ATS344
High-Precision Linear Hall-Effect Sensor IC with Two-Wire
Current-Mode PWM Output and an Integrated Rare-Earth Pellet Package
FEATURES AND BENEFITS
• Magnetic sensor IC with integrated rare-earth pellet
• Two-wire current mode PWM (pulse-width modulation)
output
• Customer-programmable position range selection and
offset, bandwidth, output clamps, and temperature
compensation
•
Sensitivity temperature coeff icient and offset drift preset
at Allegro
• Temperature-stable, mechanical stress immune, and
low noise device output via proprietary active stress
compensation and four-phase chopper stabilization
design techniques
• Wide ambient temperature range: –40°C to 150°C
• Operates with 3.75 to 9.5 V supply voltage
• Differential linear signal processing
• AEC-Q100 qualified
DESCRIPTION
The ATS344 device is a high-precision, back-biased
programmable Hall-effect linear sensor integrated circuit (IC)
with a conf igurable current-mode pulse-width-modulated output,
for both automotive and non-automotive applications. Integrated
within the ATS344 are two Hall-effect sensing elements, signal
processing circuitry, and a rare-earth magnetic pellet. The
magnetic pellet provides a common-mode magnetic bias while
the outputs of the two sensing elements are subtracted, amplified,
and processed to produce an output proportional to the differential
magnetic input signal. The differential magnetic input signal is
typically produced from influence of a ferromagnetic target.
The ATS344 is well-suited for applications that require axial
position sensing of a rotating target.
The signal path of the ATS344 provides flexibility through
external programming that allows the generation of an accurate,
and customized output response from a ferromagnetic target
perturbation. The ATS344 provides up to 10 bits of resolution.
This part is calibrated at the factory to ensure the most stable
response over specified conditions.
The BiCMOS monolithic integrated circuit incorporates two
Hall sensor elements and precision temperature-compensating
circuitry to reduce the intrinsic sensitivity and offset drift or
mismatch of the differential Hall elements. The amplif ication
and analog-to-digital conversion path is designed to ensure
optimal channel matching through the use of proprietary
dynamic offset cancellation circuits, and advanced active stress
compensation to reduce lifetime drift.
Continued on next page...
PACKAGE:
3-pin SIP (suff ix SP)
Not to scale
Analog Subsystem
...001 1001 1...
Digital Signal Processing
Output Stage
Magnetic
Signal
12-bit
Bandwidth
and
Temperature
Compensation
Sensitivity
and
Fine Offset
Adjustment
Output
Polarity
ICC
Hall
Elements
Analog
Amplification
Stage
A to D
Conversion
Clamps
PWM Current
Modulation
Figure 1: ATS344 Signal Processing Path.
Functions with programmable parameters indicated by double-headed arrows.
ATS344S-DS, Rev. 1
MCO-0000355
August 8, 2018
ATS344
High-Precision Linear Hall-Effect Sensor IC with Two-Wire
Current-Mode PWM Output and an Integrated Rare-Earth Pellet Package
With on-board EEPROM and advanced signal processing
functions, the ATS344 provides an unmatched level of customer
reprogrammable options for characteristics such as gain and offset,
bandwidth, and output clamps. In addition, the device supports
separate hot and cold temperature compensation.
The ATS344 in the 3-pin SIP package (SP suffix)
complies with the requirements of EU Directive
RoHS
2002/95/EC (RoHS) and 2011/65/EU (RoHS II),
amended by 2015/863/EU, on the Restriction of the
use of certain Hazardous Substances in electrical and electronic
equipment. The package contains an integrated SmCo rare-earth
pellet.
COMPLIANT
DESCRIPTION
(continued)
Table of Contents
Features and Benefits
........................................................... 1
Description
.......................................................................... 1
Package
............................................................................. 1
Selection Guide
................................................................... 2
Absolute Maximum Ratings
................................................... 2
Thermal Characteristics
........................................................ 2
Functional Block Diagram
..................................................... 3
Pinout Diagram and Terminal List
........................................... 3
Electrical Characteristics
....................................................... 4
Magnetic Characteristics
....................................................... 5
Programmable Characteristics
............................................... 6
Reference Target Characteristics
........................................... 8
Functional Description
........................................................ 10
Digital Signal Processing
................................................. 10
Protection Features
......................................................... 12
Typical Application
.......................................................... 13
Programmable Serial Interface
............................................. 14
Transaction Types
........................................................... 14
Writing the Access Code
.................................................. 14
Reading from EEPROM
................................................... 15
Error Checking
............................................................... 15
Timing Diagrams
................................................................ 16
Serial Write to Volatile Memory
......................................... 16
Serial Write to EEPROM
