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A1193 Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1193 Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 18 page Programming Guidelines Overview Programming is accomplished by sending a series of input volt- age pulses serially through the VCC (supply) pin of the device. A unique combination of different voltage level pulses controls the internal programming logic of the device to select a desired programmable parameter and change its value. There are three voltage levels that must be taken into account when program- ming. These levels are referred to as high (VPH), mid (VPM), and low (VPL) (see figure 1 and table 1). The A119x family features two programmable modes, Try mode and Blow mode. • In Try mode, programmable parameter values are set and mea- sured. A parameter value is stored temporarily, and reset after cycling the supply voltage. • In Blow mode, the value of a programmable parameter may be permanently set by blowing solid-state fuses internal to the device. Device locking is also accomplished in this mode. The programming sequence is designed to help prevent the device from being programmed accidentally; for example, as a result of noise on the supply line. Although any programmable variable power supply can be used to generate the pulse wave- forms, Allegro highly recommends using the Allegro Sensor IC Evaluation Kit, available on the Allegro website On-line Store. The manual for that kit is available for download free of charge, and provides additional information on programming these devices. Definition of Terms Register. The section of the programming logic that controls the choice of programmable modes and parameters. Bit Field. The internal fuses unique to each register, represented as a binary number. Changing the bit field selection in a particu- lar register causes its programmable parameter to change, based on the internal programming logic. Key. A series of VPM voltage pulses used to select a register or mode. Table 1. Programming Pulse Requirements, Protocol at TA = 25°C (refer also to figure 4) Characteristic Symbol Notes Min. Typ. Max. Unit Programming Voltage VPL Measured at the VCC pin. 4.5 5 5.5 V VPM 12.5 – 14 V VPH 21 – 27 V Programming Current IPP tPr = 11 μs, VCC = 5 → 26 V, CBLOW = 0.1 μF (min). Minimum supply current required to ensure proper fuse blowing. CBLOW must be connected between the VCC and GND pins during programming to provide the current necessary for fuse blowing. 175 – – mA Pulse Width tLOW Duration at VPL separating pulses at VPM or VPH.20 – – μs tACTIVE Duration of pulses at VPM or VPH for key/code selection. 20 – – μs tBLOW Duration of pulse at VPH for fuse blowing. 90 100 – μs Pulse Rise Time tPr VPL to VPM, or VPL to VPH. 5 – 100 μs Pulse Fall Time tPf VPH to VPL, or VPM to VPL. 5 – 100 μs Blow Pulse Slew Rate SRBLOW 375 – – mV/ μs 0 (Supply cycled) Programming pulses Blow pulse tACTIVE tLOW tLOW tBLOW tPr tPf VPH VPM VPL Figure 4. Programming pulse definition (see table 1) Programmable, Chopper-Stabilized, Two Wire Hall-Effect Switches A1190, A1192, and A1193 9 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com |
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