AH8501

AH8501
HIGH ACCURACY LOW POWER / MICROPOWER
LINEAR HALL EFFECT SENSOR
PRELIMINARY - CONFIDENTIAL
Description
Pin Assignments
The AH8501 is a high accuracy, low power/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.
(Top View)
AH8501 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 AH8501
can operate over the supply range of 1.6V to 3.6V and uses an
externally controlled ENABLE pin clocking system to control operating
modes and sampling rates to minimize the power consumption. The
typical average operating supply current is between 8.9µA during
sleep mode and 1.16mA at maximum sampling rate at 1.8V. With a
conversion pulse every 50ms at the ENABLE pin, the device achieves
a micropower operation with the power consumption of 22µW typical
at 1.8V supply.
To minimize PCB space the AH8501 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 2.25mV/G and 3.8mV/G
at 1.8V and 3V Respectively with Accuracy of 3% at +25°C
Low Offset Voltage
Low Average Supply Current
8.9µA Typical in Sleep Mode (Default) at 1.8V
1.01mA Typical in Auto-Run Mode (6.25kHz) at 1.8V
12µA Typical in External Drive Mode with 20Hz Sample
Rate at 1.8V
1.16mA Typical in External Drive Mode with 7.14kHz
Sample 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)
Notes:
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
Contact-Less Level, Proximity and Position Measurement in
Home Appliances and Industrial Applications
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.
AH8501
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AH8501
PRELIMINARY - CONFIDENTIAL
Typical Applications Circuit
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
Pin Name
1
OUTPUT
2
NC
3
VDD
Function
Output Pin
No Connection (Note 5)
Power Supply Input
Device “Awake” and “Sleep” control pin:
An external PWM signal to the ENABLE pin controls the operating modes
(Sleep Mode, Auto-Run Mode and External Drive Mode), awake and sleep
periods to adjust the sampling rate and to minimize the power consumption
to achieve micropower operation.
When the ENABLE = GND continuously the device is in sleep mode
consuming only 8.9µA typical at 1.8V. When the ENABLE pin is left floating,
the device defaults to sleep mode. The ENABLE pin is internally pulled low.
4
ENABLE
When ENABLE = VDD (or Logic High) continuously, device is in auto-run
mode with sampling rate of 6.25kHz typical consuming 1.01mA at 1.8V
In external drive mode, an external PWM signal can be used to drive the
ENABLE pin to adjust the sampling frequency up to 7.14kHz typical.
A minimum pulse width needed on ENABLE pin to start one Awake/Sleep
cycle (i.e. one sample/conversion cycle) is 20µs typical. We recommended
using a pulse width of 40µs minimum. The minimum awake period for one
sample/conversion cycle is140µs typical.
Note:
5
GND
6
NC
No Connection (Note 5)
Pad
Pad
The center exposed pad – No connection internally.
The exposed pad can be left open (unconnected) or tied to the GND on the
PCB layout.
Ground Pin
5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
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AH8501
PRELIMINARY - CONFIDENTIAL
Functional Block Diagram
AH8501
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AH8501
Absolute Maximum Ratings (Note 6) (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
PRELIMINARY - CONFIDENTIAL
VDD and VOUT Supply Voltage and Output Voltage (Note 7)
VDD_REV and
VOUT_REV
Reverse Supply and Output Voltage
Output Current (limited by 10kOhms output resistor)
IOUT
B
Magnetic Flux Density Withstand
