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A1382LUA-T Datasheet(PDF) 11 Page - Allegro MicroSystems |
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A1382LUA-T Datasheet(HTML) 11 Page - Allegro MicroSystems |
11 / 18 page Programmable Linear Hall Effect Sensor ICs with Analog Output Available in a Miniature Thin Profile Surface Mount Package A1381, A1382, A1383, and A1384 11 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Programming Pulse Requirements, Protocol at TA = 25°C Characteristic Symbol Notes Min. Typ. Max. Units Programming Voltage VP(LOW) Measured at the VOUT pin. - - 5.5 V VP(MID) 14 15 16 V VP(HIGH) 26 27 28 V Programming Current IP Minimum supply current required to ensure proper fuse blowing. In addition, a min- imum capacitance, CBLOW = 0.1 μF, must be connected between the VOUT and GND pins during programming to provide the current necessary for fuse blowing. 300 - - mA Pulse Width tOFF(HIGH) Duration at VP(LOW) level following a VP(HIGH) level. 30 - - μs tOFF(MID) Duration at VP(LOW) level following a VP(MID) level. 5 - - μs tACTIVE(HIGH) Duration of VP(HIGH) level for VPH pulses during key/code selection. 30 - - μs tACTIVE(MID) Duration of VP(MID) level for VPH pulses during key/code selection. 15 - - μs tBLOW Duration at VP(HIGH) level for fuse blowing. 30 - - μs Pulse Rise Time tPr Rise time required for transitions from VP(LOW) to either VP(MID) or VP(HIGH). 1 - 100 μs Pulse Fall Time tPf Fall time required for transitions from VP(HIGH) to either VP(MID) to VP(LOW). 1 - 100 μs Overview Programming is accomplished by sending a series of input volt- age pulses serially through the VOUT pin of the device. A unique combination of different voltage level pulses controls the internal programming logic of the device to select a desired program- mable parameter and change its value. There are two program- ming pulses, referred to as a high voltage pulse, VPH, consisting of a VP(LOW) –VP(HIGH) –VP(LOW) sequence and a mid voltage pulse, VPM, consisting of a VP(LOW) –VP(MID) –VP(LOW) sequence. The 138x features Try mode, Blow mode, and Lock mode: In Try mode, the value of a single programmable parameter may • be set and measured. The parameter value is stored temporar- ily, and resets after cycling the supply voltage. Note that other parameters cannot be accessed simultaneously in this mode. In Blow mode, the value of a single programmable parameter • may be permanently set by blowing solid-state fuses internal to the device. Additional parameters may be blown sequentially. In Lock mode, a device-level fuse is blown, blocking the fur- • ther programming of all parameters. 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 waveforms, Allegro highly recom- mends using the Allegro Sensor IC Evaluation Kit, available on the Allegro Web site 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. Incrementing the bit field of a particular 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, with a value expressed as the decimal equivalent of the binary value. The LSB of a register is denoted as key 1, or bit 0. Code. The number used to identify the combination of fuses activated in a bit field, expressed as the decimal equivalent of the binary value. The LSB of a bit field is denoted as code 1, or bit 0. Addressing. Incrementing the bit field code of a selected register by serially applying a pulse train through the VOUT pin of the device. Each parameter can be measured during the addressing process, but the internal fuses must be blown before the program- ming code (and parameter value) becomes permanent. Fuse Blowing. Applying a VPH voltage pulse of sufficient dura- tion at the VP(HIGH) level to permanently set an addressed bit by blowing a fuse internal to the device. Once a bit (fuse) has been blown, it cannot be reset. Blow Pulse. A VPH voltage pulse of sufficient duration at the VP(HIGH) level to blow the addressed fuse. Cycling the Supply. Powering-down, and then powering-up the supply voltage. Cycling the supply is used to clear the program- ming settings in Try mode. Programming Guidelines |
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