EM MICROELECTRONIC - MARIN SA EM6415 Sensor Signal Conditioner Circuit with 14 bits A/D Converter Description The EM6415 is a high resolution A/D converter in low voltage CMOS technology intended to be used as a programmable link between one to four resistive sensors and a microcontroller. There is no need of external components for calibration, error curve compensation or offset and gain adjustment, nor external amplifiers and sensor bridge drive circuits. After exposure to a calibration signal/profile, all conversion parameters and profile coefficients are self calculated and stored in an external EEPROM. In addition to a programmable dual slope 10/13/14 bit A/D conversion, EM6415 allows individual compensation of not only sensor offset and full scale errors, but also temperature error compensation of the sensor zero point and sensitivity, dynamically during the conversion process. EM6415 also contains a programmable sensor drive current source. Features Full sensor system on chip Four sensor channel multiplexer Programmable Dual slope A/D converter Program selectable 10, 13 or 14 bit resolution ADC resolves 1V/Bit Programmable sensor offset, gain and linearity High flexibility in zero adjust and full scale adjust Sensor error compensation performed by software Parallel 4 bit microcontroller interface Self calibration of conversion parameters and profile coefficients Ultra low noise differential input amplifier with mask programmable gain Excellent linearity over full transfer curve Programmable current source for sensor supplies. Low supply voltage range 2.2V - 3.6 V Low operation current, 240 A at 800 kHz, 3V Ultra low power consumption (at standby or after conversion down to less than 0.1 A) Small SSOP36-300mils package Applications Portable sensor instruments Telemetry Resistive sensor interfaces Automotive sensors Industrial process control Consumer instruments Typical Application VDD AZN RSEN2 Sensor1 TS1 RINT10 VDDD RINT13_14 VDDA RSEN1 CI P3WAY CAZ CH1H CINT CE RD CE WR WR ALE STROBE RD MICROCONTROLLER CH1L TS2 Sensor2 CH2H EEPROM DATA D0-D3 EM6415 CH2L CLKP TS3 Sensor3 VDD CH3H CH3L CLKSEL LCD TS4 Sensor4 CH4H CH4L VSSD VSSA VREF Fig. 1 Copyright 2002, EM Microelectronic-Marin SA 1 www.emmicroelectronic.com EM6415 Block Diagram RSEN1 RSEN2 Programmable Current Source CH1 CE ALE WR 44-Bit D/A Converter RD D3 D2 D1 D0 Microcontroller Interface and Control Logic Power On Reset Detector 8 Bit D/A Converter Offset + Full Scale Calibration DC Bias Fixed Gain Amplifier TS1 CH1H CH1L CH2 CLKSEL TS2 CH2H CH2L CLKP CH3 TS3 CH3H CH3L 10 / 13 / 14 Bit CH4 Bandgap Voltage Reference TS4 CH4H CH4L Dual Slope RC AD Converter Oscillator Analog Multiplexer VREF RINT13_14 AZN P3WAY CINT Fig. 2 Copyright 2002, EM Microelectronic-Marin SA 2 www.emmicroelectronic.com EM6415 Absolute Maximum Ratings Parameter Supply Voltage Symbol VDD Min -0.3 Max 5.5 Voltage at remaining pins VPIN VSS-0.3 VDD+0.3 V Storage temperature Tstore -55 150 C Operating temperature Top -40 +85 C 25010 Cs Soldering Temperature*Time TSMAX Electrical Characteristics Operating Conditions (unless othewise specified) Positive supply VDD VSS Negative supply T Ambient temperature Sensor resistance RSEN Unit V = = = = Stresses above these listed maximum ratings may cause permanent damages to the device. Exposure beyond specified operating conditions may affect device reliability or cause malfunction. Handling Procedures This device has built-in protection against high static voltages or electric fields; however, anti-static precautions must be taken as for any other CMOS component. Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the voltage range. Unused inputs must always be tied to a defined logic voltage level. 3.0V 0V 25C 300 to 10K Power Supply Parameter Symbol Conditions Min. Typ. Max. Unit 2.2 3.0 3.6 V 0.2 1.0 A 240 300 A Operating Voltage Range VDD T = -20C to 70C Current Consumption IDD1 CE =VDD at standby IDD2 CE =VSS at A/D conversion fADOSC=800kHz 100 Programmable Internal Oscillator Parameter Symbol Conditions Min. Typ. Max. Unit Frequency fADOSC D1,D0 = 00 350 500 800 kHz Frequency Step Size fADOSC 40 70 120 kHz Stability Against Supply Voltage Variations f/fVDD 2.2V< VDD <3.0V Stability Against Temperature Variations f/T -20C 1.5V For lowest ADC jitter, chose ramp height > 1.5V. To do so, run A/D ramp height conversion and read CC (conversion complete, LAD8, Bit0). Lower the clock frequency until CC=0. Note 8: Sensor bridge signal, e.g. pressure (CH1L - CH1H) Note 9: Power supply voltage of EM6415 circuit Copyright 2002, EM Microelectronic-Marin SA 8 www.emmicroelectronic.com EM6415 Integrator This signal can be seen on pin CINT D 8Bit A A D 8Bit FS ROUGH ADJUST OFFSET ROUGH ADJUST min. 1.5V for 14Bit at 3V power supply dV2 0.720V dV1 t1 D 