MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER DESCRIPTION PIN CONFIGURATION (TOP VIEW) M62301 semiconductor integrated circuit forms an integrating A-D converter,being connected to a microcomputer unit.By using selection signals and counter clock signals from the unit,a 10~12-bit A-D converter can be created at a low cost. The integration time and resolution can be set at the user‘s option by changing external parameters.In addition,the built-in circuit offset,delay time and temperature fluctuation are adjustable,enabling a wide range of applications. M62301 has a 3 input decoder circuit,high-precision reference voltage(1.22V)generator,current supply and comparator for integration,and voltage-monitoring reset circuit for a 5V power supply.It is also equipped with girdling to prevent current leak from integration capacitor. Vcc FOR RESET 1 20 DIGITAL GND C0 C1 2 19 A1 3 18 A2 C2 4 17 A3 INT 5 16 A4 RESET 6 15 REFERENCE INPUT GIRDLING 1 7 14 INTEGRATING 8 CAPACITOR 13 FEATURES •Separate power supplies for analog section and digital section. •Low power dissipation.....................................2mA(typ) (1mA for A-D conversion and the other 1mA for reset) •Linear error......................................................±0.02%(typ) •Conversion time...............................................526µs/ch(typ) •Built-in system reset.........................................4.45V(typ) GIRDLING 2 9 ANALOG GND 10 DIGITAL VDD REFERENCE VOLTAGE 12 CONSTANT CURRENT CONTROL 11 ANALOG Vcc Outline 20P4B(SP) 20P2N-A(FP) APPLICATION High-precision control systems such as temperature control and speed control DIGITAL CONSTANT ANALOG CURRENT Vcc ANALOG GND DIGITAL CONTROL GND VDD BLOCK DIAGRAM 12 A1 19 A2 18 A3 A4 10 11 20 14 A1 A2 A3 17 + 5 - 0.49V INT + - A4 16 0.36V VREF REFERENCE 15 INPUT 150µs GND + DISCHARGE REFERENCE 13 VOLTAGE - 1 Vcc FOR RESET 6 RESET DELAY CIRCUIT DECODER VREF 1.22V 7 8 9 INTEGRATING CAPACITOR GIRDLING 1 3 2 4 C0 C1 C2 GIRDLING 2 MITSUBISHI ELECTRIC ( 1 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER ABSOLUTE MAXIMUM RATINGS(Ta=25°C, unless otherwise noted) Symbol Vcc VDD VID VIA IoINT IoRE VINT VRESET VRE Pd K Topr Tstg Conditions Parameter Analog section supply voltage Digital section supply voltage Digital input voltage Analog input voltage INT output current Reset output current Ratings 15 Unit V 8 -0.3~VDD+0.3 -0.3~VDD+0.3 6 V V V mA mA V V V mW mW/°C 6 INT output withstand voltage Reset output withstand voltage Reset supply voltage 15 15 6 990(DIP)/660(FP) 9.9(DIP)/6.6(FP) Power dissipation Thermal derating Operating temperature Storage temperature -20 ~ +75 °C °C -55 ~ +125 RECOMMENDED OPERATING CONDITIONS(Ta=25°C, unless otherwise noted) Symbol Parameter Vcc VDD Analog section supply voltage Digital section supply voltage VIA Analog input voltage range (II=50µA) VIR Reference input voltage(II=50µA) CI Integration capacity RI Io Resistance to determine charge current Limits Min Typ Max 4.5 4.5 8.0 5.0 12.0 5.5 Unit V V 0 No more than(Vcc-2.5V) and VDD(Note 1) V 1 No more than(Vcc-2.5V) and VDD(Note 1) V 300 6 Output current 22000 60 4 pF kΩ mA Note 1.Maximum analog input voltage is less than the difference between Vcc-2.5V as well as VDD. *Charging current II= VREF R1 MITSUBISHI ELECTRIC ( 2 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER ELECTRICAL CHARACTERISTICS(Vcc=5.0V,VDD=5.0V,Ta=25°C, unless otherwise noted) Symbol Min. Supply current Icc Analog input voltage range VIA II=100µA Reference input voltage + - Limits Typ. Max. 1.0 2.0 IREF=±5µA CREF=4700pF 1.17 1.22 1.27 50 -10 0.1 0.09 Permissible current inflow at reference voltage (Note 1)RI=24kΩ (Note 2)RI=24kΩ 0.05 0.02 TT Conversion time VIA=2.5V,CI=0.01µF RI=24kΩ 526 Tdi Discharge time V 8=3V 0.3V CI=4700pF IB VIH VIL VLINT