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ATS685LSHTN-T

P1-P3P4-P6P7-P9P10-P12P13-P15
Features and Benefits
• Fully optimized differential digital gear tooth sensor IC
• Running Mode Lockout
• Unique algorithms for increased vibration immunity
• AGC and reference adjust circuit
• Air gap independent switchpoints
• Digital output representing gear profile
• Precise duty cycle throughout operating temperature range
• Large operating air gap range
• Short power-on time
• True zero-speed operation
• Undervoltage lockout (UVLO)
• Wide operating voltage range
• Internal current regulator for two-wire operation
• Single-chip sensing IC for high reliability
• Robust test coverage capability using Scan Path
and IDDQ measurement
Description
The ATS685LSH is an optimized Hall-effect sensing integrated
circuit and rare-earth pellet combination that provides a
user-friendly solution for true zero-speed digital gear-tooth
sensing in two-wire applications. The sensor IC consists of a
single-shot molded plastic package that includes a samarium
cobalt pellet, a pole piece, and a Hall Effect IC that has been
optimized to the magnetic circuit. This small package can be
easily assembled and used in conjunction with a wide variety
of gear shapes and sizes.
The single integrated circuit incorporates a dual element
Hall-effect sensor IC and signal processing circuitry that
switches in response to differential magnetic signals created
by ferromagnetic targets. The device contains a sophisticated
compensating circuit to eliminate magnetic and system offsets.
Digital tracking of the analog signal is used to achieve true
zero speed operation. Advanced calibration algorithms are
used to adjust the device gain and offset at power-up, resulting
in air gap independent switchpoints, which greatly improves
output accuracy. In addition, advanced algorithms mitigate the
effect of system anomalies such as target vibration and sudden
changes in air gap.
The regulated current output is configured for two-wire
operation. This sensor IC is ideal for obtaining edge and duty
cycle information in gear-tooth–based applications such as
transmission speed.
The ATS685 is provided in a 4-pin SIP package that is lead
(Pb) free, with 100% matte tin leadframe plating.
ATS685LSH-DS
Two-Wire, Zero Speed
Differential Gear Tooth Sensor IC
Package: 4-pin SIP (suffix SH)
Functional Block Diagram
Not to scale
ATS685LSH
GND
VCC
TEST
Multiplexor
Voltage
Regulator
Hall
Amp
Offset
Adjust
Reference
Generator
and
Lockout
PDAC
AGC
Synchronous Digital Controller
NDAC
Two-Wire, Zero Speed
Differential Gear Tooth Sensor IC
ATS685LSH
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Pin-out Diagram
Terminal List Table
Number Name Function
1 VCC Supply voltage
2 NC No connection (float or tie to GND)
3 TEST Test (float or tie to GND)
4 GND Ground
Selection Guide
Part Number Packing*
ATS685LSHTN-T 13-in. reel, 800 pieces per reel
*Contact Allegro
™
for additional packing options
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage V
CC
26.5 V
Reverse Supply Voltage V
RCC
–18 V
Operating Ambient Temperature T
A
Range L, refer to Power Derating Curve –40 to 150 ºC
Maximum Junction Temperature T
J
(max) 165 ºC
Storage Temperature T
stg
–65 to 170 ºC
2431
Two-Wire, Zero Speed
Differential Gear Tooth Sensor IC
ATS685LSH
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS V
CC
and T
A
within specification, unless otherwise noted
Characteristics Symbol Test Conditions Min. Typ.
1
Max. Unit
2
Electrical Characteristics
Supply Voltage
3
V
CC
Operating, T
J
< T
J
(max), I
CC
within specification 4.0 – 24 V
Undervoltage Lockout V
CC(UV)
V
CC
0 → 5 V or 5 → 0 V – 3.5 3.95 V
Reverse Supply Current
4
I
RCC
V
CC
= –18 V – – –10 mA
Supply Zener Clamp Voltage V
Z
I
CC
= I
CC
(max) + 3 mA, T
A
= 25°C 28 – – V
Supply Zener Current I
Z
T
A
= 25°C, V
CC
= 28 V – – 19 mA
Supply Current
I
CC(Low)
Low-current state 4 6 8 mA
I
CC(High)
High-current state 12 14 16 mA
Supply Current Ratio
I
CC(High)
/
I
CC(Low)
Ratio of high current to low current 1.85 – 3.05 –
Test Pin Zener Clamp Voltage
5
V
ZTEST
–6–V
Power-On State Characteristics
Power-On Time
6
t
PO
V
CC
> V
CC
(min), f
OP
< 100 Hz – 1 2 ms
Power-On State
7
POS t > t
PO
–I
CC(High)
–A
Output Stage
Output Slew Rate
8,9
di / dt
Δi / Δt from 90% to 10% I
CC
level
R
SENSE
= 100 Ω, C
LOAD
= 10 pF, no C
BYPASS
7 14 – mA/μs
Performance Characteristics
Operating Frequency f
OP
0 – 12 kHz
Analog Signal Bandwidth BW 16 20 – kHz
Operate Point B
OP
% of peak-to-peak B
SIG
, AG
OP
within
specification
–70–%
Release Point B
RP
% of peak-to-peak B
SIG
, AG
OP
within
specification
–30–%
Running Mode Lockout Enable
Threshold
V
LOE(RM)
At peak-to-peak V
PROC
< V
LOE(RM)
,
output
switching disables
– 170 – mV
Running Mode Lockout Release
Threshold
V
LOR(RM)
At peak-to-peak V
PROC
> V
LOR(RM)
, output
switching enables
– 200 – mV
Calibration
Start Mode Hysteresis PO
HYS
–V
LOR(RM)
–mV
Initial Calibration
10
CAL
I
Rising output (current) edges, f
OP
< 200 Hz – – 3 edges
Continued on the next page…
P1-P3P4-P6P7-P9P10-P12P13-P15

ATS685LSHTN-T

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MAGNET SW SPEC PURP 4PIN MODULE
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