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ATS672LSB-LN Datasheet(PDF) 11 Page - Allegro MicroSystems |
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ATS672LSB-LN Datasheet(HTML) 11 Page - Allegro MicroSystems |
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11 / 17 page  115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ATS660LSB TRUE ZERO-SPEED, HALL-EFFECT ADAPTIVE GEAR-TOOTH SENSOR 10 APPLICATIONS INFORMATION — Continued Operation from unregulated supply Operation from regulated supply Operation from a regulated power supply. These devices require minimal protection circuitry during operation from a low-voltage regulated line. The on-chip voltage regulator provides immunity to power supply variations between 4.5V and 26.5V. However, even while operating from a regulated line, some supply and output filtering is required to provide immunity to coupled and injected noise on the supply line. A basic RC low- pass circuit (R1C1) on the supply line and an optional output capacitor (C2) is recommended for operation in noisy environments. Because the device has an open-collector output, an output pull-up resistor (RL) must be included either at the sensor output (pin 2) or by the signal processor input. Operation from an unregulated power supply. In automotive applications, where the device receives its power from an unregulated supply such as the battery, full protection is generally required so that the device can withstand the many supply-side transients. Specifications for such transients vary between car manufacturers, and protection-circuit design should be optimized for each application. In the circuit shown, a standard protection circuit is constructed using discrete components. The Zener diode is used to provide over-voltage protection against load dumps greater than about 40 V; for load dumps less than about 40 V, the internal Zener is sufficient. The series resistor (R 1 ) provides current limiting and with the capaci- tor (C 1 ) noise filtering. The Zener diode and current- limiting resistor should be sized for power dissipation requirements. The series diode protects the external Zener diode against reverse battery and provides protection against transients greater than -24 V; it must be rated to withstand the most negative transient. In many transmis- sion applications there is already a Zener diode in the TCU, and the diode and external Zener are not necessary. 3 X X + - 12 4 Vcc Dwg. EH-008-6 RL 100 pF C 2 OUTPUT SUPPLY C1 R 1 3 X X Dwg. EH-008-7 + - 12 4 Vcc 20 Ω R L 0.1 µF 100 pF C2 OUTPUT SUPPLY C 1 R 1 |
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