Datasheet AH3975Q, AH3976Q, AH3977Q, AH3978Q (Diodes)

AH3975Q/AH3976Q/AH3977Q/AH3978Q AUTOMOTIVE DUAL HALL EFFECT LATCH WITH SPEED & DIRECTION OUTPUTS INTEGRATED SELF-DIAGNOSTICS Description Pin Assignments
The AH3975Q/AH3976Q/AH3977Q/AH3978Q is an AEC-Q100 qualified high voltage dual Hall-effect sensor designed for the (Top View) applications that require accurate speed and direction sensing. To support wide range of demanding applications, the design has been optimized to operate over the supply range of 2.7V to 27V. With
V
DD
1 5 DIR/Q1
chopper stabilized architecture and an internal bandgap regulator to provide temperature compensated supply for internal circuits, the AH3975Q/AH3976Q/AH3977Q provides speed and direction outputs,
GND 2
while AH3978Q provides two independent outputs at Q1 and Q2.
GND 3 4 SP/Q2
For robustness and protection, the device has a reverse blocking diode with a Zener clamp on the supply. The built-in thermal protection also shuts down the chip if temperature rises to an abnormal value, and it will automatically restart the chip once the junction temperature drops TSOT25 (Type A1) below the safe value. The device is integrated with self-diagnostics which monitor internal blocks, and it will enter safe mode when error is detected. In the occasion of a supply voltage drop to minimum threshold point, undervoltage lockout protection would be triggered to freeze the
Applications
device, which prevents the electrical malfunction from affecting the next Power closures with anti-pinch features magnetic measurement circuits, and the output current state updated Rotation speed & direction detection is always based on the proper accurate measurement result. Linear speed & direction detection Angular position detection
Features and Performance
Knob controls Dual Latch Hall Operation with Dual Outputs (AH3978Q) or Speed & Direction Output (AH3975Q/AH3976Q/AH3977Q) Wide Supply Voltage Operation: 2.7V to 27V Chopper Stabilized Design Provides  Superior Temperature Stability  Minimal Switch Point Drift  Enhanced Immunity to Stress Battery Polarity Reverse Connection Protection Transient Spike Voltage Protection Overtemperature Shutdown and Auto-Restart UVLO Protection High ESD Rating: HBM = 5kV, CDM = 2kV AEC-Q100 Grade 0 Qualified

Ready for ISO 26262

Built-in Self-Diagnostics for Functional Safety Requirements

Temperature Range: -40°C to +150°C
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) The AH3975Q/AH3976Q/AH3977Q/AH3978Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. https://www.diodes.com/quality/product-definitions/
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. AH3975Q/AH3976Q/AH3977Q/AH3978Q 1 of 18 April 2023 Document number: DS43743 Rev. 1 - 2
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