SENSOR PRODUCTS Preliminary APPLICATIONS Compassing Navigation Systems Two-Axis Magnetic Sensors HMC1052 Attitude Reference Traffic Detection Medical Devices Position Sensing B reakthrough design contains a compact, high performance two-axis magnetoresistive sensors on a single chip. Advantages of this patented design include perfectly orthogonal two-axis sensing, ultra small size and low power in a 10-pin miniature surface mount package. FEATURES AND BENEFITS Low Power Supply voltage could be as low as 1.8V. Small Package Available in a 10-pin miniature surface mount package (MSOP) with total mounting envelope of 3mm x 3mm x 1mm. High Performance Sensitivity of 1mV/V/Oe with a wide field range up to +/- 6 Oe. High Accuracy Nearly perfect orthogonal two-axis sensing (Error < 0.01°) and matched sensitivity on both axis eliminates errors in compassing applications. On-Chip Coils Patented on-chip set/reset straps reduces the effects of temperature drift, non-linearity errors and loss of signal output due to the presence of high magnetic fields. HMC1052 SENSOR PRODUCTS BASIC DEVICE OPERATION HMC1052 is a two-axis linear magnetic field sensor. Like the other Honeywell HMC10xx devices, each sensor is a resistive Wheatstone bridge formed by a magnetoresistive metal film. When a power supply is connected to the bridge, the sensor converts any ambient or applied magnetic field in the sensitive direction to a voltage output. This device contains two magnetic field sensors with sensitive directions perpendicular to each other; Sensor A and Sensor B coexist on a single silicon chip with nearly perfect orthogonality and matching characteristics. This patented design offers several advantages including small chip size, low operating voltage and eliminates orthogonality errors caused by two chips. In addition to the Wheatstone bridges, HMC1052 has two on-chip magnetically coupled straps – the OFFSET strap and the SET/RESET strap. Sensor A and Sensor B share the same OFFSET strap and the SET/RESET strap. These two straps provide localized magnetic fields to sensitive and insensitive directions for Sensor A and Sensor B, respectively. The SET/RESET strap can be used to ensure high accuracy and to flip the polarity of the output response.The OFFSET strap can be used to calibrate the sensor or to offset any undesired stray field. For more information on OFFSET and SET/RESET straps, please refer to Honeywell data sheet “1- and 2-Axis Magnetic Sensors”. In the standard MSOP 10-pin package, these two sensors can be powered independently for low power consumption. However, there is no access to OFFSET strap in this package. For applications that requires the OFFSET strap, an alternative package can be assessed and implemented. LOW VOLTAGE SET/RESET CIRCUIT. 200 Ω 1.8V HMC1052 S/R strap(s) 1µF 0.1µF S/R FDC6327C Si1555DL or ZXMD63C02X S/R +2.5-5V HMC1052 100K SW1 Vb 200 Ω SR+ 2.2uF tantalum (low R) Out- - Out+ + Vout AMP623 R SR- Gnd R 1) Allow capacitor to charge up to supply (~1 sec.) 2) Momentarily close switch SW1. This creates a >0.5A SET pulse. 3) Wait 1msec for settling, then measure output (Out+ - Out-) 2 Gnd HMC1052 SENSOR PRODUCTS HMC1052 PRELIMINARY SPECIFICATIONS Characteristic Conditions* Min Typ Max Unit Bridge Supply Vbridge referenced to GND 1.8 2.5 20 Volts Bridge Resistance Bridge current = 1mA Operating Temperature Ambient -40 125 °C Storage Temperature Ambient, unbiased -55 150 °C Field Range Full scale (FS) — total applied field -6 +6 gauss Linearity Error Best fit straight line ±1 gauss ±3 gauss ±6 gauss 0.05 0.4 1.6 %FS Hysteresis Error 3 sweeps across ±3 gauss 0.1 %FS Repeatability Error 3 sweeps across ±3 gauss 0.1 %FS Bridge Offset Offset = (OUT+) - (OUT-) Field=0 gauss after Set pulse ±1 mV/V Sensitivity Set/Rest Current = 0.5A 1.0 mV/V/gauss Bandwidth Magnetic signal (lower limit = DC) 5 MHz OFFSET Strap Ω Measured from OFFSET+ to OFFSET- 15 Ω OFFSET Strap Ω Tempco TA=-40 to 125°C 3900 ppm/°C OFFSET Strap Constant DC Current Field applied in sensitive direction 10 mA/gauss Set/Reset Strap Ω Measured from S/R+ to S/R- 4 Ω Set/Reset Current 0.1% duty cycle, or less, 2µS Current Pulse 0.5 Amp Set/Reset Strap Ω Tempco TA=-40 to 125°C 3700 ppm/°C Disturbing Field Sensitivity starts to degrade. Use S/R pulse to restore sensitivity. Sensitivity Tempco TA=-40 to 125°C -3000 ppm/°C Bridge Offset Tempco TA=-40 to 125°C ±500 ppm/°C Bridge Ω Tempco Vbridge=5V, TA= -40 to 125°C 2500 ppm/°C Sensitivity Ratio of X,Y Sensors TA= -40 to 125°C X,Y sensor Orthogonality Sensitive direction in X and Y sensors Max. Exposed Field No perming effect on zero reading Ω 1000 20 99 * Tested at 25°C except stated otherwise 3 gauss 101 103 % 0.01 degree 10000 gauss HMC1052 SENSOR PRODUCTS PINOUT DRAWINGS GND (B) OUT+ (B) GND2 (A) OUT+ (A) VBRIDGE • 1 2 3 4 5 10 9 8 7 6 A B OUT- (A) GND1 (A) S/ROUT- (B) S/R+ Arrow indicates direction of applied field that generates a positive output voltage after an Iset. MR SENSOR CIRCUIT VBRIDGE(5) R R R R A B OUT(10) OUT+ OUT(4) (7) R GND1 (9) R OUT+ (2) R R GND (1) GND2 (3) R set/reset S/R + (6) S/R (8) Iset, -Ireset PACKAGE DRAWING 10-PIN MSOP D A1 A E E1 1 • e b Symbol A A1 b D E1 e E L1 Inches x 10E-3 Millimeters Max Min Max Min 0.05 0.15 2.90 2.90 0.50 BSC 4.75 0.95 BSC 1.10 0.15 0.30 3.10 3.10 5.05 2.0 5.9 114 114 2.0 BSC 187 37.4 43 5.9 11.8 122 122 199 Honeywell reserves the right to make changes to any products or technology herein to improve reliability, function or design. Honeywell does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. E-Mail: [email protected] Web Sites: www.ssec.honeywell.com www.magneticsensors.com 900265 1/01 Solid State Electronics Center 12001 State Highway 55 Plymouth, MN 55441 1-800-323-8295