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PDF A1174 Data sheet ( Hoja de datos )
| Número de pieza | A1174 | |
| Descripción | Ultrasensitive Hall Effect Latch | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A1174 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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A1174
Ultrasensitive Hall Effect Latch
with Internally or Externally Controlled Sample and Sleep Periods
for Track Ball and Scroll Wheel Applications
Features and Benefits
www.da▪taMshicereot4-up.ocwomer latch operation
▪ 1.65 to 3.5 V battery operation
▪ Push-pull output eliminates the need for an external pull-
up resistor
▪ User configured, internally or externally controlled sample
and sleep periods
▫ Floating the two clock pins results in the use of a fixed
sampling clock internal to the sensor
▫ Toggling the clock pins allows the user to control the
sampling and sleep times of the sensor for extreme low
power operation
▪ External control of the clock pins allows the user to
implement synchronous sampling of multiple sensors in
direction detection systems
▪ Chopper stabilization
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
▪ Solid state reliability
▪ Small size
Package: 6-contact MLP/DFN (suffix EW)
1.5 mm × 2 mm × 0.40 mm
Description
TheA1174 is a micro-power, Hall-effect latch for use in portable
devices that employ rotational detection systems, and have a
power supply voltage between 1.65 and 3.5 V. The device has
a single push-pull output structure and requires no external
pull-up resistor for reliable operation.
When a sufficient positive magnetic field is present on the
device, the device output transitions to the low state and is
latched in this state until a negative field of sufficient strength
latches the device output into the high state. The latched output
is ideal when using multiple sensors in rotational speed and
direction sensing systems (for example, track ball and scroll
bar systems in portable devices).
The device includes an innovative clocking scheme that
satisfies the micro-power needs of almost any application,
including track balls for PDAs and cell phones. Using the
EXTERNAL_CLK and DUAL_CLK pins as described in this
datasheet, the device can be set into various working modes.
In Dual Clock mode, the device switches between predefined
slow and fast sampling rates. The average current consumption
of the device is extremely low when rotation is not detected.
In External Clock mode, the user sets the clock rate for the
device to achieve the required on and off times for controlling
average power. This user-determined clocking also helps to
Not to scale
Continued on the next page…
A1174-DS
+B
Magnetic Flux
Density 0
–B
+V
A1174 Output
BOP
BRP
BOP
BRP
BOP
BRP
On Off On Off On
Figure 1. Timing diagram for output switching
1 page  
A1174
Ultrasensitive Hall Effect Latch
with Internally or Externally Controlled Sample and Sleep Periods
for Track Ball and Scroll Wheel Applications
www.datasheet4u.com
Characteristic Performance
Saturation Voltage versus Temperature
300
Saturation Voltage versus Supply Voltage
300
250
200
150
100
50
0
-60 -40 -20
0 20 40
TA (°C)
IOUT = 1 mA
VDD (V)
1.65
1.8
2.5
2.75
3.0
3.5
60 80 100
250
IOUT = 1 mA
200 TA (°C)
150 85°C
-40°C
100 25°C
50
0
1.0
1.5
2.0 2.5 3.0
VDD (V)
3.5 4.0
100
90
80
70
60
50
40
30
20
10
0
-60
Average Supply Current versus Temperature
VDD (V)
1.65
1.8
2.5
3.0
3.5
-40 -20 0 20 40 60 80 100
TA (°C)
1000
900
800
700
600
500
400
300
200
100
0
-60
Normal Mode Period versus Temperature
VDD (V)
1.65
1.8
2.5
3.0
3.5
-40 -20 0 20 40 60 80 100
TA (°C)
Average Supply Current versus Supply Voltage
100
90
80
70 TA (°C)
60 85°C
-40°C
50 25°C
40
30
20
10
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0
VDD (V)
Normal Mode Period versus Supply Voltage
1000
900
800
700
600
500
400
300
200
100
0
1.0
1.5 2.0
2.5 3.0
VDD (V)
3.5
TA (°C)
85°C
-40°C
25°C
4.0
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1174
www.datasheet4u.com
Ultrasensitive Hall Effect Latch
with Internally or Externally Controlled Sample and Sleep Periods
for Track Ball and Scroll Wheel Applications
50
0
-50
0
Off
1000
2000
3000
(ms)
4000
5000
6000
On
0
High
1000
2000
3000
(ms)
4000
5000
6000
Low
0
300
1000
2000
3000
(ms)
4000
5000
200
100
0
0
1000
2000
3000
4000
5000
(ms)
Figure 7. Device output response in Dual Clock mode with no change of the
magnetic field for the duration of ttimeout
6000
6000
50
0
-50
0
Off
1000
2000
3000
(ms)
4000
5000
6000
On
0
High
1000
2000
3000
(ms)
4000
5000
6000
Low
0
400
1000
2000
3000
(ms)
4000
5000
6000
200
0
0
1000
2000
3000
4000
5000
(ms)
Figure 8. Device output response in Dual Clock mode with a rapid change of the
magnetic field
6000
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A1174.PDF ] | |
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