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A3250EUA-T Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A3250EUA-T Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 15 page Field-Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switches A3250 and A3251 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com VPH V+ t VPM VPL 0 Td(1) Td(0) Td(P) Figure 1. Pulse amplitudes and durations PROGRAMMING PROTOCOL CHARACTERISTICS , TA = 25ºC, unless otherwise noted Characteristic Symbol Test Conditions Min. Typ. Max. Units Programming Voltage1 VPL Minimum voltage range during programming 4.5 5.0 5.5 V VPM 10 11 12 V VPH 23 25 26 V Programming Current2 IPP Maximum supply current during programming – 500 – mA Pulse Width td(0) OFF time between programming bits 20 – – μs td(1) Pulse duration (ON time) for enable, address, fuse blowing or lock bits 20 – – μs td(P) Pulse duration (ON time) for fuse blowing 100 300 – μs Pulse Rise Time tr VPL to VPM; VPL to VPH 11 – – μs Pulse Fall Time tf VPM to VPL; VPH to VPL 5–– μs 1 Programming voltages are measured at the VCC pin. 2 A bypass capacitor with a minimum capacitance of 0.1 μF must be connected from VCC to the GND pin of the device in order to provide the current necessary to blow the fuse. Additional information on device programming and program- ming products is available on www. allegromicro.com. Program- ming hardware is available for purchase, and programming software is available free of charge. Programming Protocol The operate switchpoint, BOP, can be field-programmed. To do so, a coded series of voltage pulses through the VCC pin is used to set bitfields in onboard registers. The effect on the device output can be monitored, and the registers can be cleared and set repeatedly until the required BOP is achieved. To make the setting permanent, bitfield-level solid state fuses are blown, and finally, a device-level fuse is blown, blocking any further cod- ing. It is not necessary to program the release switchpoint, BRP, because the difference between BOP and BRP, referred to as the hysteresis, BHYS, is fixed. The range of values between BOP(min) and BOP(max) is scaled to 64 increments. The actual change in magnetic flux (G) repre- sented by each increment is indicated by BRES (see the Operating Characteristics table; however, testing is the only method for verifying the resulting BOP). For programming, the 64 incre- ments are individually identified using 6 data bits, which are physically represented by 6 bitfields in the onboard registers. By setting these bitfields, the corresponding calibration value is programmed into the device. Three voltage levels are used in programming the device: a low voltage, VPL , a minimum required to sustain register settings; a mid-level voltage, VPM , used to increment the address counter in the device; and a high voltage, VPH , used to separate sets of VPM pulses (when short in duration) and to blow fuses (when long in duration). A fourth voltage level, essentially 0 V, is used to clear the registers between pulse sequences. The pulse values are shown in the Programming Protocol Characteristics table and in figure 1. Code Programming. Each bitfield must be individually set. To do so, a pulse sequence must be transmitted for each bitfield that is being set to 1. If more than one bitfield is being set to 1, all pulse sequences must be sent, one after the other, without allow- ing VCC to fall to zero (which clears the registers). The same pulse sequence is used to provisionally set bitfields as is used to permanently set bitfield-level fuses. The only differ- ence is that when provisionally setting bitfields, no fuse-blowing pulse is sent at the end of the pulse sequence. |
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