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AH8503

HIGH ACCURACY MICROPOWER LINEAR HALL EFFECT SENSOR


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AH8503 pdf
AH8503
HIGH ACCURACY MICROPOWER
LINEAR HALL EFFECT SENSOR
Description
The AH8503 is a high accuracy, 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)
AH8503 is a trimmed device with typical sensitivity of 2.25mV/G and
3.8mV/G at 1.8V and 3V respectively with an accuracy of 3% at
+25°C. The device has a 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 AH8503
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 a continuous 6.25kHz
sample rate, the current consumption is 1mA typical. In external-drive
mode, the CNTRL be 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 AH8503 are available in small low profile
U-DFN2020-6.
Features
High Accuracy Linear Hall Effect Sensor with +/-400G Sense
Range and Output Voltage with 8-bit resolution
Supply Voltage of 1.6V to 3.6V
High Accuracy: Trimmed Sensitivity of 2.225mV/G and 3.8mV/G
at 1.8V and 3V respectively with accuracy of 3% at +25°C.
Low Offset Voltage
Micropower (Default), 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)
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.
AH8503
Document number: DS37684 Rev. 1 - 2
1 of 19
www.diodes.com
February 2015
© Diodes Incorporated



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AH8503 pdf
Typical Applications Circuit
AH8503
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
Package: U-DFN2020-6
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 selects the modes of operation (Micropower Mode, Turbo
Mode and External-Drive Mode) and adjusts 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
In External Drive Mode, an external PWM signal can be used to drive the
CNTRL pin to adjust the sampling frequency form 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
recommended 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.
Note:
5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
AH8503
Document number: DS37684 Rev. 1 - 2
2 of 19
www.diodes.com
February 2015
© Diodes Incorporated



Part Number AH8503
Description HIGH ACCURACY MICROPOWER LINEAR HALL EFFECT SENSOR
Maker Diodes - Diodes
Total Page 19 Pages
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