PD
Package Power Dissipation
Ts
Storage Temperature Range
TJ
Maximum Junction Temperature
ESD HBM
Notes:
Rating
Unit
4
V
-0.3
V
VDD/10
mA
Unlimited
U-DFN2020-6
230
Human Body Model (HMB) ESD Capability
mW
-65 to +150
°C
150
°C
6
kV
6. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
7. The absolute maximum VDD of 4V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to
operate the device at the absolute maximum rated conditions for any period of time.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
TA
Parameter
Conditions
Rating
Unit
Supply Voltage
Operating
1.6V to 3.6V
V
Operating Temperature Range
Operating
-40 to +85
°C
Electrical Characteristics (Notes 8 & 9) (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ
Max
-
1.35
1.7
-
1.92
2.4
Unit
Supply Current
VOUTPUT = VDD/2, ENABLE = VDD, VDD = 1.8V
IDD_AWAKE
Supply Current in Awake Period
(Note 10)
(During “Awake” Period)
VOUTPUT = VDD/2, ENABLE = VDD, VDD = 3V
(Note 10)
IDD_SLEEP
IDD_20Hz
Supply Current in Sleep Mode
VOUTPUT = VDD/2, ENABLE = GND, VDD = 1.8V
-
8.93
15
(During ‘Sleep’ Period)
VOUTPUT = VDD/2, ENABLE = GND, VDD = 3V
-
11.1
18
Average Supply Current at 20Hz
VOUTPUT = VDD/2, ENABLE clocking at 20Hz
frequency, VDD = 1.8V (Note 10)
-
12.1
20
µA
VOUTPUT = VDD/2, ENABLE clocking at 20Hz
frequency, VDD = 3V (Note 10)
-
15.7
25
µA
VOUTPUT = VDD/2, ENABLE clocking at 7.14kHz,
VDD = 1.8V (Note 10)
-
1.16
1.5
mA
Sample Rate
VOUTPUT = VDD/2, ENABLE clocking at 7.14kHz,
VDD = 3V (Note 10)
-
1.65
2.1
mA
Average Supply Current in Auto-Run
Mode when ENABLE = Logic High
(or VDD) Continuously
VOUTPUT = VDD/2, ENABLE = VDD, VDD = 1.8V
-
1.01
1.3
mA
(The sampling frequency when
ENABLE = High continuously is
6.25kHz)
VOUTPUT = VDD/2, ENABLE = VDD, VDD = 3V
-
1.44
1.8
mA
Sample Rate
IDD_7kHz
IDD_AUTORUN
Notes:
mA
Average Supply Current at 7.14kHz
(Note 10)
(Note 10)
µA
8. When power is initially turned on, the operating VDD (1.6V to 3.6V) must be applied to guarantee the output sampling.
After the supply voltage reaches minimum operating voltage, the output state is valid after 140us after the ENABLE pin pulled or clocked high.
9. Typical data is at TA = +25°C, VDD = 1.8V unless otherwise stated.
10. The parameters are not tested in production, they are guaranteed by design, characterization and process control.
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AH8501
Electrical Characteristics (cont) (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
PRELIMINARY - CONFIDENTIAL
ENABLE Pin Timing, Conversion Rate and IDD Supply Current Relationship
AH8501
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Electrical Characteristics (cont.) (Notes 11, 12 & 13) (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
PRELIMINARY - CONFIDENTIAL
Symbol
tON_INITIAL
ten
TCONV
fMAX
Parameter
Min
Typ
Max
Unit
VDD = 1.8V, TA = +25°C, CIN=0.1uF,
VDD rise time =10us,
(Note 14)
-
1
-
ms
VDD = 3V, TA = +25°C, CIN=0.1uF,
VDD rise time =10us,
(Note 14)
-
0.2
-
ms
Minimum Pulse Width on ENABLE
Pin To Start One Conversion Cycle
When Driving ENABLE pin
Externally
(See application note section)
VDD = 1.6V to 3.6V, TA = -40°C to +85°C
(Note 14)
-
20
-
µs
Minimum Period of One
Sample/Conversion Cycle
VDD = 1.6V to 3.6V, TA = -40°C to +85°C
(Note 14)
100
140
200
µs
Maximum Sampling Frequency
VDD = 1.6V to 3.6V, TA = -40°C to +85°C,
(Note 14)
-
7.14
-
kHz
ENABLE = High (VDD),
VDD = 1.6V to 3.6V, TA = -40°C to +85°C
(Note 14)
-
6.25
-
kHz
Initial Power On Time
Sampling Frequency when
fEN_HIGH
ENABLE = Logic High (or VDD)
continuously.