12Bit t2 t3 14Bit ADC OUTPUT A FS FINE ADJUST Fig. 5 Integrator ramp Time t1 t2 t3 Phase Autozero phase FS fine adjust FS rough adjust Execution Set up of integrator starting point Signal integration with preprogrammed counter time length t2 De-integration with preprogrammed reference voltage, time length of t3 = ADC output counts dV1 is the Offset Rough Adjust dV2 is the Integrator Ramp Length Offsets and other system mismatch such as the zero drift of operational amplifiers, long term instabilities or supply voltage fluctuations are cancelled during the Autozero phase. Sensitivity and full-scale range adjustments are done during rampup and rampdown of the dual slope integrator. Copyright 2002, EM Microelectronic-Marin SA 9 www.emmicroelectronic.com EM6415 Pad Description & Pin Assignment in SSOP36 I: PIN Nr 10 11 12 13 14 15 16 17 18 19 20 21 2 1 36 35 31 32 33 Name TS1 CH1H CH1L TS2 CH2H CH2L TS3 CH3H CH3L TS4 CH4H CH4L D0P D1P D2P D3P I/O CE I/O I/O I/O I/O I I I 34 22 23 24 25 26 8 9 3 5 6 7 29 30 27 4, 28 WR I RD ALE CINT AZN P3WAY RINT13_14 RINT10 RSEN1 RSEN2 CLKP CLKSEL VDDD VDDA VSSA VSSD VREF NC Input I I O Description Top of sensor1 bridge connection pin Sensor1 channel high signal in Sensor1 channel low signal in Top of sensor2 bridge connection pin Sensor2 channel high signal in Sensor2 channel low signal in Top of sensor3 bridge connection pin Sensor3 channel high signal in Sensor3 channel low signal in Top of sensor4 bridge connection pin Sensor4 channel high signal in Sensor4 channel low signal in Microprocessor Port Data 0 Microprocessor Port Data 1 Microprocessor Port Data 2 Microprocessor Port Data 3 Read strobe for BUS read (active low) Address latch enable (active low) Chip enable (active low) Write strobe for BUS write (active low) Connection to integrator capacitor Connection to auto-zero capacitor 3 way connection for integrator Connection of resistor for integrator Connection of resistor for integrator when 10 bit conversion used Resistor to select sensor bridge1 maximum drive current Resistor to select sensor bridge2 maximum drive current External clock input Internal/external clock select Positive supply voltage of digital part Positive supply voltage of analog part Negative supply voltage of analog part Negative supply voltage of digital part Reference voltage Not connected O: Output Copyright 2002, EM Microelectronic-Marin SA 10 www.emmicroelectronic.com EM6415 Package Information SSOP36 - 300 mils Symbol A A1 A2 B C D E e H h L X Common dimensions (inches) Min Nom Max 0.097 0.101 0.104 0.0050 0.009 0.0115 0.090 0.092 0.094 0.012 0.014 0.017 0.0091 0.010 0.0125 0.602 0.607 0.612 0.292 0.296 0.299 0.0315 BSC 0.400 0.406 0.410 0.010 0.013 0.016 0.024 0.032 0.040 0.085 0.093 0.100 0 5 8 Copyright 2002, EM Microelectronic-Marin SA Note Symbol A A1 A2 B C D E e H h L X 11 Common dimensions (mm) Min. Nom Max 2.46 2.56 2.64 0.127 0.22 0.29 2.29 2.34 2.39 0.31 0.36 0.43 0.23 0.25 0.32 15.29 15.42 15.54 7.42 7.52 7.59 0.80 BSC 10.16 10.31 10.41 0.25 0.33 0.41 0.61 0.81 1.02 2.16 2.36 2.54 0 5 8 Note www.emmicroelectronic.com EM6415 Ordering Information The EM6415 has metal mask options for the Gain of the Input Amplifier (between 1 and 150 max) and for the Offset Adjust Range. Contact EM Microelectronic for availability of different options not shown in table below. Please make sure to order the exact Part Number when ordering. Part Number Version Input Amplifier Gain V1 5 Separate Registers for each sensor -40mV to +40mV V2 5 Common Registers for the 4 sensors -40mV to +40mV V3 150 Separate Registers for each sensor -40mV to +40mV V% custom EM6415V1WS11 EM6415V1SS36A EM6415V1SS36B EM6415V2WS11 EM6415V2SS36A EM6415V2SS36B EM6415V3WS11 EM6415V3SS36A EM6415V3SS36B EM6415V%WS11 EM6415V%SS36A EM6415V%SS36B OS/FS Rough Adjust (note 1) Offset Adjust Range custom custom Delivery Form Sawn wafer, 11 mils thickness 36-pin SSOP, Stick 36 pin SSOP, Tape & Reel Sawn wafer, 11 mils thickness 36-pin SSOP, Stick 36 pin SSOP, Tape & Reel Sawn wafer, 11 mils thickness 36-pin SSOP, Stick 36 pin SSOP, Tape & Reel Sawn wafer, 11 mils thickness 36-pin SSOP, Stick 36 pin SSOP, Tape & Reel Note 1: LAD 3, 4, 5, 6 For die size information and pad location diagram, please contact EM Microelectronic-Marin SA. EM Microelectronic-Marin SA cannot assume responsibility for use of any circuitry described other than circuitry entirely embodied in an EM Microelectronic-Marin SA product. EM Microelectronic-Marin SA reserves the right to change the circuitry and specifications without notice at any time. You are strongly urged to ensure that the information given has not been superseded by a more up-to-date version. (c) EM Microelectronic-Marin SA, 11/02, Rev. B Copyright 2002, EM Microelectronic-Marin SA 12 www.emmicroelectronic.com