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SOT25.pngAutomotive Dual Hall Effect Latch with Speed & Direction Outputs Integrated Self-diagnostics
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The AH3975Q/AH3976Q/AH3977Q/AH3978Q is an AEC-Q100 qualified high voltage dual Hall-effect sensor designed for the 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 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, while AH3978Q provides two independent outputs at Q1 and 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 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 device, which prevents the electrical malfunction from affecting the next magnetic measurement circuits, and the output current state updated is always based on the proper accurate measurement result.
| Compliance(Only Automotive supports PPAP) | Automotive |
|---|---|
| AEC Qualified | Yes |
| Type | Latch |
| Outputs | Dual |
| Output Type | Open Drain |
| Active Output State (B > Bop) | Low |
| Inactive Output State (B < Brp) | High-Z |
| Key Feature | ISO 26262-Ready, Diagnostics |
| Operating Voltage (V) | 2.7 to 27 |
| Average Supply Current (mA) | 4.7 |
| Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) | 50 |
| Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) | 75 |
| Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss) | 100 |
| Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) | -100 |
| Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) | -75 |
| Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss) | -50 |
| Operating Ambient Temperature (°C) | -40 to 150 |
