Data Sheet 27633b 3235 2 3 4 GROUND 1 OUTPUT2 V CC Each device includes a Hall voltage generator, two Schmitt triggers, a voltage regulator, output transistors, and on-board reverse polarity protection. The regulator enables these devices to operate from voltages ranging between 4.5 V and 24 V. On-chip compensation circuitry stabilizes the switch points over temperature. OUTPUT1 Type UGN3235K Hall-effect sensor ICs are bipolar integrated circuits designed for commutation of brushless dc motors, and other rotary encoding applications using multi-pole ring magnets. The device features two outputs which are independently activated by magnetic fields of opposite polarity. SUPPLY X DUAL-OUTPUT HALL-EFFECT SWITCH T C U D O R y l P On Each open-collector output is independently operated by the proper amount and polarity of incident magnetic flux. Output 1 responds only to the positive flux from the south pole of a magnet, Output 2 to the negative flux from the north pole of a magnet. When the IC experiences the field of a south magnetic pole greater than the maximum operate point of Output 1, that output switches to the LOW state and Output 2 is unaffected. When the incident flux falls below the minimum release point for Output 1, that output returns to the HIGH state and Output 2 remains unchanged. D e E c U n e N er I T f e N R O r C o F S I D Dwg. PH-007 Pinning is shown viewed from branded side. Output 2 independently responds in the same manner to the negative flux from the north magnetic pole of a magnet. Figure 1 shows a zone in the region of 0 G, tH, where both outputs are in the HIGH or OFF state. This constitutes a delay that is independent of rate of change of the incident magnetic field and ensures that both outputs are never ON simultaneously. This is an essential feature for driving brushless dc motors with a minimum of reactive transient currents. The UGN3235K is supplied in a four-pin plastic single in-line package (SIP). ABSOLUTE MAXIMUM RATINGS at TA = +25°C Power Supply, VCC . . . . . . . . . . . . . . . . 25 V Reverse Battery Voltage, VRCC . . . . . -30 V Magnetic Flux Density, B . . . . . . Unlimited Output OFF Voltage, VOUT . . . . . . . . . . 25 V Output ON Current, IOUT . . . . . . . . . . 50 mA Operating Temperature Range, TA . . . . . . . . . . . . . . . . -20°C to + 85°C Storage Temperature Range TS . . . . . . . . . . . . . . . . -65°C to +150°C FEATURES ■ Reliable and Rugged Magnetic Sensing Switch ■ Two Outputs Independently Switched by North and South Poles ■ Independent Actuation of Outputs Minimizes Inductive-Load Reactive Transient ■ Built-in Hysteresis Minimizes Interference from Stray Fields ■ Operates from 4.5 V to 24 V ■ Outputs Compatible with All Logic Levels ■ On-Board Reverse Polarity Protection ■ Open-Collector, Active-Low Outputs Always order by complete part number: UGN3235K . 3235 DUAL-OUTPUT HALL-EFFECT SWITCH FUNCTIONAL BLOCK DIAGRAM 1 VCC 2 OUTPUT 1 3 OUTPUT 2 4 GROUND REG. X Dwg. FH-003A ELECTRICAL CHARACTERISTICS at TA = +25°C (unless otherwise noted). Characteristic Symbol Supply Voltage VCC Output Saturation Voltage Test Conditions Min. Typ. Max. Units 4.5 — 24 V VOUT(SAT) VCC = 24 V, IOUT = 20 mA — 160 400 mV Output Leakage Current IOFF VOUT = 24 V, VCC = 24 V — — 1.0 µA Supply Current ICC VCC = 24 V, Output Open — 6.0 8.0 mA Output Rise Time tr VCC = 14 V, RL = 820 Ω, CL = 20 pF — 0.04 0.4 µs Output Fall Time tf VCC = 14 V, RL = 820 Ω, CL = 20 pF — 0.18 0.4 µs MAGNETIC CHARACTERISTICS at VCC = 4.5 V to 24 V Characteristic Operate Point, BOP Release Point, BRP Hysteresis, Bhys Test Conditions Output Min. Max. Units TA = +25°C Q1 Q2 50 -175 175 -50 G G TA = -20°C to +85°C Q1 Q2 35 -200 200 -35 G G TA = +25°C Q1 Q2 25 -160 160 -25 G G TA = -20°C to +85°C Q1 Q2 15 -190 