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A1391 Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1391 Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 16 page Micro Power 3 V Linear Hall Effect Sensor ICs with Tri-State Output and User Selectable Sleep Mode A1391, A1392, A1393, and A1395 11 Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Device Supply Ratiometry Application Circuit Figures 2 and 3 present applications where the VCC pin is con- nected together with the VREF pin of the A139x. Both of these pins are connected to the battery, Vbat2. In this case, the device output will be ratiometric with respect to the battery voltage. The only difference between these two applications is that the S¯¯L¯¯E¯¯E¯¯P¯ pin in figure 2 is connected to the Vbat2 potential, so the device is always in the active mode. In figure 3, the S¯¯L¯¯E¯¯E¯¯P¯ pin is toggled by the microprocessor; therefore, the device is selectively and periodically toggled between active mode and sleep mode. In both figures, the device output is connected to the input of an A-to-D converter. In this configuration, the converter reference voltage is Vbat1. It is strongly recommended that an external bypass capacitor be connected, in close proximity to the A139x device, between the VCC and GND pins of the device to reduce both external noise and noise generated by the chopper-stabilization circuits inside of the A139x. Vbat1 Cbypass VCC OUT GND GND SLEEP VREF Vbat2 A139x Micro- processor Supply pin I/O I/O Figure 2. Application circuit showing sleep mode disabled and output ratiometirc to the A139x supply. Figure 3. Application circuit showing microprocessor-controlled sleep mode and output ratiome- tirc to the A139x supply. Vbat1 Vbat2 processor Supply pin I/O I/O Cbypass VCC OUT GND GND SLEEP VREF Micro- A139x |
Similar Part No. - A1391_16 |
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Similar Description - A1391_16 |
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