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A1128LUA-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1128LUA-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
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9 / 20 page  Highly Programmable Hall-Effect Switch A1128 9 Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 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). The A1128 features three programmable modes, Try mode, Blow mode,andReadmode: • In Try mode, programmable parameter values are set and mea- sured simultaneously. 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. •InReadmode,eachbitmaybeverifiedasblownornotblown. 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. Note that, for all programming modes, no parameter programming registers are accessible after the device- level LOCK bit is set. The only function that remains accessible is the overall Fuse Checking feature. Although any programmable variable power supply can be used to generate the pulse waveforms, for design evaluations, 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. (Note: This kit is not recommended for production purposes.) 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 settings of a particular Programming Guidelines Table 1. Programming Pulse Requirements, Protocol at TA = 25°C Characteristics 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 VCC = 5 → 26 V, CBLOW = 0.1 µF (min); minimum supply current required to ensure proper fuse blowing. 175 – – mA Pulse Width tLOW Duration of 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 VPM to VPL or VPH to VPL 5 – 100 µs Blow Pulse Slew Rate SRBLOW 0.375 – – V/µs Figure 4. Programming pulse definitions (see table 1) GND (Supply cycled) Programming pulses Blow pulse tACTIVE tLOW tLOW tBLOW tPr tPf VPH VPM VPL |
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