A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: October 31, 2011 Recommended Substitutions: • for the A1180LUA-T use the A1190LUA-T • for the A1180ELHLT-T use the A1190LLHLX-T • for the A1182EUA-T and the A1182LUA-T use the A1192LUA-T • for the A1182ELHLT-T and the A1182LLHLT-T use the A1192LLHLX-T • for the A1183EUA-T and the A1183LUA-T use the A1193LUA-T • for the A1183ELHLT-T and the A1183LLHLT-T use the A1193LLHLX-T NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches Features and Benefits Description ▪ Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress ▪ Field programmable for optimized switchpoints ▪ On-chip protection ▫ Supply transient protection ▫ Reverse-battery protection ▫ On-board voltage regulator ▫ 3.5 to 24 V operation The A1180, A1181, A1182, and A1183 devices are sensitive, two-wire, unipolar, Hall effect switches. The operate point, BOP, can be field-programmed, after final packaging of the device and placement into the application. This advanced feature allows the optimization of the device switching performance, by effectively accounting for variations caused by mounting tolerances for the device and the target magnet. This family of devices are produced on the Allegro MicroSystems advanced BiCMOS wafer fabrication process, which implements a patented, high-frequency, chopperstabilization technique that achieves magnetic stability and eliminates the offsets that are inherent in single-element devices exposed to harsh application environments. Commonly found in a number of automotive applications, the A1180-83 family of devices are utilized in sensing: seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches are particularly advantageous in price-sensitive applications, because they require one less Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA) Continued on the next page… Not to scale Functional Block Diagram V+ VCC Program/Lock Programming Logic Offset Regulator Clock/Logic Amp Sample and Hold Dynamic Offset Cancellation 0.01 uF Low-Pass Filter GND Package UA Only A1180-DS, Rev. 14 GND Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1180, A1181, A1182, and A1183 Description (continued) wire than the more traditional open-collector output switches. Additionally, the system designer gains inherent diagnostics because output current normally flows in either of two narrowlyspecified ranges. Any output current level outside of these two ranges is a fault condition. The A1180-83 family of devices also features on-chip transient protection, and a Zener clamp to protect against overvoltage conditions on the supply line. The output currents of the A1181 and A1183 switch HIGH in the presence of a south polarity magnetic field of sufficient strength; and switch LOW otherwise, including when there is no significant magnetic field present. The A1180 and A1182 have inverted out- put current levels: switching LOW in the presence of a south polarity magnetic field of sufficient strength, and HIGH otherwise. The devices also differ in their specified LOW current supply levels. Both devices are offered in two package styles: LH, a SOT-23W miniature low-profile package for surface-mount applications, and UA, a three-lead ultramini Single Inline Package (SIP) for through-hole mounting. Each package is available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated leadframe. Factory-programmed versions are also available. Refer to: A1140, A1141, A1142, A1143, A1145, and A1146. Selection Guide Packing1 Part Number A1180ELHLT-T3 7-in. reel, 3000 pieces/reel Surface mount Bulk, 500 pieces/bag SIP through hole A1180LUA-T4 A1182ELHLT-T4 7-in. reel, 3000 pieces/reel Surface mount Bulk, 500 pieces/bag SIP through hole 7-in. reel, 3000 pieces/reel Surface mount Bulk, 500 pieces/bag SIP through hole 7-in. reel, 3000 pieces/reel Surface mount A1182EUA-T4 A1182LLHLT-T4 A1182LUA-T4 A1183ELHLT-T4 A1183EUA-T4 A1183LLHLT-T4 Mounting Bulk, 500 pieces/bag SIP through hole 7-in. reel, 3000 pieces/reel Surface mount Bulk, 500 pieces/bag SIP through hole A1183LUA-T4 Ambient, TA (°C) Output South (+) Field2 Supply Current at Low Output, ICC(L) (mA) –40 to 85 Low 2 to 5 –40 to 85 Low –40 to 150 5 to 6.9 –40 to 85 High –40 to 150 1Contact Allegro for additional packing options. 2South (+) magnetic fields must be of sufficient strength. 3This variant is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device will enter its final, Last Time Buy, order phase. Status change: January 31, 2011. Suggested replacement: A1190LLHLX-T. 4Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: January 31, 2011. Absolute Maximum Ratings Characteristic Symbol Supply Voltage VCC Reverse Supply Voltage Notes Rating Units 28 V VRCC –18 V Magnetic Flux Density B Unlimited G Operating Ambient Temperature TA Maximum Junction Temperature Storage Temperature Range E –40 to 85 ºC Range L –40 to 150 ºC TJ(max) 165 ºC Tstg –65 to 170 ºC Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 2 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches ELECTRICAL CHARACTERISTICS over the operating voltage and temperature range, unless otherwise specified Characteristic Symbol Supply Voltage1 VCC Min. Typ. Max. Units 3.5 – 24 V B >BOP for A1180; B <BRP for A1181 2 – 5 mA B >BOP for A1182; B <BRP for A1183 5 – 6.9 mA B >BOP for A1181, A1183 B <BRP for A1180, A1182 12 – 17 mA Device powered on ICC(L) Supply Current2 Test Conditions ICC(H) Supply Zener Clamp Voltage VZ(supply) ICC = ICC(L)(max) + 3 mA; TA = 25°C 28 – 40 V Supply Zener Clamp Current IZ(supply) VZ(supply) = 28 V – – ICC(L)(max) + 3 mA mA IRCC VRCC = –18 V – – –1.6 mA di/dt No bypass capacitor; capacitance of the oscilloscope performing the measurement = 20 pF – 36 – mA/μs – 200 – kHz After factory trimming; with and without bypass capacitor (CBYP = 0.01 μF) – – 25 μs ton ≤ ton(max); VCC slew rate ≥ 25 mV/μs – HIGH – – Reverse Supply Current Output Slew Rate3 Chopping Frequency fC Power-On Time4 ton Power-On State5,6 POS 1V CC represents the generated voltage between the VCC pin and the GND pin. 2Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present). 3Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change. 4Measured with and without bypass capacitor of 0.01 μF. Adding a larger bypass capacitor causes longer Power-On Time. 5POS is defined as true only with a V CC slew rate of 25 mV / μs or greater. Operation with a VCC slew rate less than 25 mV / μs can permanently harm device performance. 6POS is undefined for t > t or B on RP < B < BOP . MAGNETIC CHARACTERISTICS1 over the operating voltage and temperature range, unless otherwise specified Characteristic Symbol Programmable Operate Point Range BOPrange Test Conditions Min. Typ. Max. Units ICC = ICC(H) for A1180 and A1182 ICC = ICC(L) for A1181 and A1183 60 – 200 G Initial Operate Point Range BOPinit VCC = 12 V – 33 60 G Switchpoint Step Size2 BRES VCC = 5 V, TA = 25°C 4 8 12 G Switchpoint setting – 5 – Bit Programming locking – 1 – Bit – – ±20 G 5 15 30 G Number of Programming Bits – Temperature Drift of BOP ∆BOP Hysteresis BHYS BHYS = BOP – BRP 1Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present). 2The range of values specified for B RES is a maximum, derived from the cumulative programming bit errors. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 3 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Characteristic Data ICC(L) versus Ambient Temperature at Various Levels of VCC (A1180, A1181) ICC(L) versus Ambient Temperature at Various Levels of VCC (A1182, A1183) 10 10 8 VCC (V) 6 ICC(L) (mA) ICC(L) (mA) 8 3.5 12 4 24 2 VCC (V) 6 3.5 12 4 24 2 0 0 -50 0 50 100 150 200 -50 0 Ambient Temperature, TA (°C) 50 100 150 200 Ambient Temperature, TA (°C) ICC(H) versus Ambient Temperature at Various Levels of VCC (A1180, A1181, A1182, A1183) 20 ICC(H) (mA) 18 VCC (V) 16 3.5 12 14 24 12 10 -50 0 50 100 150 200 Ambient Temperature, TA (°C) Hysteresis versus Ambient Temperature at Various Levels of VCC (A1180, A1181, A1182, A1183) Average BOP Bits versus Ambient Temperature (A1180, A1181, A1182, A1183) 30 175 75 BOPinit Bit 1 Bit 2 Bit 3 Bit 4 50 Bit 5 150 125 100 25 BHYS (G) Average BOP (G) 200 VCC (V) 20 3.5 12 15 24 10 25 5 0 -50 0 50 100 150 Ambient Temperature, TA (°C) 200 -50 0 50 100 150 200 Ambient Temperature, TA (°C) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 4 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Device Qualification Program Contact Allegro for information. EMC (Electromagnetic Compatibility) Requirements Contact your local representative for EMC results. Test Name Reference Specification ESD – Human Body Model AEC-Q100-002 ESD – Machine Model AEC-Q100-003 Conducted Transients ISO 7637-2 Direct RF Injection ISO 11452-7 Bulk Current Injection ISO 11452-4 TEM Cell ISO 11452-3 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Symbol RθJA Package Thermal Resistance Test Conditions* Value Units Package LH, 1-layer PCB with copper limited to solder pads 228 ºC/W Package LH, 2-layer PCB with 0.463 in.2 of copper area each side connected by thermal vias 110 ºC/W Package UA, 1-layer PCB with copper limited to solder pads 165 ºC/W *Additional thermal information available on Allegro Web site. Maximum Allowable VCC (V) Power Derating Curve 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 VCC(max) 2-layer PCB, Package LH (RθJA = 110 ºC/W) 1-layer PCB, Package UA (RθJA = 165 ºC/W) 1-layer PCB, Package LH (RθJA = 228 ºC/W) 20 40 60 80 100 VCC(min) 120 140 160 180 Temperature (ºC) Power Dissipation, PD (m W) Power Dissipation versus Ambient Temperature 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 0 2l (R aye rP θJ C A = 11 B, P 0 º ac 1-la C/ ka W (R yer PC ) ge L θJA = B H 165 , Pac ºC/ kage W) UA 1-lay er P (R CB, θJA = 228 Packag ºC/W e LH ) 20 40 60 80 100 120 Temperature (°C) 140 160 180 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 6 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1180, A1181, A1182, and A1183 Functional Description Operation The output, ICC, of the A1180 and A1182 devices switch low after the magnetic field at the Hall element exceeds the operate point threshold, BOP. When the magnetic field is reduced to below the release point threshold, BRP, the device output goes high. The differences between the magnetic operate and release point is called the hysteresis of the device, BHYS. This built- I+ in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. The A1181 and A1183 devices switch with opposite polarity for similar BOP and BRP values, in comparison to the A1180 and A1183 (see figure 1). I+ Switch to High ICC ICC ICC(H) Switch to Low Switch to Low Switch to High ICC(H) ICC(L) BRP BHYS (A) A1180 and A1182 B+ B– BRP BOP B– ICC(L) 0 BOP 0 B+ BHYS (B) A1181 and A1183 Figure 1. Alternative switching behaviors are available in the A118x device family. On the horizontal axis, the B+ direction indicates increasing south polarity magnetic field strength, and the B– direction indicates decreasing south polarity field strength (including the case of increasing north polarity). Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 7 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Chopper Stabilization Technique A limiting factor for switchpoint accuracy when using Hall effect technology is the small signal voltage developed across the Hall element. This voltage is proportionally small relative to the offset that can be produced at the output of the Hall element device. This makes it difficult to process the signal and maintain an accurate, reliable output over the specified temperature and voltage range. Chopper stabilization is a unique approach used to minimize Hall offset on the chip. The Allegro patented technique, dynamic quadrature offset cancellation, removes key sources of the output drift induced by temperature and package stress. This offset reduction technique is based on a signal modulation-demodulation process. The undesired offset signal is separated from the magnetically induced signal in the frequency domain through modulation. The subsequent demodulation acts as a modulation process for the offset causing the magnetically induced signal to recover its original spectrum at base band while the DC offset becomes a high frequency signal. Then, using a low-pass filter, the signal passes while the modulated DC offset is suppressed. The chopper stabilization technique uses a 200 kHz high frequency clock. For demodulation process, a sample-and-hold technique is used, where the sampling is performed at twice the chopper frequency (400KHz). The sampling demodulation process produces higher accuracy and faster signal processing capability. Using this chopper stabilization approach, the chip is desensitized to the effects of temperature and stress. This technique produces devices that have an extremely stable quiescent Hall output voltage, is immune to thermal stress, and has precise recoverability after temperature cycling. This technique is made possible through the use of a BiCMOS process which allows the use of low-offset and low-noise amplifiers in combination with high-density logic integration and sample-and-hold circuits. The repeatability of switching with a magnetic field is slightly affected using a chopper technique. The Allegro high frequency chopping approach minimizes the affect of jitter and makes it imperceptible in most applications. Applications that may notice the degradation are those that require the precise sensing of alternating magnetic fields such as ring magnet speed sensing. For those applications, Allegro recommends the “low jitter” family of digital devices. Regulator Hall Element Amp Sample and Hold Clock/Logic Low-Pass Filter Figure 2. Chopper stabilization circuit (dynamic quadrature offset cancellation) Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 8 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Application Information For additional general application information, visit the Allegro MicroSystems Web site at www. allegromicro.com. Typical Application Circuit The A118x family of devices must be protected by an external bypass capacitor, CBYP, connected between the supply, VCC, and the ground, GND, of the device. CBYP reduces both external noise and the noise generated by the chopper-stabilization function. As shown in figure 3, a 0.01 μF capacitor is typical. V+ VCC A118x Installation of CBYP must ensure that the traces that connect it to the A118x pins are no greater than 5 mm in length. All high-frequency interferences conducted along the supply lines are passed directly to the load through CBYP, and it serves only to protect the A118x internal circuitry. As a result, the load ECU (electronic control unit) must have sufficient protection, other than CBYP, installed in parallel with the A118x. A series resistor on the supply side, RS (not shown), in combination with CBYP, creates a filter for EMI pulses. (Additional information on EMC is provided on the Allegro MicroSystems Web site.) When determining the minimum VCC requirement of the A118x device, the voltage drops across RS and the ECU sense resistor, RSENSE, must be taken into consideration. The typical value for RSENSE is approximately 100 Ω. B GND CBYP 0.01 uF GND B A A Package UA Only B Maximum separation 5 mm RSENSE ECU Figure 3. Typical application circuit Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 9 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Power Derating The device must be operated below the maximum junction temperature of the device, TJ(max). Under certain combinations of peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the application. This section presents a procedure for correlating factors affecting operating TJ. (Thermal data is also available on the Allegro MicroSystems Web site.) The Package Thermal Resistance, RJA, is a figure of merit summarizing the ability of the application and the device to dissipate heat from the junction (die), through all paths to the ambient air. Its primary component is the Effective Thermal Conductivity, K, of the printed circuit board, including adjacent devices and traces. Radiation from the die through the device case, RJC, is relatively small component of RJA. Ambient air temperature, TA, and air motion are significant external factors, damped by overmolding. The effect of varying power levels (Power Dissipation, PD), can be estimated. The following formulas represent the fundamental relationships used to estimate TJ, at PD. PD = VIN × IIN (1) T = PD × RJA (2) TJ = TA + ΔT Example: Reliability for VCC at TA = 150°C, package UA, using minimum-K PCB. Observe the worst-case ratings for the device, specifically: RJA = 165°C/W, TJ(max) = 165°C, VCC(max) = 24 V, and ICC(max) = 17 mA. Calculate the maximum allowable power level, PD(max). First, invert equation 3: Tmax = TJ(max) – TA = 165 °C – 150 °C = 15 °C This provides the allowable increase to TJ resulting from internal power dissipation. Then, invert equation 2: PD(max) = Tmax ÷ RJA = 15°C ÷ 165 °C/W = 91 mW Finally, invert equation 1 with respect to voltage: VCC(est) = PD(max) ÷ ICC(max) = 91 mW ÷ 17 mA = 5 V The result indicates that, at TA, the application and device can dissipate adequate amounts of heat at voltages ≤VCC(est). Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reliable operation between VCC(est) and VCC(max) requires enhanced RJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and VCC(max) is reliable under these conditions. (3) For example, given common conditions such as: TA= 25°C, VCC = 12 V, ICC = 4 mA, and RJA = 140 °C/W, then: PD = VCC × ICC = 12 V × 4 mA = 48 mW T = PD × RJA = 48 mW × 140 °C/W = 7°C TJ = TA + T = 25°C + 7°C = 32°C A worst-case estimate, PD(max), represents the maximum allowable power level (VCC(max), ICC(max)), without exceeding TJ(max), at a selected RJA and TA. Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 10 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches Programming Protocol V+ 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 coding. 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 31 increments. The actual change in magnetic flux (G) represented 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 31 increments are individually identified using 5 data bits, which are physically represented by 5 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 4. VPH VPM VPL Td(P) 0 Td(0) Td(1) t Figure 4. Pulse amplitudes and durations Additional information on device programming and programming products is available on www. allegromicro.com. Programming hardware is available for purchase, and programming software is available free of charge. 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 allowing 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 difference is that when provisionally setting bitfields, no fuse-blowing pulse is sent at the end of the pulse sequence. PROGRAMMING PROTOCOL CHARACTERISTICS, over operating temperature range, unless otherwise noted Characteristic Symbol Min. Typ. Max. Units 4.5 5.0 5.5 V VPM 11.5 12.5 13.5 V VPH 25.0 26.0 27.0 V VPL Programming Voltage1 Programming Current2 Pulse Width Test Conditions Minimum voltage range during programming IPP tr = 11 μs; 5 V → 26 V; CBYP = 0.1 μF - 190 - mA td(0) OFF time between programming bits 20 - - μs td(1) Pulse duration for enable and addressing sequences 20 - - μs td(P) Pulse duration for fuse blowing 100 300 - μs Pulse Rise Time tr VPL to VPM; VPL to VPH 5 - 20 μs Pulse Fall Time tf VPM to VPL; VPH to VPL 5 - 100 μs 1Programming voltages are measured at the VCC pin. 2A bypass capacitor with a minimum capacitance of 0.1 provide the current necessary to blow the fuse. μF must be connected from VCC to the GND pin of the A118x device in order to Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 11 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1180, A1181, A1182, and A1183 The pulse sequences consist of the following groups of pulses: 1. An enable sequence. 2. A bitfield address sequence. 3. When permanently setting the bitfield, a long VPH fuse-blowing pulse. (Note: Blown bit fuses cannot be reset.) 4. When permanently setting the bitfield, the level of VCC must be allowed to drop to zero between each pulse sequence, in order to clear all registers. However, when provisionally setting bitfields, VCC must be maintained at VPL between pulse sequences, in order to maintain the prior bitfield settings while preparing to set additional bitfields. Bitfields that are not set are evaluated as zeros. The bitfield-level fuses for 0 value bitfields are never blown. This prevents inad- vertently setting the bitfield to 1. Instead, blowing the devicelevel fuse protects the 0 bitfields from being accidentally set in the future. When provisionally trying the calibration value, one pulse sequence is used, using decimal values. The sequence for setting the value 510 is shown in figure 5. When permanently setting values, the bitfields must be set individually, and 510 must be programmed as binary 101. Bit 3 is set to 1 (0001002, which is 410), then bit 1 is set to 1 (0000012, which is 110). Bit 2 is ignored, and so remains 0.Two pulse sequences for permanently setting the calibration value 5 are shown in figure 6. The final VPH pulse is maintained for a longer period, enough to blow the corresponding bitfield-level fuse. V+ VPH VPM VPL 0 Enable Address Try 510 Optional Monitoring Clear t Figure 5. Pulse sequence to provisionally try calibration value 5. V+ VPH VPM VPL Address 0 Enable Address Encode 001002 (410) Blow Enable Blow Encode 000012 (110) Figure 6. Pulse sequence to permanently encode calibration value 5 (101 binary, or bitfield address 3 and bitfield address 1). t Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 12 A1180, A1181, A1182, and A1183 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches V+ Enabling Addressing Mode. The first segment of code is a keying sequence used to enable the bitfield addressing mode. As shown in figure 7, this segment consists of one short VPH pulse, one VPM pulse, and one short VPH pulse, with no supply interruptions. This sequence is designed to prevent the device from being programmed accidentally, such as by noise on the supply line. VPH VPM VPL 0 t Figure 7. Addressing mode enable pulse sequence V+ VPH Address 1 Address 2 Address n ( ≤ 31) Address Selection. After addressing mode is enabled, the VPM target bitfield address, is indicated by a series of VPM pulses, as shown in figure 8. VPL 0 t Figure 8. Pulse sequence to select addresses V+ Falling edge of final BOP address digit VPH Lock Bit Programming. After the desired BOP calibration value is programmed, and all of the corresponding bitfield-level fuses are blown, the device-level fuse should be blown. To do so, the lock bit (bitfield address 32) should be encoded as 1 and have its fuse blown. This is done in the same manner as permanently setting the other bitfields, as shown in figure 9. VPM VPL 32 pulses 0 Enable Address Blow Encode Lock Bit Figure 9. Pulse sequence to encode lock bit Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com t 13 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1180, A1181, A1182, and A1183 Package LH, 3-Pin (SOT-23W) +0.12 2.98 –0.08 1.49 D 4°±4° 3 A +0.020 0.180–0.053 0.96 D +0.10 2.90 –0.20 +0.19 1.91 –0.06 2.40 0.70 D 0.25 MIN 1.00 2 1 0.55 REF 0.25 BSC 0.95 Seating Plane Gauge Plane B PCB Layout Reference View Branded Face 8X 10° REF 1.00 ±0.13 NNT +0.10 0.05 –0.05 0.95 BSC 1 C 0.40 ±0.10 N = Last two digits of device part number T = Temperature code For Reference Only; not for tooling use (reference dwg. 802840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Active Area Depth, 0.28 mm REF B Reference land pattern layout All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances C Branding scale and appearance at supplier discretion D Hall element, not to scale Standard Branding Reference View Pin-out Drawings Package LH, 3-pin SOT Package UA, 3-pin SIP 3 1. VCC 2. No connection 3. GND 1. VCC 2. GND 3. GND NC 1 2 1 2 3 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 14 Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches A1180, A1181, A1182, and A1183 Package UA, 3-Pin SIP +0.08 4.09 –0.05 45° B C E 2.04 1.52 ±0.05 1.44 E Mold Ejector Pin Indent +0.08 3.02 –0.05 E Branded Face 45° 1 2.16 MAX D Standard Branding Reference View = Supplier emblem N = Last two digits of device part number T = Temperature code 0.79 REF A 0.51 REF NNT 1 2 3 +0.03 0.41 –0.06 15.75 ±0.51 For Reference Only; not for tooling use (reference DWG-9049) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown A Dambar removal protrusion (6X) B Gate burr area C Active Area Depth, 0.50 mm REF +0.05 0.43 –0.07 D Branding scale and appearance at supplier discretion E Hall element, not to scale 1.27 NOM Copyright ©2004-2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 15