VEN_LOW
VEN_HIGH
Enable pin input low voltage
Enable pin input high voltage
Conditions
VDD = 1.8V (Note 13)
0.4
0.5
0.6
V
VDD = 3.0V (Note 13)
0.8
0.9
1
V
VDD = 1.8V (Note 13)
1.2
1.3
1.4
V
VDD = 3V
2.2
2.3
2.4
V
ENABLE = VDD or GND,
VDD = 1.6V to 3.6V, TA = -40°C to +85°C,
(Note 14)
-
10
13
kΩ
CIN = Open, VDD = 1.8V, TA = +25°C,
-
0.36
-
G
CIN = Open, VDD = 3.0V, TA = +25°C,
-
0.24
-
G
8
-
Bit
(Note 13)
Output Characteristics
ROUT
DC Output Resistance
Noise_RMS
ADCRES
DACRES
VOUT_RES
Input Referred Noise, RMS (Note 14)
Internal ADC and DAC resolution
(Note 14)
-
Output Voltage Resolution
VDD = 1.6V to 3.6V, TA = -40°C to +85°C
-
VDD/256
-
mV
VOUTH
Max. Output Voltage
VDD = 1.6V to 3.6V, TA = -40°C to +85°C
-
VDD*255/256
-
V
VOUTL
Min. Output Voltage
VDD = 1.6V to 3.6V, TA = -40°C to +85°C
-
0
-
V
Notes:
11. When power is initially turned on, the operating VDD (1.6V to 3.6V) must be applied to guarantee the output sampling.
The output state is valid after tON_INITIAL from the supply voltage reaching the minimum operating voltage.
12. Typical data is at TA = +25°C, VDD = 1.8V unless otherwise stated.
13. Maximum and minimum parameters values over operating temperature range are not tested in production, they are guaranteed by design,
characterization and process control.
14. The parameter is not tested in production, they are guaranteed by design, characterization and process control.
AH8501
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AH8501
Electrical Characteristics (cont.) (Notes 11, 12 & 13) (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
PRELIMINARY - CONFIDENTIAL
Symbol
Parameter
Magnetic Characteristics
BRANGE
GRES
Measurable Magnetic Flux Density
Range
Gauss Resolution
Quiescent Output Voltage with zero
gauss
VNULL
VOFFSET
Quiescent Output Voltage Offset
Output Voltage Sensitivity
VSENS
VSENS_ACC
Sensitivity Accuracy
Conditions
Min
Typ
Max
Unit
VDD = 1.8V, TA =+25°C
±388
±400
±412
G
VDD = 3V, TA =+25°C
±382
±395
±408
G
VDD = 1.8V, TA =+25°C
3.033
3.125
3.221
G/LSB
VDD = 3V, TA =+25°C
2.994
3.084
3.179
G/LSB
B = 0.5G, TA = +25°C
-
VDD / 2
-
V
VDD = 1.8V, TA = +25°C
0.882
0.9
0.918
V
VDD = 3V, TA = +25°C
1.47
1.5
1.53
V
B = 0.5G, VDD = 1.8V, TA = +25°C
-1%
-
1%
% of VDD
B = 0.5G, VDD = 3V, TA = +25°C
-1%
-
1%
% of VDD
B = 0.5G, VDD = 1.6V to 3.6V,
TA = -40°C to +85°C
(Note 14)
-1.5
-
1.5
% of VDD
VDD = 1.8V, TA = +25°C
2.183
2.25
2.318
VDD = 3V, TA = +25°C
3.686
3.80
3.914
VDD = 1.8V, TA = +25°C
-3
-
3
%
VDD = 3V, TA = +25°C
-3
-
3
%
-6
-
6
%
-3
-
3
%
VDD = 1.8V, TA = +25°C (Note 14)
-
99.9
-
%
VDD = 3.0V, TA = +25°C (Note 14)
-
99.7
-
%
VDD = 1.8V, TA = +25°C (Note 14)
-
100.1
-
%
VDD = 3.0V, TA = +25°C (Note 14)
-
100.4
-
%
VDD = fixed at any one voltage between 1.6V
to 3.6V,
TA = -40°C to +85°C
(Note 14, Note 15)
TC_ERRSENS Sensitivity error over full temperature VDD=fixed, TA = -40°C to +85°C, (Note 14)
Lin+
Positive linearity (span linearity)
LinNotes:
Negative linearity (span linearity)
mV/G
11. When power is initially turned on, the operating VDD (1.6V to 3.6V) must be applied to guarantee the output sampling.
The output state is valid after tON_INITIAL from supply voltage reaching the minimum operating voltage.
12. Typical data is at TA = +25°C, VDD = 1.8V unless otherwise stated.
13. Maximum and minimum parameters values over operating temperature range are not tested in production, they are guaranteed by design,
characterization and process control.
