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A1146EUA-T Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A1146EUA-T Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 12 page Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches A1145 and A1146 8 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Application Information For additional general application information, visit the Allegro Web site at www. allegromicro.com. GND A114x VCC V+ 0.01 μF A B B GND ECU Package UA Only A B Maximum separation 5 mm R SENSE CBYP Figure 3. Typical application circuit Typical Application Circuit The A114x family of devices must be protected by an external bypass capacitor, CBYP, connected between the supply, VCC, and the ground, GND, of the device. CBYP reduces both external noise and the noise generated by the chopper-stabilization func- tion. As shown in figure 3, a 0.01 μF capacitor is typical. Installation of CBYP must ensure that the traces that connect it to the A114x pins are no greater than 5 mm in length. All high-frequency interferences conducted along the supply lines are passed directly to the load through CBYP, and it serves only to protect the A114x internal circuitry. As a result, the load ECU (electronic control unit) must have sufficient protection, other than CBYP, installed in parallel with the A114x. A series resistor on the supply side, RS (not shown), in combina- tion with CBYP, creates a filter for EMI pulses. When determining the minimum VCC requirement of the A114x device, the voltage drops across RS and the ECU sense resistor, RSENSE, must be taken into consideration. The typical value for RSENSE is approximately 100 Ω. |
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