190 -15 G G TA = +25°C Q1 & Q2 15 100 G TA = -20°C to +85°C Q1 & Q2 15 110 G 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1989, 2003 Allegro MicroSystems, Inc. 3235 DUAL-OUTPUT HALL-EFFECT SWITCH SWITCH POINTS vs. TEMPERATURE TRANSFER CHARACTERISTICS 150 BOPS V OUT(OFF) 25 V MAX BRPS 50 0 BRPN -50 B OP1 B OP2 OUTPUT VOLTAGE SWITCH POINT IN GAUSS 100 BOPN -100 BRP1 BRP2 VOUT(SAT) 0 -150 -50 -25 0 50 25 75 100 125 AMBIENT TEMPERATURE IN °C 150 0 -B +B MAGNETIC FLUX Dwg. GH-027-1 Dwg. GH-043A APPLICATIONS +B (SOUTH) B OP1 MAGNETIC FLUX Figure 1 illustrates a method of sensing the presence of either a north or south magnetic pole. Because the UGN3235K is an open-collector device, it is possible to directly connect (wired OR) the two outputs. This causes the output to go LOW when either a north pole or south pole of sufficient magnitude is sensed. The device connected in this manner suits many applications, ranging from doubling the resolution of a ring-magnet encoder, to zero-crossing detection. B RP2 OUTPUTS Q1 20 mA 1 B OP2 ON DEAD TIME OFF DEAD TIME ON Q2 OFF ON OFF 2 VCC 0 –B (NORTH) VCC 4.5 V to 24 V X BRP1 4 3 Dwg. WH-009-1 SIGNAL OUTPUT Figure 2 Zero-crossing detection Dwg. EH-010 Figure 1 Omnipolar detector Figure 2 shows that there is a “dead time” approximately centered around 0 G. Thus, by sensing the HIGH portion of the UGN3235K wired-OR output, the zerocrossing can be detected. Figure 3 shows that the UGN3235K makes it possible to implement a very efficient brushless dc motor control using a minimum number of components. Referring again to Figure 1, the dead time (where both drivers are OFF) allows the motor coil field to decay sufficiently. This avoids both excessive reactive voltages and the magnetic drag resulting from the motor coils working in opposition to each other. 3235 DUAL-OUTPUT HALL-EFFECT SWITCH VCC 5 V to 24 V 2N4356 1 kΩ 1 kΩ 4 3 2N4356 2 X 1 VCC 0.1 µF Dwg. EH-009 Figure 3 Motor driver GUIDE TO INSTALLATION ELEMENT LOCATION ACTIVE AREA DEPTH 0.0165" 0.42 mm NOM 0.106" 2.70 mm 0.058" 1.47 mm A BRANDED SURFACE TEMPERATURE IN °C 280 260 240 220 200 1 2 3 4 Dwg. MH-001-1C 0 5 10 TIME IN SECONDS 15 20 Dwg. GA-001 All Hall-effect integrated circuits are susceptible to mechanical stress effects. Caution should be exercised to minimize the application of stress to the leads or the epoxy package. Use of epoxy glue is recommended. Other types may deform the epoxy package. To prevent permanent damage to the Hall cell, heat-sink the leads during hand soldering. Recommended maximum conditions for wave soldering are shown in the graph above. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3235 DUAL-OUTPUT HALL-EFFECT SWITCH Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) 5.28 5.16 0.208 0.203 0.063 0.059 45° 1.60 1.50 45° 3.51 3.38 0.138 0.133 45° 45° 0.085 1 2 3 0.033 4 2.16 1 2 3 0.84 4 MAX MAX 0.0173 0.0138 0.600 0.560 0.44 0.35 15.24 14.23 SEE NOTE SEE NOTE 0.0189 0.0142 0.48 0.36 0.050 BSC 1.27 BSC Dwg. MH-009D mm Dwg. MH-009D in Surface-Mount Lead Form (Suffix -TL) 2.41 0.095 ±0.13 ±0.005 0.004 MAX 0.002 0.051 MAX MAX 0°–8° 0.10 0.020 MIN FLAT MAX Dwg. MH-015 in 0°–8° 0.51 MIN FLAT Dwg. MH-015 mm NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor’s option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035” (0.89 mm). 5. Where no tolerance is specified, dimension is nominal. 6. Supplied in bulk pack (500 pieces per bag). 3235 DUAL-OUTPUT HALL-EFFECT SWITCH The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. 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 products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. 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 that may result from its use. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000