 1 - 2
2 of 19
www.diodes.com
February 2015
© Diodes Incorporated



Part Number AH8502
Description MICROPOWER LINEAR HALL EFFECT SENSOR
Maker Diodes - Diodes
Total Page 19 Pages
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