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A1193LLHLT-T2 Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1193LLHLT-T2 Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 18 page Programmable, Chopper-Stabilized, Two Wire Hall-Effect Switches A1190, A1192, and A1193 11 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Try Mode In Try mode, bit field addressing is accomplished by applying a series of VPM pulses to the VCC pin of the device, as shown in figure 6. Each pulse increases the bit field value for the selected parameter, increasing by one on the falling edge of each additional VPM pulse. When addressing the bit field in Try mode, the quantity of VPM pulses is represented by a decimal number called the code. Addressing activates the corresponding fuse locations in the given bit field by increasing the binary value of an internal DAC, up to the maximum possible code. As the value of the bit field code increases, the value of the programmable parameter changes. Measurements can be taken after each VPM pulse to determine if the required result for the programmable parameter has been reached. Cycling the supply voltage resets all the locations in the bit field that have un-blown fuses to their initial states. When setting the BOP Trim parameter, as an aid to programming, values can be traversed from low to high, or from high to low. To accommodate this direction selection, the value of the bit field (and code) defaults to the value 1, on the falling edge of the final register selection VPH pulse (see figure 5). A complete example is provided in figure 11. Blow Mode After the required code is determined for a given parameter, its value can be set permanently by blowing individual fuses in the appropriate register bit field. Blowing is accom- plished by selecting the register, then the Blow mode selection key, followed by the appropriate bit field address, and ending the sequence with the Blow pulse. The Blow mode selection key is a sequence of nine VPM pulses followed by one VPH pulse. A complete example is provided in figure 12. The Blow pulse consists of a VPH pulse of sufficient duration, tBLOW, to permanently set an addressed bit by blowing a fuse internal to the device. Due to power requirements, the fuse for each bit in the bit field must be blown individually. The A119x family built-in circuitry allows only one fuse at a time to be blown. During Blow mode, the bit field can be considered a “one- hot” shift register. Table 3 relates the quantity of VPM pulses to the binary and decimal values for Blow mode bit field address- ing. It should be noted that the simple relationship between the quantity of VPM pulses and the corresponding code is: 2n = Code, where n is the quantity of VPM pulses. The bit field has an initial state of decimal code 0 (binary 000000). Figure 6. Try mode bit field addressing pulses Figure 7. Example of code 5 broken into its binary components 0 VPH VPM VPL Table 3. Blow Mode Bit Field Addressing Quantity of VPM Pulses Binary Register Setting Equivalent Code 1 000001 1 2 000010 2 3 000100 4 4 001000 8 5 010000 16 6 100000 32 (Decimal Equivalent) Code 5 Bit Field Selection Address Code Format Code in Binary Fuse Blowing Target Bits Fuse Blowing Address Code Format (Binary) 1 0 1 Bit 2 Bit 0 Code 4 Code 1 (Decimal Equivalents) 0 Key VPH VPM VPL Figure 5. Register selection pulse sequence |
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