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A1365LKTTN-5-T Datasheet(PDF) 20 Page - Allegro MicroSystems

Part No. A1365LKTTN-5-T
Description  Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1365LKTTN-5-T Datasheet(HTML) 20 Page - Allegro MicroSystems

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Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
A1365
20
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Power-On Reset (POR) and Undervoltage
Lockout (UVLO) Operation
The descriptions in this section assume: TA = 25°C, no output
load (RL, CL), and no significant magnetic field is present.
Power-Up At power-up, as VCC ramps up, the output is in a
high-impedance state. When VCC crosses VPORH (location
[1] in Figure 11 and [1'] in Figure 12), the POR Release
counter starts counting for tPORR. At this point, if VCC exceeds
VUVLOH [2'], the output will go to VCC / 2 after tUVLOD [3']. If
VCC does not exceed VUVLOH [2], the output will stay in the
high-impedance state until VCC reaches VUVLOH [3] and then
go to VCC / 2 after tUVLOD [4].
VCC drops below VCC(min)= 4.5 V If VCC drops below
VUVLOL [4', 5], the UVLO Enable Counter starts counting. If
VCC is still below VUVLOL when the counter reaches tUVLOE,
the UVLO function will be enabled and the ouput will be
pulled near GND [6]. If VCC exceeds VUVLOL before the
UVLO Enable Counter reaches 64 µs [5'], the output will
continue to be VCC/2.
Coming out of UVLO While UVLO is enabled [6], if VCC
exceeds VUVLOH [7], UVLO will be disabled after tUVLOD ,
and the output will be VCC / 2 [8].
Power-Down As VCC ramps down below VUVLOL [6’, 9], the
< t
UVLOE
t
UVLOE
t
PORR
t
PORR
t
UVLOD
t
UVLOD
t
UVLOD
t
UVLOE
1
1’
2’
4’ 5’
6’ 7’
3’
2
5.0
V
UVLOH
V
PORH
V
PORL
V
UVLOL
2.5
High Impedance
High Impedance
High Impedance
High Impedance
Slope =
V/ 2
CC
Slope =
V/ 2
CC
GND
Time
Time
Time
Time
GND
V
CC
V
CC
V
OUT
5.0
2.5
GND
GND
V
OUT
3
5
6
7
11
8
10
9
4
Slope =
V/ 2
CC
< 64 µs
V
UVLOH
V
PORH
V
PORL
V
UVLOL
Figure 11: POR and UVLO Operation – Slow Rise Time Case
Figure 12: POR and UVLO Operation – Fast Rise Time Case


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