14. The parameter is not tested in production, they are guaranteed by design, characterization and process control.
15. This term constitutes of output voltage sensitivity temperature coefficient error and sensitivity trim accuracy.
AH8501
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AH8501
Application Note
PRELIMINARY - CONFIDENTIAL
ENABLE Pin - Awake and Sleep Period Control
ENABLE pin controls the device’s “Awake” and “Sleep” periods and operating modes (Sleep, Auto-Run and External Drive modes).
When the ENABLE pin is pulled low (ENABLE = GND) continuously, the device enters sleep mode where the supply current is 8.93µA typical at
VDD = 1.8V (the output is 0.9V). The ENABLE pin is internally pulled low and therefore the default mode is the sleep mode if the ENABLE pin is
left floating.
When the ENABLE pin is pulled high (ENABLE = VDD or pulled high) the device enters auto-run mode with the conversion time TCONV of 16 clock
cycles (160µs typical) and therefore the sampling rate is 6.25kHz. The average supply current with the ENABLE pin pulled high continuously is
1.01mA at VDD = 1.8V.
In external drive mode, the sample rate can be controlled between 0 to 7.14kHz by clocking the ENABLE pin with an external PWM signal. The
minimum pulse width needed on the ENABLE pin to start sample/conversion is 20µs typical; we recommend using pulse width of 40µs minimum.
When the ENABLE pin is clocked, the conversion time (signal acquisition, conversion and output update) TCONV is 14 clock cycles (140µs
typical). When the ENABLE goes high, the sample trigger delay is 1 clock pulse (10µs) where supply current remains at 8.93µA typical at VDD =
1.8V. After the sample trigger delay, the next 12 clock pulse (120µs typical) is ‘Awake’ period where the typical supply current is 1.35mA at 1.8V
supply. The next pulse (10µs) is used to update the output stage and during this time the supply current drops back to 8.93µA typical at 1.8V
supply. Therefore, the average supply current while the device is at the maximum sampling rate of 7.14kHz is 1.16mA typical at 1.8V supply. At
a sampling rate of 20Hz, the supply current is 12µA typical at VDD = 1.8V achieving micropower operation.
For ENABLE pin clocking period of T, the average current is given by
DD = DD = .
×.
×
(@ 1.8V)
_ ×_ ×
(General equation)
Quiescent Output Voltage VNULL and Offset Voltage
The figure below shows the ideal transfer curve near zero magnetic field (B = 0Gauss). Zero Gauss is the transition point between
VOUTPUT = VDD*127/128 and VOUTPUT = VDD/2. When B is slightly larger than zero, the output is one-half the supply voltage typically.
Quiescent output voltage (VNULL) is defined as the typical output voltage when B = 0.5Gauss (slightly higher than 0G). Any difference of VNULL
from VDD/2 introduces offset (VOFSET).
Transfer Curve Near 0 Gauss
AH8501
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AH8501
Sensitivity and Transfer Characteristic
The device responds to the magnetic flux density perpendicular to the part marking surface. For South pole magnetic flux density increase from
0G, the output voltage will increase from VNULL and for a North magnetic pole field, the output will decrease from VNULL. The changes in the
voltage level up or down are symmetrical to VNULL and are proportional to the magnetic flux density.
The output voltage change is proportional to the magnitude and polarity of the magnetic field perpendicular to the part marking surface. This
proportionality is defined as output voltage sensitivity and is given by
!SENS = !OUTB_MAX − !OUTB_MIN
.MAX − .MIN
The AH8501 has a measurable magnetic field range of +/-400G and output voltage range of 0V to (255/256)VDD. Therefore sensitivity at 1.8V is
given by
1.8!
!SENS_1.8V = = 2.256!/3
8003
The device has an internal ADC and DAC with a resolution of 8-bits. Therefore, the measurement resolution is 3.125G/LSB at VDD = 1.8V. In
terms of voltage, the output resolution at 1.8V is 7mV/LSB typical. The device follows the 8-bit step for transfer curve superimposed on the
VSENS above. This difference in theoretical linear value with 8-bit resolution steps produces a measurement (quantization) error at each step.