IOHINT VDET ∆VDET TDE VLRE IOHRE IRE Analog input current Digital input “H“ level Digital input “L“ level INT output “L“ level INT output leak current Detection voltage Hysteresis voltage Delay time Reset output “L“ level Reset output leak current Supply current Limit operating voltage mA V 2.2 Conversion error Linear error VOPL Unit 2.5 0 II=200µA VREF IREF IREF Ec EL Test conditions Parameter V µA %/FSR %/FSR µs 3 17 µs -0.35 -3.5 µA V V V µA V mV µs V µA mA 3.5 0.1 IOL=1mA V 5=15V 4.30 30 75 IOL=1mA V 5=15V VRE=5V 4.45 50 150 0.1 1.0 RL=2.2kΩ,VLRE≤0.4V RL=100kΩ,VLRE≤0.4V 0.75 0.6 0.8 0.4 1 4.60 80 300 0.4 1 2.0 1.0 0.8 V Note 1.Conversion error;Deviation from the line that links the “0“ scale point (mode 0) and reference scale point (mode 3. VFSR=2.5V).Associated with all channels. Note 2.Linear error;Deviation from the line that links the 0-V input point and 2.5V input point on a given channel. MITSUBISHI ELECTRIC ( 3 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER OPERATING DESCRIPTION (1)Decoder Based on digital inputs to C0,C1,C2,the analog switch is set to on,and the input of "0" scale (GND input),input of reference scale (reference voltage input),input to A1~A4,or discharge Mode C0 1 2 3 1 0 C1 0 0 0 C2 0 0 1 0 GND VREF Discharge from integration capacitor (CI) is performed.None of these operations is performed when the "mode 8" input is given: 4 5 6 7 1 1 0 0 0 1 0 1 1 1 1 1 A1 A2 0 1 8 1 A4 A3 (2)A-D conversion DECODER SELECTION MODE 1 2 1 1 3 4~7 1 VIN+0.49V V 8 VREF+0.49V 0.49V 0.36V TGND Multiplexer first selects VGND,obtaining minimum pulse TGND.It then selects VREF,obtaining reference pulse TREF.Input is selected next,obtaining input pulse TIN.VIN is obtained by deducting TGND,as the offset,from TREF and TIN. VIN=VREF • TIN-TG TREF-TG By measuring voltage at the maximum input for approximately 500µs under the counter clock of 8MHz,resolution of approximately 12bits can be obtained; TREF TIN Note. To ensure discharge from capacitor CI,the decoder input as in the above diagram should stay in mode 1 at least for the period calculated above:Tdi=(CI X VIAmax+0.49 ) 1mA It is not necessary to measure TGND,and TREF for each channel. 500µs . 12 =2 125ns . MITSUBISHI ELECTRIC ( 4 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER (3)Constant current control Integrating current II can be obtained based on the reference voltage(1.22V)by the built-in high-precision generator and resistance RI. II II= 1.22 (A)........................(1) RI Integration time TI can be calculated as follows; TI=(VIN+0.49) VREF 1.22V CI II .............(2) 8 12 13 CI RI (However,parameters such as built-in comparator offset voltage,analog switch offset,voltage leak current and delay time are not counted.) 50mA 4.45V RESET SUPPLY VOLTAGE VRE 0.8V t RESET OUTPUT OUTPUT UNSETTLED TDE TDE t When voltage applied to pin VRE becomes less than 4.45V,the RESET output status becomes "L".If voltage increases over 4.50V,the RESET status becomes "H" within 150µsec. MITSUBISHI ELECTRIC ( 5 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER APPLICATION SUGGESTION 1.4-channel 11-bit A-D converter system TO MICROCOMPUTER 5V POWER SUPPLY 5V CREF:To stabilize reference voltage, be sure to connect capacitance of approximately 4700pF. 10k 10k TO MICROCOMPUTER CONTROL PIN TO COUNTER TO RESET CINT 680PF 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 INPUT ANALOG VOLTAGE CREF 50µA CI 4700pF 4700pF CINT:We suggest that this capacitance be connected to prevent malfunction due to noise. Use CI that leaks as slight current as possible.To prevent leak to the circuit board,we recommend providing girdling 7 , 9 II=50µA RI 24k . Charge current II = 1.22V =. 