OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

A1393SEHLX-T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Micro Power 3 V Linear Hall Effect Sensor ICs
with Tri-State Output and User Selectable Sleep Mode
A1391, A1392,
A1393, and A1395
10
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Device Low-Power Functionality
A139x are low-power Hall effect sensor ICs that are perfect for
power sensitive customer applications. The current consumption
of these devices is typically 3.2 mA, while the device is in the
active mode, and less than 25 μA when the device is in the sleep
mode. Toggling the logic level signal connected to the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin
drives the device into either the active mode or the sleep mode.
A logic low sleep signal drives the device into the sleep mode,
while a logic high sleep signal drives the device into the active
mode.
In the case in which the VREF pin is powered before the VCC
pin, the device will not operate within the specified limits until
the supply voltage is equal to the reference voltage. When the
device is switched from the sleep mode to the active mode, a time
defined by t
PON
must elapse before the output of the device is
valid. The device output transitions into the high impedance state
approximately t
POFF
seconds after a logic low signal is applied to
the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin (see figure 1).
If possible, it is recommended to power-up the device in the
sleep mode. However, if the application requires that the device
be powered on in the active mode, then a 10 kΩ resistor in series
with the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin is recommended. This resistor will limit the
current that flows into the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin if certain semiconductor
junctions become forward biased before the ramp up of the volt-
age on the VCC pin. Note that this current limiting resistor is not
required if the user connects the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin directly to the VCC
pin. The same precautions are advised if the device supply is
powered-off while power is still applied to the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin.
B field
V
CC
V
SLEEP
I
CC
V
OUT
t
PON
t
PON
+B
0
–B
t
POFF
t
POFF
HIGH
IMPEDANCE
HIGH
IMPEDANCE
HIGH
IMPEDANCE
Figure 1. A139x Timing Diagram
Micro Power 3 V Linear Hall Effect Sensor ICs
with Tri-State Output and User Selectable Sleep Mode
A1391, A1392,
A1393, and A1395
11
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Device Supply Ratiometry Application Circuit
Figures 2 and 3 present applications where the VCC pin is con-
nected together with the VREF pin of the A139x. Both of these
pins are connected to the battery, Vbat2. In this case, the device
output will be ratiometric with respect to the battery voltage.
The only difference between these two applications is that the
S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin in figure 2 is connected to the Vbat2 potential, so the
device is always in the active mode. In figure 3, the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin is
toggled by the microprocessor; therefore, the device is selectively
and periodically toggled between active mode and sleep mode.
In both figures, the device output is connected to the input of an
A-to-D converter. In this configuration, the converter reference
voltage is Vbat1.
It is strongly recommended that an external bypass capacitor be
connected, in close proximity to the A139x device, between the
VCC and GND pins of the device to reduce both external noise
and noise generated by the chopper-stabilization circuits inside of
the A139x.
Vbat1
C
bypass
VCC
OUT
GND GND
SLEEP
VREF
Vbat2
A139x
Micro-
processor
Supply pin
I/O
I/O
Figure 2. Application circuit showing sleep mode disabled and output ratiometirc to the
A139x supply.
Figure 3. Application circuit showing microprocessor-controlled sleep mode and output ratiome-
tirc to the A139x supply.
Vbat1
Vbat2
processor
Supply pin
I/O
I/O
C
bypass
VCC
OUT
GND GND
SLEEP
VREF
Micro-
A139x
Micro Power 3 V Linear Hall Effect Sensor ICs
with Tri-State Output and User Selectable Sleep Mode
A1391, A1392,
A1393, and A1395
12
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Application Circuit with User-Configurable Ratiometry
C
filter
C
bypass
Vbat2
Micro-
processor
Supply pin
I/O
I/O
Vbat
1
VCC
OUT
GND GND
SLEEP
VREF
A139x
Vbat2
Micro-
processor
Supply pin
I/O
I/O
Vbat1
C
filter
C
bypass
VCC
OUT
GND GND
SLEEP
VREF
A139x
Figure 4. Application circuit showing ratiometry of V
REF
. Sleep mode is disabled and the VREF
pin is tied to the microprocessor supply.
Figure 5. Application circuit showing device reference pin, VREF, tied to microprocessor supply. The device
sleep mode also is controlled by the microprocessor.
In figures 4 and 5, the microprocessor supply voltage determines
the ratiometric performance of the A139x output signal. As in the
circuits shown in figures 2 and 3, the device is powered by the
Vbat2 supply, but in this case, ratiometry is determined by the
microprocessor supply, Vbat1.
The S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin is triggered by the output logic signal from the
microprocessor in figure 5, while in figure 4, the S
¯
¯
L
¯
¯
E
¯
¯
E
¯
¯
P
¯
pin is
connected to the device power supply pin. Therefore, the device
as configured in figure 4 is constantly in active mode, while
the device as confiugred in figure 5 can be periodically toggled
between the active and sleep modes.
The capacitor C
filter
is optional, and can be used to prevent pos-
sible noise transients from the microprocessor supply reaching
the device reference pin, VREF.
It is strongly recommended that an external bypass capacitor be
connected, in close proximity to the A139x device, between the
VCC and GND pins of the device to reduce both external noise
and noise generated by the chopper-stabilization circuits inside of
the A139x.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

A1393SEHLX-T

Mfr. #:
Buy A1393SEHLX-T
Manufacturer:
Description:
SENSOR HALL ANALOG 6MLP/DFN
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet