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| Data Sheet MC01 Digitally Trimmed Sensor Signal Conditioner General Description The MC01 provides a highly integrated interface for sensors, optimized for resistive bridge sensor calibration and compensation with minimum external components. It provides a 2-bit programmable current source for biasing of external sensors, a 4bit programmable-gain instrumentation amplifier, two 10-bit Digital-to-Analog converters and an 88-bit EPROM for storing the calibration data and configuring the device. The signal processing tasks performed include 10-bit Analog-to-Digital Conversion, averaging, and compensation of offset, offset temperature coefficient, full-span output, as well as full-span output temperature coefficient. It also performs correction of zero position and sinusoidal nonlinearity -e.g., that of Infineon Giant Magnetoresisive Sensors (GMR)-. Either analog or PWM outputs are provided. When interfacing the Infineon Giant Magnetoresisive Sensor, the device provides the angular position of a standard magnet centered above the sensor. A programmable range covering up to 110 is divided into 512 steps (9 bits of resolution). In the PWM output configuration the PWM duty cycle limits are programmable, as well as the zero position. The device is insensitive to the peak magnetic field, magnetic offset and displacement of the magnet. Built-in testability features of the MC01 allow to speed up, automate, and simplify the calibration and compensation of the device. Although optimized for use with Infineon Giant Magnetoresistive sensors, the MC01 may also be used with other resistive sensors (piezoresistive sensors, accelerometers and strain gauges) with some external components and off-chip linearization (if needed). Features * * * * * * * * Accurate Single-Chip Sensor Signal Conditioning Sensor Deviations Trimmed Using Correction Coefficients Stored in Internal EPROM. Compensation of Offset, Offset TC, Full-Scale Output, Full-Scale Output TC, and Sinusoidal Nonlinearity Power Supply selectable: a) 6.5 -30V (40V for 20000 s) b) 5V Programmable Current Source (2.5 mA to 4 mA, 4 Steps) for Sensor Biasing Programmable Analog Gain (18 to 64, 16 Steps) 9 bit Resolution (Higher Resolution Under Development) Wide Temperature Range. Pin Configuration VDD VB OUT NC GND PROG PW1 PDB SENS0 SENS1 SENS2 TESTCK REXT RESETN CLK2 CLK1 Fig. 1. MC01 pinout Applications - When used with the GMR sensor: Contactless potentiometer Absolute position sensor PC mouse - When used with other resistive sensors: Piezoresistive Pressure and Acceleration Transducers Automotive Systems Hydraulic Systems Strain-Gauge Sensors 1 Data Sheet MC01 TECHNICAL DATA MIN SUPPLY VOLTAGE TYP 12 5 3 30 5.5 4 MAX UNITS V V mA V VB, supply voltage VB, supply voltage (5V op. mode) CURRENT SOURCE 6.5 4.5 2.5 VSS+1.4 18.1 Bride current range Bridge voltage swing PROG. GAIN AMPLIFIER Gain Range D/A CONVERTERS VDD -1.4 25.3 10 0.25 64 Resolution Differential Nonlinearity Input Voltage 0.5 bits LSB 4.5 V Relative to peak COMPENSATION RANGES (for Infineon GMR interfacing) Electrical offset correction range < -50% >50% sensor input ampl. Mechanical offset correction range Digital gain correction range Operating temperature range -13.75 0 13.75 2 -40 to 125 (under validation) C Centered on ref. position Relative to ref. position OUTPUT CHARACTERISTICS (for Infineon GMR interfacing) Angular range a 16 9 bits 0.19% 0% 194 20 7.8 200 110 Angular resolution PWM output resolution PWM duty cycle limits b PWM frequency PWM rise time/fall time c Analog output resolution NOTES: a b c 100% 206 30 Hz s mV angular range selectable from 16 to 110 in 1024 steps PWM duty cycle limits symmetrical: L% to (100-L)%, L selectable from 0%-50% in 256 steps PWM rise/fall times when slope control option is set 2 Data Sheet MC01 PIN DESCRIPTION (SOIC16 PACKAGE) PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DESCRIPTION VDD output from internal voltage regulator. Supply input for 5V applications, where pins 1 and 2 are shorted. Connect a 0.1F capacitor from VDD to GNG. VB Battery voltage input OUT Analog/PWM output. Externally pulled to VB. NC Leave unconnected GND Ground Input PROG PROM Buffered DC Programming Input PW1 Pulse Width Signal for PROM Programming PDB Power Down for PROM CLK1 Clock for selection of PROM Zener diodes. Must be synchronized with PW1 for programming CLK2 Clock for PROM Zener diode read, or data input for test pattern RESETN Input for PROM reset and mode selection. REXT External resistor for internally generating bias currents and clock frequency TESTCK External test clock SENS2 Negative terminal of differential input SENS1 Positive terminal of differential input SENS0 Bridge voltage/Current bias output SCHEMATIC DIAGRAM NAME VDD VDD VOLTAGE REGULATOR VB SENS0 SENSOR BIAS DIGITAL PART OUTPUT DRIVER OUT SENS1 SENSOR BRIDGE SENS2 INPUT AMPL ADC REXT BIAS OSC CALIBRATION PROM GND CLK1 CLK2 PW1 PDB RESETN PROG R Figure 2. MC01 architecture 3 |
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