50µA 24kΩ Resolution depends on the number of microcomputer counter clock pulses that are generated while the INT output status is "high" at the maximum input voltage 2.5V (vcc-2.5V). When the microcomputer counter clock frequency is 8MHz,the resolution can be calculated by using the constant calculated above,as follows; (2.5+0.13) 50µA 1 8M 4700pFX . 11 =. 2 Therefore,the resolution of this system is approximately 11 bits. MITSUBISHI ELECTRIC ( 6 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER 2.4-channel 12-bit A-D converter system Separate power supplies to analog section and digital section, analog input voltage range mode wider up to VDD,external reference voltage for integration. 8V TO MICROCOMPUTER 5V POWER SUPPLY CREF:To stabilize reference voltage, be sure to connect capacitance of approximately 4700pF. 10k 10k 1 20 2 A1 19 3 A2 18 4 A3 17 TO COUNTER 5 A4 16 TO RESET 6 15 7 VDD 14 8 13 9 12 10 11 TO MICROCOMPUTER CONTROL PIN INPUT ANALOG VOLTAGE CINT:We suggest that this capacitance be connected to prevent malfunction due to noise. 2.5V CINT 680pF TO MICROCOMPUTER 5V POWER SUPPLY 4700pF CREF Use CI that leaks as slight current as possible.To prevent leak to the circuit board,we recommend providing II=50µA girdling 7 , 9 50µA CI 6800pF RI 24k When the counter clock frequency is 8MHz,resolution is: Because separate power supplies are provided for the analog are digital sections,the M62301 has two supply voltage Vcc and VDD,enabling a wide analog input voltage range VIA.The upper limit of the range is required to be no more than the difference between Vcc-2.5V as well as VDD,therefore,the analog input voltage range in this application is 0V to 5V. 6800pF X 1 8M (5 + 0.13) 50µA . 12 =. 2 An A-D converter system with resolution of approximately 12 bits can be formed. Recommended operational settings according to clock frequency,resolution,and time required for discharge(decoder mode 1) Counter clock Resolution 10-bit 8MHz Change current II(µA) 50 100 11-bit 50 100 12-bit 50 100 Resistance to determine constant current RI(kΩ) 24 12 24 12 24 12 24 12 24 12 24 12 50 100 50 16MHz 11-bit 100 50 12-bit 100 Note 1.Discharge time Tdi=(CI X VIAmax+0.49 ) 1mA The values in this table apply when VIAmax is 5V. 10-bit MITSUBISHI ELECTRIC Integration capacitance CI 1400pF 2800pF 2800pF 5600pF 5600pF 12000pF 700pF 1400pF 1400pF 2800pF 2800pF 5600pF Discharge time Tdi(µs) 7.7 15.4 15.4 30.7 30.7 65.9 3.9 7.7 7.7 15.4 15.4 30.7 ( 7 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER TYPICAL CHARACTERISTICS THERMAL DERATING ANALOG PART SUPPLY CURRENT VS.SUPPLY VOLTAGE 1000 2.0 800 600 1.0 400 200 0 0 25 50 100 75 0 125 0 5 ANALOG Vcc (V) AMBIENT TEMPERATURE Ta(°C) STANDARD VOLTAGE VS. AMBIENT TEMPERATURE LINEAR ERROR 1.24 0.05 1.23 0.04 1.22 0.03 1.21 0.02 1.20 0.01 1.19 -20 0 20 40 60 10 RI=24kΩ RI=12kΩ 0 80 AMBIENT TEMPERATURE Ta (V) 2.0 1.0 0 (OSR) 2.5 (FSR) ANALOG INPUT RANGE VIA(V) INT OUTPUT “L“ LEVEL VS.OUTPUT CURRENT INT OUTPUT VS.AMBIENT TEMPERATURE 1.0 0.9 200 0.8 0.7 0.6 0.5 100 0.4 0.3 0.2 0.1 0 0 0.1 1 0 -20 10 INT OUTPUT CURRENT IO INT (mA) 0 20 40 80 60 AMBIENT TEMPERATURE Ta (°C) MITSUBISHI ELECTRIC ( 8 / 9 ) MITSUBISHI<Dig.Ana.INTERFACE> M62301SP,FP 10~12-BIT 4CH INTEGRATING A-D CONVERTER DETECTION VOLTAGE vs. AMBIENT TEMPERATURE RESET SUPPLY CURRENT VS. SUPPLY VOLTAGE 2.0 4.7 1.8 1.6 4.6 1.4 1.2 1.0 4.5 0.8 4.4 0.6 0.4 4.3 0.2 4.2 0 0 1 2 3 4 5 6 7 8 9 10 -20 RESET VOLTAGE Vcc VRE (V) 0 20 40 60 80 AMBIENT TEMPERATURE Ta(°C) RESET OUTPUT “L“ LEVEL VS.OUTPUT CURRENT DELAY TIME VS.AMBIENT TEMPERATURE 250 1.0 0.9 200 0.8 0.7 150 0.6 0.5 100 0.4 0.3 0.2 50 0.1 0 0 0.1 1 0 -20 10 0 20 40 60 80 AMBIENT TEMPERATURE Ta(°C) RESET OUTPUT CURRENT IORE (mA) LIMIT RESET VOLTAGE 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 RL=2.2kΩ 0.4 RL=100kΩ 0.2 0 0 0.6 1.0 2.0 RESET VOLTAGE Vcc VRE (V) MITSUBISHI ELECTRIC ( 9 / 9 )