A1356
High Precision Linear Hall-Effect Sensor
With an Open Drain Pulse Width Modulated Output
Features and Benefits
▪
Simultaneous programming of PWM carrier frequency,
quiescent duty cycle, and sensitivity; for system
optimization
▪
Factory programmed sensitivity temperature coefficient
and quiescent duty cycle drift
▪
Programmability at end-of-line
▪
Pulse width modulated (PWM) output provides increased
noise immunity compared to an analog output
▪
Precise recoverability after temperature cycling
• Output duty cycle clamps provide short circuit diagnostic
capabilities
▪
Optional 50% duty cycle calibration test mode at device
power up
▪
Wide ambient temperature range: –40°C to 150°C
▪
Resistant to mechanical stress
▪
Advanced chopper stabilization circuits and differential
signal path design lead to very low output offset levels
▪
Proprietary on-chip filters provide high output resolution
▪
Wide power supply operating range: 4.5 to 18 V
Description
The A1356 device is a high precision, programmable open
drain Hall-effect linear sensor IC with a pulse width modulated
(PWM) output. The duty cycle (D) of the PWM output signal
is proportional to an applied magnetic field. The A1356 device
converts an analog signal from its internal Hall element to
a digitally encoded PWM output signal. The coupled noise
immunity of the digitally encoded PWM output is far superior
to the noise immunity of an analog output signal.
The BiCMOS, monolithic circuit inside of the A1356 integrates
a Hall element, precision temperature-compensating circuitry
to reduce the intrinsic sensitivity and offset drift of the Hall
element, a small-signal high-gain amplifier, proprietary
dynamic offset cancellation circuits, and PWM conversion
circuitry. The dynamic offset cancellation circuits reduce
the residual offset voltage of the Hall element. Hall element
offset is normally caused by device overmolding, temperature
dependencies, and thermal stress. The high frequency offset
cancellation (chopping) clock allows for a greater sampling
rate, which increases the accuracy of the output signal and
results in faster signal processing capability.
The A1356 sensor is provided in a lead (Pb) free 3-pin single
inline package (KB suffix), with 100% matte tin leadframe
plaiting.
Package: 3-pin SIP (suffix KB)
Not to scale
Functional Block Diagram
PWM Carrier
Generation
VCC/
Programming
Regulator
1
2
2
1
PWM
Frequency Trim
Chopper
Switches
Amp
Signal
Recovery
Signal
Conditioning
PWMOUT
Sensitivity
Trim
Temperature
Compensation
% Duty
Cycle
% Duty Cycle
Temperature
Coefficient
GND
A1356-DS
A1356
High Precision Linear Hall-Effect Sensor
With an Open Drain Pulse Width Modulated Output
Selection Guide
Part Number
Packing*
A1356LKB-T
500 pieces per bag
A1356LKBTN-T
4000 pieces per 13-in. reel
*Contact Allegro
®
for additional packing options
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Output Voltage
Reverse Output Voltage
Output Current
Reverse Output Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
V
OUT
V
ROUT
I
OUTSINK
I
OUT
T
A
T
J
(max)
T
stg
V
CC
= 0 V
Internal current limiting is intended to protect
the device from output short circuits, but is not
