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A1183LUA-T Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A1183LUA-T Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 16 page 10 A1180-DS, Rev. 2 Worcester, Massachusetts 01615-0036 (508) 853-5000 115 Northeast Cutoff, Box 15036 www.allegromicro.com Allegro MicroSystems, Inc. Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1180/81/82/83 Application Information For additional general application information, visit the Allegro MicroSystems Web site at www. allegromicro.com. GND A118x VCC V+ 0.01 uF A B B GND ECU Package UA Only A B Maximum separation 5 mm R SENSE C BYP Figure 3. Typical application circuit Typical Application Circuit The A118x 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 A118x 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 A118x internal circuitry. As a result, the load ECU (electronic control unit) must have sufficient protection, other than CBYP, installed in parallel with the A118x. A series resistor on the supply side, RS (not shown), in combi- nation with CBYP, creates a filter for EMI pulses. (Additional information on EMC is provided on the Allegro MicroSystems Web site.) When determining the minimum VCC requirement of the A118x 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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