A1230: Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar
17Pages

A1230 Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch Features and Benefits ▪ Two matched Hall effect switches on a single substrate ▪ 1 mm Hall element spacing ▪ Superior temperature stability and industry-leading jitter performance through use of advanced chopperstabilization topology ▪ Integrated regulator provides 3.3 V operation ▪ Integrated ESD protection from outputs and VCC to ground ▪ High sensitivity switchpoints ▪ Robust structure for EMC protection ▪ Solid-state reliability ▪ Reverse battery protection on supply and both output pins The A1230 is a dual-channel, bipolar switch with two Halleffect sensing elements, each providing a separate digital output for speed and direction signal processing capability. The Hall elements are photolithographically aligned to better than 1 μm. Maintaining accurate mechanical location between the two active Hall elements eliminates the major manufacturing hurdle encountered in fine-pitch detection applications. The A1230 is a highly sensitive, temperature stable magnetic sensing device ideal for use in ring magnet based, speed and direction systems located in harsh automotive and industrial environments. Packages: 8-pin SOIC (suffix L), and 4-pin SIP (suffix K) The A1230 monolithic integrated circuit (IC) contains two independent Hall-effect bipolar switches located 1 mm apart. The digital outputs are out of phase so that the outputs are in quadrature when interfaced with the proper ring magnet design. This allows easy processing of speed and direction signals. Extremely low-drift amplifiers guarantee symmetry between the switches to maintain signal quadrature. The Allegro™ patented, high-frequency chopper-stabilization technique cancels offsets in each channel providing stable operation over the full specified temperature and voltage ranges. Additionally, the high-frequency chopping circuits allow an increased analog signal-to-noise ratio at the input of the digital Continued on the next page… Typical Application VOUTPUTB VOUTPUTA 2 OUTPUTA depending on Conducted Immunity requirements Using regulated supply

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch Description (continued) comparators internal to the IC. As a result, the A1230 achieves industry-leading digital output jitter performance that is critical in high performance motor commutation applications. An on-chip regulator allows the use of this device over a wide operating voltage range. Post-assembly factory programming at Allegro provides sensitive switchpoints that are symmetrical between the two switches. The A1230 is available in a plastic 8-pin SOIC surface mount package (L) and a plastic 4-pin SIP (K). Both are...

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch Functional Block Diagram Programmable Trim Low Noise Signal Recovery Dynamic Offset Cancellation LowPass Filter Output Drive Low Noise Signal Recovery Dynamic Offset Cancellation LowPass Filter Output Drive Pin-Out Diagrams Package K Terminal List Table OUTPUTA Output from E1 via rst Schmitt circuit OUTPUTB Output from E2 via second Schmitt circuit Connects power supply to on-chip voltage regulator Terminal for ground connection No connection Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts...

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch OPERATING CHARACTERISTICS Valid over operating temperature ranges unless otherwise noted; typical data applies to VCC = 12 V, and TA = 25ºC Characteristic Test Conditions ELECTRICAL CHARACTERISTICS Supply Voltage2 Either output Supply Current Output Leakage Current Both outputs; IOUTPUT(SINK) = 20 mA; B > BOP(A), B > BOP(B) Output Sink Current Output Sink Current, Continuous3 Output Sink Current, Chopping Frequency Output Rise Time Output Fall Time Power-On Time Power-Off Time Power-On State TRANSIENT PROTECTION...

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch OPERATING CHARACTERISTICS (continued) Valid over operating temperature ranges unless otherwise noted; typical data applies to VCC = 12 V, and TA = 25ºC Characteristic Test Conditions MAGNETIC CHARACTERISTICS6 Operate Point: B > BOP BOP(A), BOP(B) BRP(A), BRP(B) BHYS(A), BHYS(B) SYMA, SYMB Operate Symmetry: BOP(A) – BOP(B) Release Symmetry: BRP(A) – BRP(B) Hysteresis: BOP(A) – BRP(A), BOP(B) – BRP(B) Symmetry: Channel A, Channel B, BOP(A) + BRP(A), BOP(B) + BRP(B) G (gauss) = 0.1 mT (millitesla). operating at maximum voltage,...

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Test Conditions* Value Units Package K, 1-layer PCB with copper limited to solder pads Package L-8 pin, 1-layer PCB with copper limited to solder pads Package L-8 pin, 4-layer PCB based on JEDEC standard Package Thermal Resistance *Additional thermal data available on the Allegro Web site. VCC(max) Package L, 4-layer PCB (RθJA = 80 ºC/W) Package L, 1-layer PCB (RθJA = 140 ºC/W) Package K, 1-layer PCB (RθJA = 177...

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch Electrical Operating Characteristics ICC(OFF) Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch Magnetic Operating Characteristics Channel A, BOP and BRP Channels A and B, BHYS(A) and BHYS(B) Channels A and B, BHYS(A) and BHYS(B) Additional magnetic characteristics on next page Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch Magnetic Operating Characteristics Additional magnetic characteristics on next page Allegro MicroSystems, LLC 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com