Quantization error (also measurement error) = 0.5*step = VDD/512(output voltage), OR
= Full magnetic range/512 (input magnetic field)
Output Voltage VOUTPUT (V)
PRELIMINARY - CONFIDENTIAL
Application Note (continued)
3.9
3.6 TA
3.3
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0.0
-500
= +25 °C
3.6V
3.3V
3.0V
1.8V
1.6V
-400
-300
-200
-100
0
100
200
300
400
500
Magnetic Flux Density, B (Gauss)
Transfer Curve – Output Voltage vs. Magnetic Flux Density
AH8501
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PRELIMINARY - CONFIDENTIAL
Application Note (cont.)
Span Linearity
The coordinate of transition points (V0~V255 and B0~B254) can be extracted from a transfer curve. Span linearity is defined and based on these
coordinate points.
Span linearity is defined as linearity arising from sensitivity differences between the maximum flux density range and half of the range for positive
and negative flux density. Referring to the diagram below, north field span linearity LIN- and south field span linearity LIN+ are given by
89−=
89+=
AH8501
Document number: DS37512 Rev. 1 - 2
!0 − !127/.0 − .127
!64 − !127/.64 − .127
!254 − !127/.254 − .127
!190 − !127/.190 − .127
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AH8501
Typical Operating Characteristics
Average Supply Current
Average Supply Current IDD (µA)
Avgerage Supply Current IDD_SLEEP (µA)
16.0
Sleep Mode
ENABLE = GND, TA = +25 °C,
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
16.0
ENABLE = GND
14.0
12.0
3.6V
3.3V
3.0V
2.5V
1.8V
1.6V
10.0
8.0
6.0
4.0
2.0
0.0
-50
3.8
-40
-30
-20
-10
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
Average Supply Current IDD (µA)
Average Supply Current IDD_20Hz (µA)
ENABLE = 140µs pulse 20Hz PWM, TA = +25 °C
1.6
30
40
50
60
70
80
90
External Drive Mode - 20Hz Sample Rate
18.0
1.4
20
Average Supply Current (ENABLE = GND) vs Temperature
External Drive Mode - 20Hz Sample Rate
20.0
10
Temperature ( C)
Supply Voltage (V)
22.0
0
o
Average Supply Current (ENABLE = GND) vs Supply Voltage
22.0
ENABLE = 140µs pulse 20Hz PWM
20.0
18.0
3.6V
3.3V
3.0V
2.5V
16.0
14.0
12.0
1.8V
1.6V
10.0
8.0
6.0
4.0
2.0
0.0
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
Supply Voltage (V)
Temperature (oC)
Average Supply Current (ENABLE = PWM) vs Supply Voltage
Average Supply Current (ENABLE = PWM) vs Temperature
Auto-Run Mode - 6.25kHz Sampling Rate
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Auto-Run Mode Mode - 6.25kHz Sample Rate
ENABLE = VDD , TA = +25 °C
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
Average Supply Current IDD (mA)
Average Supply Current IDD (mA)
PRELIMINARY - CONFIDENTIAL
Sleep Mode
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
ENABLE = VDD
3.6V
3.3V
3.0V
2.5V
1.8V
1.6V
-50
-20
-10
0
10
20
30
40
50
60
70
80
90
Average Supply Current (ENABLE = VDD) vs Temperature
Average Supply Current (ENABLE = VDD) vs Supply Voltage
Document number: DS37512 Rev. 1 - 2
-30
Temperature (oC)
Supply Voltage (V)
AH8501
-40
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Typical Operating Characteristics (continued)
CIN = 0.1µF, VDD rise time 10µs, TA = +25 °C
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
Initial Power On Time tON_INITIAL (ms)
Initial Power On Time tON_INITIAL (ms)
5.0
18.0
CIN = 0.1µF, VDD rise time 10µs
16.0
1.6V
14.0
12.0
10.0
8.0
6.0
1.8V
4.0
2.0
2.5V 3.0V 3.3
V
0.0
-50
-40
-30
3.6
V
-20
-10
0
10
20
30
40
50
60
70
80
90
Temperature (oC)
Supply Voltage (V)
Initial Power On Time vs Temperature
Initial Power On Time vs Supply Voltage
Typical Sensitivity
5.0
5.0
Sensitivity (mV/Gauss)
Sensitivity (mV/Gauss)
5.5
TA = +25 °C
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
3.6V
4.5
3.3V
4.0
3.0V
3.5
2.5V
3.0
2.5
1.8V
1.6V
2.0
1.5
1.0
0.5
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
-50
-40
-30
-20
-10
0
10
20
30
40
Supply Voltage (V)
Temperature (oC)
Sensitivity vs Supply Voltage
Sensitivity vs Temperature
50
60
70
80
90
50
60
70
80
90
4.00
2.40
VDD = 1.8V
VDD = 3.0V
2.35
Sensitivity (mV/Gauss)
Sensitivity (mV/Gauss)
PRELIMINARY - CONFIDENTIAL
Typical Initial Power On Time
2.30
1.8V
2.25
2.20
2.15
2.10
3.90
3.0V
3.80
3.70
3.60
3.50
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
-50
o
-40
-30
-20
-10
0
10
20
30
40
Temperature ( C)
Temperature (oC)
Sensitivity vs Temperature
Sensitivity vs Temperature
AH8501
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Typical Operating Characteristics (cont.)