intended for continuous operation
V
OUT
> –0.5 V, T
A
= 25°C
L temperature range
Notes
Rating
28
–18
24
–0.5
25
–50
–40 to 150
165
–65 to 170
Unit
V
V
V
V
mA
mA
ºC
ºC
ºC
Pin-out Diagram
Terminal List Table
Number
1
2
3
Name
VCC
GND
PWMOUT
Function
Input power supply; use bypass capacitor to connect to ground; also
used for programming
Ground
Open drain pulse width modulated output signal
1
2
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A1356
High Precision Linear Hall-Effect Sensor
With an Open Drain Pulse Width Modulated Output
OPERATING CHARACTERISTICS
Valid over full operating temperature range, T
A
, V
CC
= 4.5 to 18 V, C
BYPASS
= 0.1
μF,
unless
otherwise noted
Characteristics
Electrical Characteristics
Supply Voltage
Supply Current
Supply Zener Clamp Voltage
Power On Time
1,2,3
Internal Bandwidth
Chopping Frequency
4
Output Characteristics
PWMOUT Saturation Voltage
PWMOUT Current Limit
PWMOUT Leakage Current
PWMOUT Zener Clamp Voltage
PWMOUT Rise Time
2,3
PWMOUT Fall Time
2,3
Maximum Propagation Delay
2,3
Response Time
2,3
Load Resistance (External)
3
Load Capacitance (External)
3
Duty Cycle Jitter
2,3,5
Clamp Duty Cycle
3
Pre-Programming Target
6
Pre-Programming Quiescent Duty Cycle
Output
Pre-Programming Sensitivity
Pre-Programming PWM Output Carrier
Frequency
Quiescent Duty Cycle Programming
Initial Quiescent Duty Cycle Output
Guaranteed Quiescent Duty Cycle
Output Range
7
Quiescent Duty Cycle Output
Programming Bits
Average Quiescent Duty Cycle Output
Step Size
8,9
Quiescent Duty Cycle Output
Programming Resolution
10
Step
D(Q)
Err
PGD(Q)
T
A
= 25°C
T
A
= 25°C
D
(Q)init
D
(Q)
T
A
= 25°C
T
A
= 25°C
–
40
–
0.085
–
D(Q)
PRE
–
9
0.100
Step
D(Q)
× ±0. 5
–
60
–
0.115
–
%D
%D
bit
%D
%D
D
(Q)PRE
Sens
PRE
f
PWMPRE
B = 0 G, T
A
= 25°C
T
A
= 25°C
T
A
= 25°C
–
–
–
52
20
2.8
–
–
–
%D
(m% D)/G
kHz
V
SAT
I
LIMIT
I
LEAK
V
ZOUT
t
r
t
f
t
pd(max)
t
RESPONSE
R
L
C
L
J
D
D
CLP(HIGH)
D
CLP(LOW)
Symbol
V
CC
I
CC
V
Zsupply
t
PO
BW
i
f
C
Test Conditions
Min.
4.5
–
Typ.
–
6
–
–
400
200
–
–
60
0.1
–
3
3
1.5
–
–
–
–
–
–
Max.
18
10
–
4
–
–
0.6
0.5
80
10
–
–
–
–
2
–
10
±0.090
95
10
Unit
V
mA
V
ms
Hz
kHz
V
V
mA
μA
V
μs
μs
ms
ms
Ω
nF
%D
%D
%D
I
CC
= 18 mA, T
A
= 25ºC, t < 5 min
f
pwm
= 2 kHz
Small signal –3 dB, 100 G
(P-P)
magnetic input
signal
T
A
= 25°C
I
OUTSINK
≤
20 mA, PWMOUT transistor on
I
OUTSINK
≤
10 mA, PWMOUT transistor on
R
L
= 0
Ω
VCC = 3.2 V, 0 V
≤
PWMOUT
≤
24 V, PWMOUT
transistor off
I
OUTSINK
= I
LIMIT
, T
A
= 25ºC
R = 2 kΩ, C = 20 pF
R= 2 kΩ, C = 20 pF
Impulse magnetic field of 300 G, f
pwm
= 2 kHz
PWMOUT to VCC
PWMOUT to GND
Measured over 1000 output PWM clock periods,
3 sigma values, Sens = 60 m% / G
28
–
–
–
–
–
30
–
28
–
–
–
–
2040
–
–
90
5
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A1356
High Precision Linear Hall-Effect Sensor
With an Open Drain Pulse Width Modulated Output
OPERATING CHARACTERISTICS
(continued)
Valid over full operating temperature range, T
A
, V
CC
= 4.5 to 18 V,
C
BYPASS
= 0.1
μF,
unless otherwise noted
Characteristics
Sensitivity Programming
Initial Sensitivity
Guaranteed Sensitivity Range
Sensitivity Programming Bits
Average Sensitivity Step Size
8,9
Sensitivity Programming Resolution
10
Carrier Frequency Programming
