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A1186 Datasheet(PDF) 8 Page - Allegro MicroSystems |
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A1186 Datasheet(HTML) 8 Page - Allegro MicroSystems |
8 / 14 page Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1185 and A1186 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 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 and Programming Circuit The A118x family of devices MUST be protected by an exter- nal bypass capacitor, CBYP, connected between the supply pin, VCC, and the ground pin, GND, of the device. CBYP reduces both external noise and the noise generated by the chopper-sta- bilization function. As shown in figure 3, a 0.01 μF capacitor is typical. (For programming the device, a 0.1 μF capacitor is recommended for proper fuse blowing.) Installation of CBYP must ensure that the traces that connect it to the A118x pins are no greater than 5 mm in length. (For programming the device, the capacitor may be further away from the device, including mounting on the board used for program- ming the device.) CBYP serves only to protect the A118x internal circuitry. All high-frequency interferences conducted along the supply lines are passed directly to the load through CBYP. As a result, the load ECU (electronic control unit) must have sufficient protec- tion, other than CBYP, installed in parallel with the A118x. 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 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. (All programming, including code and lock-bit programming, should be done with direct connections to VCC and GND, with the use of a 0.1uF bypass capacitor. Programming across the series resistor or sense resis- tor may not allow enough energy to properly blow the fuses in the device, as required for proper programming. The result would be incorrect switchpoints. |
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