1.8V
1.6V
-400
-300
-200
-100
0
100
200
300
400
VDD = 1.6V, TA = -40 °C to +85 °C
1.4
-40C
1.2
1.0
0C
0.8
25C
0.6
85C
0.4
0.2
-400
-300
-200
-100
0
100
200
300
Magnetic Flux Density, B (Gauss)
Magnetic Flux Density, B (Gauss)
Output Voltage vs Magnetic Flux Density
Output Voltage vs Magntic Flux Density
3.5
1.6
1.4
-40C
1.2
0C
1.0
25C
0.8
0.6
85C
0.4
0.2
-400
1.6
0
-500
500
VDD = 1.8V, TA = -40 °C to +85 °C
0
-500
Output Voltage VOUTPUT (V)
3.6V
3.3V
3.0V
-300
-200
-100
0
100
200
300
400
Output Voltage VOUTPUT (V)
Output Voltage VOUTPUT (V)
1.8
1.8
= +25 °C
2.5
-40C
2.0
0C
1.5
25C
1.0
85C
0.5
-400
-300
-200
-100
0
100
200
300
Magnetic Flux Density, B (Gauss)
Magnetic Flux Density, B (Gauss)
Output Voltage vs Magntic Flux Density
-40C
0C
25C
85C
100
200
300
400
500
3.9
VDD = 3.6V, TA = -40 °C to +85 °C
3.6
3.3
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
-500 -400 -300 -200 -100
0
25C
85C
100
200
300
Output Voltage vs Magntic Flux Density
Output Voltage vs Magntic Flux Density
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500
0C
Magnetic Flux Density, B (Gauss)
Document number: DS37512 Rev. 1 - 2
400
-40C
Magnetic Flux Density, B (Gauss)
AH8501
500
VDD = 3.0V, TA = -40 °C to +85 °C
Output Voltage vs Magntic Flux Density
3.6
VDD = 3.3V, TA = -40 °C to +85 °C
3.3
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
-500 -400 -300 -200 -100
0
400
3.0
0
-500
500
Output Voltage VOUTPUT (V)
Output Voltage VOUTPUT (V)
3.9
3.6 TA
3.3
3.0
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0.0
-500
2.0
Output Voltage VOUTPUT (V)
PRELIMINARY - CONFIDENTIAL
Typical Transfer Curves
400
500
February 2015
© Diodes Incorporated
AH8501
Typical Operating Characteristics (cont.)
2.1
B = 0+ Gauss, TA = +25 °C
1.8
1.9
1.6
1.7
Null Voltage (V)
Null Voltage (V)
2.0
1.4
1.2
1.0
0.8
B = 0+ Gauss
3.6V
3.3V
1.5
3.0V
1.3
2.5V
1.1
1.8V
0.9
1.6V
0.7
0.6
0.5
0.4
0.3
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
-50
-40
-30
-20
-10
30
40
50
60
70
80
90
50
60
70
80
90
B = 0+ Gauss, VDD = 3.0V
1.53
1.52
Null Voltage (V)
0.910
0.905
1.8V
0.895
0.890
0.885
1.51
1.50
3.0V
1.49
1.48
1.47
1.46
1.45
0.880
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
-50
-40
-30
-20
-10
0
10
20
30
40
o
Temperature (oC)
Temperature ( C)
Null Voltage vs Temperature
Null Voltage vs Temperature
Note:
20
1.54
B = 0+ Gauss, VDD = 1.8V
0.915
0.900
10
Null Voltage vs Temperature
Null Voltage vs Supply Voltage
0.920
0
Temperature (oC)
Supply Voltage (V)
Null Voltage (V)
PRELIMINARY - CONFIDENTIAL
Typical Null Voltage: Output Voltage at B = 0+ Gauss (Note 16)
16. Null voltage is the voltage with magnetic flux density B = 0G at the sensor. B = 0G is also the transistion point at VDD*127/128 for internal ADC and
DAC. To avoid the transition point fluctuation during measurement of null voltage, B = 0+ Gauss (e.g. 0.5G which is smaller than the 1LSB gauss step
of 3.125G) is used. See definition of the null voltage in application section.
