ATS673-DS, Rev. 3
Description
Recognizing the increasingly stringent requirements for EMC/
EMI in automotive applications, Allegro has taken the necessary
steps to design devices that are capable of withstanding the
effects of radiated and conducted transients. The ATS673
and ATS674 devices have been designed specifically for this
purpose. Advanced circuitry on the die allows them to survive
positive and negative transient pulses on both the input and
output.
The ATS673 and ATS674 devices retain all of the same
characteristics as the ATS671 and ATS672. The devices remain
true zero-speed gear tooth sensor ICs with optimized Hall IC/rae
earth pellet configuration in an SIP (single in-line package). The
SIP assembly consists of a molded package that holds together
a samarium cobalt pellet, a pole piece, and a true zero-speed
Hall IC that has been optimized to the magnetic circuit.
These devices incorporate a single element Hall IC that switches
in response to magnetic signals created by a ferromagnetic
target. The IC contains a sophisticated digital circuit designed
to eliminate the detrimental effects of magnet and system
offsets. Signal processing is used to provide zero-speed
Features and Benefits
? Tight timing accuracy over operating temperature range
? True zero-speed operation
? TPOS (True Power-On State)
? Air-gap-independent switchpoints
? High immunity to vibration
? Large operating air gaps
? Operation with supply voltages down to 3.3 V
? Digital output representing target profile
? Single-chip solution for high reliability
? Optimized Hall IC/magnetic system
Self-Calibrating TPOS Gear Tooth Sensor ICs Optimized for
Automotive Cam Sensing Applications
Continued on the next page&
Functional Block Diagram
Not to scale
Packages: 4 pin SIP (suffix SE)
ATS673 and ATS674
Continued on the next page&
GND
VOUT
VCC
Output
Driver
0.1 糉
C
BYPASS
V+
Voltage
Regulator
(Analog)
TEST
Hall
Amp
Automatic
Gain
Control
V
PROC
9-Bit
PDAC
9-Bit
NDAC
Threshold
Comparator
(Recommended)
Voltage
Regulator
(Digital)
Offset Adjust
Temperature
Coefficient
Adjust
Offset TC
LPF
TPOS
TPOS Trim
Power-On
Reset
V
REF
Continuous
Update Logic
Continuous
Update Logic
Comp_P
Comp_N
Output State
Output State
9-Bit
Counter
Clock
9
9-Bit
Counter
Clock
9
Threshold
Output
V
REG(A)
V
REG(D)
V
REG(D)
V
REG(A)
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