.................................................. 17
Serial Read from EEPROM
.............................................. 18
Serial Access Timeout
..................................................... 19
Serial Interface Message Structure
....................................... 21
Output Protocol
.................................................................. 24
PWM Output
.................................................................. 24
EEPROM Structure
............................................................ 25
EEPROM Customer-Programmable Parameter Reference
... 26
Definitions of Terms
............................................................ 33
Package Outline Drawing
.................................................... 35
SELECTION GUIDE
Part Number
ATS344LSPTN-T
[1]
Package
3-pin SIP
Packing
[1]
13-inch reel
Leadframe Plating
100% matte tin
Contact Allegro
™
for additional packing options
ABSOLUTE MAXIMUM RATINGS
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Forward Supply Current
Reverse Supply Current
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
I
CC
I
RCC
T
A
T
J
(max)
T
stg
L temperature range
Notes
Rating
20
–20
30
–30
–40 to 150
165
–65 to 165
Unit
V
V
mA
mA
°C
°C
°C
THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information
Characteristic
Package Thermal Resistance
[2]
Additional
Symbol
R
θJA
Test Conditions
[2]
Single-sided PCB, copper limited to solder pads, 2 pins (center pin removed)
Single-sided PCB, copper limited to solder pads, 3 pins
Value
159
146
Units
°C/W
°C/W
information is available on the Allegro website.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
ATS344
High-Precision Linear Hall-Effect Sensor IC with Two-Wire
Current-Mode PWM Output and an Integrated Rare-Earth Pellet Package
FUNCTIONAL BLOCK DIAGRAM
ATS344
VCC
UV/OV
Detection
POR
Analog
Regulator
Clock
Generator
Analog
Front End
Digital
Subsystem
12
Digital
Regulator
Serial
Decode
EEPROM
HV Pulse
Charge
Pump
Communications
Serial
Interface
Bandwidth
Select
C
BYPASS
10 nF
Anti-Alias
Filter
Hall
Elements
Temperature
Sensor
Precision
Reference
Master
Control
ADC
EEPROM
Control
Scan/
IDDQ
ADC
A/D
12
Temperature
Compensation
Digital
Sensitivity
and Offset Trim
Output
Polarity
Clamp
PW M
Driver
GND
PINOUT DIAGRAM AND TERMINAL LIST TABLE
1 2 3
Pinout Diagram
Terminal List Table
Number
1
2
3
Name
VCC
Test
GND
Function
Input power supply and current mode PWM output
Pin used for production testing at Allegro
Device ground
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
ATS344
High-Precision Linear Hall-Effect Sensor IC with Two-Wire
Current-Mode PWM Output and an Integrated Rare-Earth Pellet Package
ELECTRICAL CHARACTERISTICS:
Valid through full operating temperature range, T
A
, and supply voltage, V
CC
,
C
BYPASS
= 10 nF, unless otherwise specif ied
Characteristics
Supply Voltage
[1]
Supply Current
Reverse Supply Current
Slew Rate
[2]
Supply Zener Clamp Voltage
Hall Chopping Frequency
Undervoltage Detection
[3]
Overvoltage Detection
[3]
Output PWM Frequency
Integrated Capacitor
PWM Resolution
Power-On Time
[4][5]
Signal Path Propagation Delay
[4][5]
Full Scale Output Range
[1]
Supply
[2]
Determined
Symbol
V
CC
I
CC(LOW)
I
CC(HIGH)
I
CC(HYS)
I
RCC
SL
V
ZSUPPLY
f
C
V
CC(UV)LOW
V
CC(UV)HIGH
V
CC(OV)LOW
V
CC(OV)HIGH
f
PWM
C
BYPASS
Res
PWM
t
PO
t
SDLY
FSO
Test Conditions
Min.
3.75
6
13.6
5.2
Typ.
–
–
–
–
–
16
–
128
–
–
–
–
1000
10
12
3
3
–
Max.
9.5
10
16
6.5
–
–
–
–
–
3.7
–
13
1150
–
–
–
–
96
Unit
V
mA
mA
mA
mA
mA/µs
V
kHz
V
V
V
V
Hz
nF
bits
ms
ms
%DC
GENERAL ELECTRICAL CHARACTERISTICS
V
RCC
= –20 V, T
A
= 25°C
Refer to the application circuit in Figure 7
I
CC
= I
CC
(max) + 3 mA, T
A
= 25°C
T
A
= 25°C
–8
7
20
–
3.4
–
10.5
–
EEPROM FPWM_DC code 3
850
–
–
OUTPUT ELECTRICAL CHARACTERISTICS
BW setting = 500 Hz (EEPROM F3DB_DC = 4)
BW setting = 500 Hz (EEPROM F3DB_DC = 4)
–
–
–
Voltage is the potential measured between the VCC and GND pins.
from design and lab characterization on a limited number of samples; not tested in production.
[3]
Refer to section on Protection Features for more information on Undervoltage and Overvoltage Detection.
[4]
Determined from design and lab characterization on a limited number of samples; not tested in production.
[5]
See Def initions of Terms section.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
4
ATS344
High-Precision Linear Hall-Effect Sensor IC with Two-Wire
Current-Mode PWM Output and an Integrated Rare-Earth Pellet Package
MAGNETIC CHARACTERISTICS:
Valid at T
A
= 25°C and V
CC
= 5 V, unless otherwise specif ied
Characteristics
Symbol
Test Conditions
Reference Target at maximum air gap with
F3DB_DC setting = 500 Hz
Differential magnetic input signal
SENSDC = 0x0
[2]
Infinite air gap
Min.
Typ.
Max.
Unit
[1]
INITIAL DEVICE VALUES
(Before Customer Programming)
Effective Resolution
Input Signal Range
Initial Sensitivity
Initial Quiescent Output
Initial Output Clamp
Initial Sensitivity Drift Through
Temperature Range
[3]
Initial Offset Output Drift Through
Temperature Range
[3]
[1]
FSO
[2]
This
Res
eff
B
SIG
Sens
init
QOUT
init
OUTCLP(H)
init
OUTCLP(L)
init
D
Sens
init
DOUT(Q)
init
–
–340
–
–
97.7
1.7
9
–
0.404
50
98
2
0
±6
–
340
–
–
98.3
2.3
+4
–
bits
G
%FSO/G
%FSO
%DC
%DC
%
G
T
A
= –40°C to 150°C
T
A
= –40°C to 150°C
–4
–
means Full Scale Output. See Def initions of Terms section.
corresponds to a sensitivity multiplier of “4” according to the table “SENSDC - values” on page 32.
[3]
Initial Offset and Sensitivity drifts through temperature range may vary with influences from the application Target.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
5
模拟与混合信号