AH8501
Document number: DS37512 Rev. 1 - 2
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AH8501
Typical Operating Characteristics (cont.)
10.0
B = 0+ Gauss, TA = +25 °C
Null Voltage Offset (mV)
Null Voltage Offset (mV)
8.0
6.0
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-12.0
-14.0
B = 0+ Gauss
1.6V
1.8V
2.5V
3.0V
3.3V
3.6V
-50
3.8
-40
-30
-20
-10
Null Voltage Offset (mV)
B = 0+ Gauss, VDD = 1.8V
3.0
1.0
1.8V
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-12.0
-14.0
30
40
50
60
70
80
90
60
70
80
90
B = 0+ Gauss, VDD = 3.0V
3.0V
-50
o
-40
-30
-20
-10
0
10
20
30
40
50
o
Temperature ( C)
Temperature ( C)
Null Voltage Offset vs Temperature
Note:
20
Null Voltage Offset vs Temperature
5.0
2.0
10
Temperature ( C)
Null Voltage Offset vs Supply Voltage
4.0
0
o
Supply Voltage (V)
Null Voltagte Offset (mV)
PRELIMINARY - CONFIDENTIAL
Typical Null Voltage Offset: (Output Voltage - VDD/2) at B = 0+ Gauss (Note 16)
Null Voltage Offset vs Temperature
16. Null voltage is the voltage with magnetic flux density B = 0G at the sensor. B = 0G is also the transistion point at VDD*127/128 for internal ADC and
DAC. To avoid the transition point fluctuation during measurement of null voltage, B = 0+ Gauss (e.g. 0.5G which is smaller than the 1LSB gauss step
of 3.125G) is used. See definition of the null voltage in application section.
AH8501
Document number: DS37512 Rev. 1 - 2
15 of 19
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AH8501
PRELIMINARY - CONFIDENTIAL
Ordering Information
Part Number
Package
Code
Packaging
AH8501-FDC-7
FDC
U-DFN2020-6
Quantity
7” Tape and Reel
Part Number Suffix
3,000/Tape & Reel
-7
Marking Information
(1)
Package Type: U-DFN2020-6
AH8501
Document number: DS37512 Rev. 1 - 2
Part Number
Package
Identification Code
AH8501-FDC-7
U-DFN2020-6
KR
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AH8501
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.
PRELIMINARY - CONFIDENTIAL
(1)
Package Type: U-DFN2020-6
A1
A
A3
Seating Plane
D
D2
Pin #1 ID
E
E2
Z(4x)
U-DFN2020-6
Type C
Dim
Min
Max
Typ
A
0.57
0.63
0.60
A1
0.00
0.05
0.02
A3
0.15
b
0.25
0.35
0.30
D
1.95 2.075 2.00
D2
1.55
1.75
1.65
E
1.95 2.075
2.0
E2
0.86
1.06
0.96
e
0.65
L
0.25
0.35
0.30
Z
0.20
All Dimensions in mm
L
b
e
Bottom View
Sensor Location (TBD)
AH8501
Document number: DS37512 Rev. 1 - 2
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AH8501
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
Package Type: U-DFN2020-6
PRELIMINARY - CONFIDENTIAL
(1)
X2
X1
Dimensions Value (in mm)
C
0.650
X
0.350
X1
1.650
X2
1.700
Y
0.525
Y1
1.010
Y2
2.400
Y
Y2
Y1
X
AH8501
Document number: DS37512 Rev. 1 - 2
C
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AH8501
IMPORTANT NOTICE
PRELIMINARY - CONFIDENTIAL
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
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representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2015, Diodes Incorporated
www.diodes.com
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