Initial Carrier Frequency
Carrier Frequency Programming Range
Carrier Frequency Programming Bits
Average Carrier Frequency Step Size
8,9
Carrier Frequency Programming
Resolution
10
Calibration Test Mode
Calibration Test Mode Duration
3
Output Duty Cycle During Calibration
Mode
3
Lock Bit Programming
Overall Programming Lock Bit
Sensitivity Temperature Coefficient
11
Sensitivity Drift Through Temperature
Range
12
Sensitivity Drift Due to Package
Hysteresis
2
Factory Programmed Duty Cycle Drift
Duty Cycle Temperature Coefficient
11
Quiescent Duty Cycle Drift Through
Temperature Range
D
TC
ΔD
(Q)
T
A
= 150°C
Sens = Sens
PRE
, T
A
= 150°C
–
–
0
< ±0.35
–
–
(% D)/°C
%D
LOCK
Sens
TC
ΔSens
TC
T
A
= 150°C
T
A
= 150°C
–
–
–
–
1
0.03
< ±3
< ±1
–
–
–
–
bit
%/°C
%
%
t
CAL
D
CAL
f
PWM
= 2 kHz
T
A
= 25°C
45
49
50
50
55
51
ms
%D
Step
fPWM
Err
PGfPWM
T
A
= 25°C
T
A
= 25°C
f
PWMinit
f
PWM
T
A
= 25°C
T
A
= 25°C
–
1.8
–
90
–
f
PWMPRE
2
4
114
Step
fPWM
Step
SENS(low)
T
A
= 25°C
Symbol
Sens
init
Sens
LOW
T
A
= 25°C
T
A
= 25°C
Test Conditions
Min.
–
45
–
150
–
Typ.
Sens
PRE
–
8
300
Step
SENS
Max.
–
75
–
450
–
Unit
(% D)/G
(m% D)/G
bit
(μ% D)/G
(μ% D)/G
Err
PGSENS
T
A
= 25°C
× ±0. 5
–
2.2
–
140
–
Hz
kHz
bit
Hz
Hz
× ±0. 5
Factory Programmed Sensitivity Temperature Coefficient And Drift Characteristics
ΔSens
PKG
T
A
= 150°C, after temperature cycling
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A1356
High Precision Linear Hall-Effect Sensor
With an Open Drain Pulse Width Modulated Output
OPERATING CHARACTERISTICS
(continued)
Valid over full operating temperature range, T
A
, V
CC
= 4.5 to 18 V,
C
BYPASS
= 0.1
μF,
unless otherwise noted
Characteristics
Error Components
Linearity Sensitivity Error
2,3
Symmetry Sensitivity Error
2,3
1
After
2
See
Symbol
Lin
ERR
Sym
ERR
Test Conditions
Min.
–
–
Typ.
–
–
Max.
±3.0
±1.5
Unit
%
%
powering on the device, output of device needs time to reach valid magnetic response with a valid PWM output.
Characteristic Definitions section.
3
Guarenteed by design only. Characterized but not tested in production.
4
f varies up to approximately ± 20% over the full operating ambient temperature range, T , and process.
C
A
5
Jitter is dependent on the sensitivity of the device.
6
Raw device characteristic values before any programming.
7
D (max) is the value available with all programming fuses blown (maximum programming code set). The D
(Q)
(Q)
range is the total range from D
(Q)
(min)
up to and including D
(Q)
(max). See Characteristic Definitions section.
8
Step size is larger than required, in order to provide for manufacturing spread. See Characteristic Definitions section.
9
Non-ideal behavior in the programming DAC can cause the step size at each significant bit rollover code to be greater than twice the maximum
specified value of Step
D(Q)
, Step
SENS
, or Step
fPWM
.
10
Overall programming value accuracy. See Characteristic Definitions section.
11
Programmed at 150°C and calculated relative to 25°C.
12
Sensitivity drift from expected value at T after programming SENS . See Characteristic Definitions section.
A
TC
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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