(3515 / 3516) Linear Hall-effect Sensors

3515 3516 AND RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION The A3515– and A3516– are sensitive, temperature-stable linear Halleffect sensors with greatly improved offset characteristics. Ratiometric, linear Hall-effect sensors provide a voltage output that is proportional to the applied magnetic field and have a quiescent output voltage that is approximately 50% of the supply voltage. These magnetic sensors are ideal for use in linear and rotary position sensing systems in the harsh environments of automotive and industrial applications over extended temperatures to -40°C and +150°C. The A3515– features an output sensitivity of 5 mV/G, while the A3516– has an output sensitivity of 2.5 mV/G. See the Magnetic Characteristics table for complete, individual device parametrics. Each BiCMOS monolithic circuit integrates a Hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the Hall element, a small-signal high-gain amplifier, and a rail-to-rail lowimpedance output stage. A proprietary dynamic offset cancelation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependancies, and thermal stress. www.DataSheet4U.com This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Many problems normally associated with low-level analog signals are minimized by having the Hall element and amplifier in a single chip. Output precision is obtained by internal gain and offset trim adjustments during the manufacturing process. These devices are supplied in a 3-pin ultra-mini-SIP ‘UA’ package. Data Sheet 27501.10B§ V CC 1 X 2 3 GROUND Dwg. PH-006 Pinning is shown viewed from branded side. OUTPUT SUPPLY ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC .............................. 8.0 V Output Voltage, VO ................................ 8.0 V Output Sink Current, IO ....................... 10 mA Magnetic Flux Density, B .............. Unlimited Package Power Dissipation, PD ........................................... See Graph Operating Temperature Range*, TA Suffix ‘E–’ ..................... -40°C to +85°C Suffix ‘L–’ .................... -40°C to +150°C Storage Temperature Range, TS .................................. -65°C to +170°C * Infrequent excursions permitted; see Applications Information. FEATURES s Temperature-Stable Quiescent Output Voltage s Precise Recoverability After Temperature Cycling s Output Voltage Proportional to Applied Magnetic Field s Ratiometric Rail-to-Rail Output s Improved Sensitivity s 4.5 V to 5.5 V Operation s Immune to Mechanical Stress s Small Package Size s Solid-State Reliability Always order by complete part number, e.g., A3515LUA . 3515 AND 3516 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS FUNCTIONAL BLOCK DIAGRAM 1 SUPPLY Vcc DYNAMIC OFFSET CANCELLATION LOW-PASS FILTER 800 ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS 700 Suffix "–UA" RθJA = 165°C/W 600 Suffix "–U" RθJA = 184°C/W 500 400 300 200 Suffix "E–" 100 Suffix "L–" 0 20 40 60 100 80 120 AMBIENT TEMPERATURE in °C 140 160 180 Dwg. GH-046A 2 + – X 3 OUTPUT – + 2 GROUND Vcc/2 Dwg. FH-016A 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1996, 2002 Allegro MicroSystems, Inc. 3515 AND 3516 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 5 V (unless otherwise noted). Limits Characteristic Supply Voltage Supply Current Quiescent Voltage Output Output Voltage Symbol VCC ICC VOQ VOH VOL Output Source Current Limit Bandwidth (-3 dB) Clock Frequency Output Resistance Wide-Band Output Noise (rms) IOLM BW fC rO eo IO ≤ -2 mA B = 0, BW = 10 Hz to 10 kHz, IO ≤ -1 mA, CO = 100 pF Test Conditions Operating B = 0, VCC = 6 V, IO = 0 B = 0, IO = 1 mA, TA = 25°C B = +X*, IO = 1 mA B = -X*, IO = -1 mA B = -X*, VO = 0 Min. 4.5 – 2.425 Typ. 5.0 7.2 2.500 Max. 5.5 10 2.575 Units V mA V – – -1.0 4.7 0.2 -1.5 – – – V V mA – – – – 30 170 1.0 400 – – – – kHz kHz Ω µV NOTE 1 – Typical data is at TA = 25°C and is for design information only. NOTE 2 – Negative current is defined as coming out of (sourcing) the output. * This test requires positive and negative fields sufficient to swing the output driver between fully OFF and saturated (ON), respectively. It is NOT intended to indicate a range of linear operation. www.allegromicro.com 3 3515 AND 3516 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS MAGNETIC CHARACTERISTICS over operating temperature range, at VCC = 5 V, IO = -1 mA (unless otherwise noted). Part Numbers A3515EUA Characteristic* Operating Temp. Range, TA Sensitivity at TA = 25°C ∆Sens(∆T) at TA = Max. ∆Sens(∆T) at TA = Min. ∆VOQ(∆T) † A3515LUA Min. Typ. Max. -40 – +150 A3516EUA Min. Typ. Max. -40 – +85 A3516LUA Min. Typ. Max. -40 – +150 Units °C mV/G % % G % % % % % Min. Typ. Max. -40 – +85 4.50 5.00 5.50 -2.5 2.5 7.5 1.0 ±10 – – – – – 4.50 5.00 5.50 -2.5 2.5 7.5 1.0 ±10 – – – – – 2.25 2.50 2.75 -2.5 2.5 7.5 1.0 ±10 – – – – – 2.25 2.50 2.75 -2.5 2.5 7.5 1.0 ±10 – – – – – -9.0 -1.3 – – – – – – – 100 100 100 100 100 -9.0 -1.3 – – – – – – – 100 100 100 100 100 -9.0 -1.3 – – – – – – – 100 100 100 100 100 -9.0 -1.3 – – – – – – – 100 100 100 100 100 Ratiometry, ∆VOQ(∆V) Ratiometry, ∆Sens(∆V) Positive Linearity, Lin+ Negative Linearity, Lin– Symmetry NOTE 1 – Magnetic flux density is measured at most sensitive area of device located 0.0195" (0.50 mm) below the branded face of the “UA” package. NOTE 2 – 10 G = 1 mT, exactly. NOTE 3 – Except for ∆Sens(∆T), typical data is at TA = 25°C and is for design information only. * See Characteristics Definitions for test conditions. † This calculation (formula 1, next page) yields the device’s equivalent accuracy, over the operating temperature range, in gauss. 4 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3515 AND 3516 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS CHARACTERISTICS DEFINITIONS Quiescent Voltage Output. In the quiescent state (no magnetic field), the output is ideally equal to one-half of the supply voltage over the operating voltage and temperature range (VOQ ∪ VCC/2). Due to internal component tolerances and thermal considerations, there is a tolerance on the quiescent voltage output and on the quiescent voltage output as a function of supply voltage and ambient temperature. For purposes of specification, the quiescent voltage output as a function of temperature is defined as ∆VOQ(∆T) = VOQ(TA) – VOQ(25°C) Sens(25°C) Ratiometry. The A3515xUA and A3516xUA feature a ratiometric output. The quiescent voltage output and sensitivity are proportional to the supply voltage (ratiometric). The per cent ratiometric change in the quiescent voltage output is defined as ∆VOQ(∆V) = VOQ(VCC) / VOQ(5V) VCC / 5 V x 100% (4) (1) and the per cent ratiometric change in sensitivity is defined as ∆Sens(∆V) = Sens(VCC) / Sens(5V) VCC / 5 V This calculation yields the device’s equivalent accuracy, over the operating temperature range, in gauss. Sensitivity. The presence of a south-pole magnetic field perpendicular to the package face (the branded surface) will increase the output voltage from its quiescent value toward the supply voltage rail by an amount proportional to the magnetic field applied. Conversely, the application of a north pole will decrease the output voltage from its quiescent value. This proportionality is specified as the sensitivity of the device and is defined as VO(500G) – VO(-500G) 1000 G x 100% (5) Linearity and Symmetry. The on-chip output stage is designed to provide a linear output to within 500 mV of either rail with a supply voltage of 5 V. This is equivalent to approximately ±800 gauss of ambient field. Although application of stronger magnetic fields will not damage these devices, it will force the output into a non-linear region. Linearity in per cent is measured and defined as VO(500G) – VOQ 2 (VO(250G) – VOQ) VO(-500G) – VOQ 2 (VO(-250G) – VOQ) Lin+ = (2) x 100% (6) Sens = The stability of sensitivity as a function of temperature is defined as ∆Sens(∆T) = Sens(TA) – Sens(25°C) Sens(25°C) Lin– = x 100% (7) and output symmetry as x 100% (3) Sym = VO(500G) – VOQ VOQ – VO(-500G) x 100% (8) www.allegromicro.com 5 3515 AND 3516 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS TYPICAL CHARACTERISTICS 1.4 9.0 Vcc = 5.5 V 1.2 Vcc = 5 V SUPPLY CURRENT IN mA 8.0 OUTPUT RESISTANCE IN Ω IO = 1.0 -1 m A IO = IO = 1m A 5 mA 0 mA 7.0 0.8 IO = 1 0.6 6.0 -50 -25 0 25 50 75 100 125 150 0.4 -50 -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE IN °C Dwg. GH-039-2 AMBIENT TEMPERATURE IN ° C Dwg. GH-060-1 2.55 2.54 6.0 A3515– 5.0 QUIESCENT OUTPUT VOLTAGE IN VOLTS 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 2.45 -50 0 -50 A3515– A3516– SENSITIVITY IN mV/G 4.0 3.0 A3516– 2.0 Vcc = 5 V Io = -1 mA Vcc = 5 V Io = -1 mA 1.0 -25 0 25 50 75 100 125 150 -25 0 25 50 75 100 125 150 AMBIENT TEMPERATURE IN °C Dwg. GH-067 AMBIENT TEMPERATURE IN ° C Dwg. GH-066 6 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 3515 AND 3516 RATIOMETRIC, LINEAR HALL-EFFECT SENSORS CRITERIA FOR DEVICE QUALIFICATION All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To become qualified, except for the destructive ESD tests, no failures are permitted. Qualification Test Temperature Humidity Bias Life Bias