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PDF AH8502 Data sheet ( Hoja de datos )
| Número de pieza | AH8502 | |
| Descripción | MICROPOWER LINEAR HALL EFFECT SENSOR | |
| Fabricantes | Diodes | |
| Logotipo |  |
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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
1 page  
AH8502
Electrical Characteristics (Cont.) (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
CNTRL pin timing, conversion rate and IDD supply current relationship
AH8502 CNTRL Pin Driven Externally – External Drive Mode
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
ten
EN
TCONV
OUT
Tclk
DATA0
DATA1
Status
AWAKE(ON)
SLEEP
AWAKE(ON)
SLEEP
ICC
1.35 mA
8.9µA
1.35 mA
8.9µA
Status: AWAKE: chip processing phase (12*Tclk) ,
SLEEP: chip retain data
Tclk: internal clock period, typical = 10µs
ten : pulse width of enable signal, minimum=2*Tclk= 20µs (typical)
TCONV: One sample/conversion cycle = 14*Tclk= 140µs (typical)
IDD ( @ VDD = 1.8V, 25oC):
(1) If CNTRL pin clocked at maximum (~7.14 kHz): IDD = 1.35mA*12/14+8.93µA*2/14 ≈ 1.16mA
(2) If CNTRL pin clocked at 24Hz: IDD ≈ 13µA
(3) If CNTRL clocking period =T, IDD = 1.35mA*120µs/T + 8.93µA*(T-120µs)/T
AH8502 CNTRL = GND or Logic Low (0) Continuously – Micropower Mode
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110
EN TS=4096*Tclk
OUT
DATA0
DATA1
Status
AWAKE(ON)
SLEEP
AWAKE(ON)
SLEEP
ICC 1.35 mA
8.9µA
1.35 mA
8.9µA
Tclk: internal clock period, typical= 10µs
TS: awake cycle time = 4096*Tclk ≈ 41ms
AH8502 CNTRL = VDD or Logic High Continuously – Turbo Mode
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
EN
OUT Tclk
TCONV
DATA0
Status
AWAKE(ON)
SLEEP
AWAKE(ON)
ICC
1.35 mA
8.9µA
Tclk: internal clock period, typical= 10µs
TCONV: One sample/conversion period when ENABLE = Hugh (VDD )= 16*Tclk=160µs
IDD ( @ VDD = 1.8V, 25oC):
IDD = 1.35mA*120µs/160µs + 8.93µA*40µs/160µs ≈ 1.01mA (typical)
1.35 mA
DATA1
SLEEP
8.9µA
AH8502
Document number: DS37683 Rev. 1 - 2
5 of 19
www.diodes.com
February 2015
© Diodes Incorporated
5 Page 
AH8502
Typical Operating Characteristics
Average Supply Current
Micropower Mode (Default) – 24Hz Sample Rate
24.0
22.0 Micropower Mode, CNTRL = GND, TA = +25 C,
20.0
18.0
16.0
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 3.8
Supply Voltage (V)
Average Supply Current (CNTRL= GND) vs Supply Voltage
Micropower Mode (Default)
24.0
22.0 Micropower Mode, CNTRL = GND
20.0
18.0
16.0
14.0
3.6V
3.3V
3.0V
2.5V
12.0 1.8V
10.0 1.6V
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
Temperature (oC)
Average Supply Current (CNTRL = GND) vs Temperature
Turbo Mode – 6.25kHz Sample Rate
2.4
2.2 Turbo Mode, CNTRL = VDD , TA = +25 C
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8
Supply Voltage (V)
Average Supply Current (CNTRL = VDD) vs Supply Voltage
Turbo Mode – 6.25kHz Sample Rate
2.8
2.6
Turbo Mode, CNTRL = VDD
2.4
2.2
3.6V
3.3V
2.0 3.0V
1.8
1.6 2.5V
1.4
1.2
1.0
1.8V
0.8 1.6V
0.6
0.4
0.2
0.0
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature (oC)
Average Supply Current (CNTRL = VDD) vs Temperature
External Drive Mode with 7.14kHz Sampling Rate
2.4
2.2
Externally Driven, CNTRL = 20µs pulse 7.14kHz PWM, TA = +25 C
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8
Supply Voltage (V)
Average Supply Current (CNTRL = PWM) vs Supply Voltage
External Drive Mode with 7.14kHz Sampling Rate
2.8
2.6
Externally Driven, CNTRL = 20µs pulse 7.14kHz PWM
2.4
2.2 3.6V
2.0
1.8
3.3V
3.0V
2.5V
1.6
1.4 1.8V
1.2 1.6V
1.0
0.8
0.6
0.4
0.2
0.0
-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature (oC)
Average Supply Current (CNTRL = PWM) vs Temperature
AH8502
Document number: DS37683 Rev. 1 - 2
11 of 19
www.diodes.com
February 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AH8502.PDF ] | |
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