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MITSUBISHI
M62301SP,FP
10~12-BIT 4CH INTEGRATING A-D CONVERTER
DESCRIPTION
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.
PIN CONFIGURATION (TOP VIEW)
Vcc FOR RESET C0 C1 C2 INT RESET GIRDLING 1 GIRDLING 2 ANALOG GND
1 2 3 4 5 6 7 20 19 18 17 16
DIGITAL GND A1 A2 A3 A4 DIGITAL VDD
15 REFERENCE INPUT 14 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...............................................526s/ch(typ) *Built-in system reset.........................................4.45V(typ)
INTEGRATING 8 CAPACITOR 9 10
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
BLOCK DIAGRAM
DIGITAL CONSTANT ANALOG CURRENT Vcc ANALOG GND DIGITAL CONTROL GND VDD
12
A1 A2 A3 A4
11
10
20
14
19 18 17 16
A1 A2 A3 A4 VREF GND
DISCHARGE +
+
0.49V
+
5
INT
0.36V
REFERENCE 15 INPUT
1
150s DELAY CIRCUIT
Vcc FOR RESET RESET
6
REFERENCE 13 VOLTAGE VREF
1.22V
DECODER
7
GIRDLING 1
8
9
2
3
4
INTEGRATING CAPACITOR
C0 C1 C2
GIRDLING 2
MITSUBISHI ELECTRIC
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MITSUBISHI
M62301SP,FP
10~12-BIT 4CH INTEGRATING A-D CONVERTER
ABSOLUTE MAXIMUM RATINGS(Ta=25C, unless otherwise noted)
Symbol Vcc VDD VID VIA IoINT IoRE VINT VRESET VRE Pd K Topr Tstg Parameter Analog section supply voltage Digital section supply voltage Digital input voltage Analog input voltage INT output current Reset output current INT output withstand voltage Reset output withstand voltage Reset supply voltage Power dissipation Thermal derating Operating temperature Storage temperature Conditions Ratings 15 8 -0.3~VDD+0.3 -0.3~VDD+0.3 6 6 15 15 6 990(DIP)/660(FP) 9.9(DIP)/6.6(FP) -20 ~ +75 -55 ~ +125 Unit V V V V mA mA V V V mW mW/C
C C
RECOMMENDED OPERATING CONDITIONS(Ta=25C, unless otherwise noted)
Symbol Vcc VDD VIA VIR CI RI Io Parameter Analog section supply voltage Digital section supply voltage Analog input voltage range (II=50A) Reference input voltage(II=50A) Integration capacity
Resistance to determine charge current
Limits
Min Typ Max
Unit V V V V pF k mA
4.5 4.5 0 1 300 6
8.0 5.0
12.0 5.5 No more than(Vcc-2.5V) and VDD(Note 1) No more than(Vcc-2.5V) and VDD(Note 1) 22000 60 4
Output current
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
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MITSUBISHI
M62301SP,FP
10~12-BIT 4CH INTEGRATING A-D CONVERTER
ELECTRICAL CHARACTERISTICS(Vcc=5.0V,VDD=5.0V,Ta=25C, unless otherwise noted)
Symbol Icc VIA Parameter Supply current Analog input voltage range Reference input voltage
+ -
Test conditions
Min.
Limits Typ. 1.0
Max. 2.0 2.5 2.2
Unit mA V
II=100A II=200A IREF=5A CREF=4700pF
0
VREF IREF IREF Ec EL TT Tdi IB VIH VIL VLINT IOHINT VDET VDET TDE VLRE IOHRE IRE VOPL
1.17
1.22
1.27 50 -10 0.1 0.09
V A %/FSR %/FSR s
Permissible current inflow at reference voltage Conversion error Linear error Conversion time Discharge time 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 (Note 1)RI=24k (Note 2)RI=24k VIA=2.5V,CI=0.01F RI=24k V 8=3V 0.3V CI=4700pF 3.5 IOL=1mA V 5=15V 4.30 30 75 IOL=1mA V 5=15V VRE=5V RL=2.2k,VLRE0.4V RL=100k,VLRE0.4V 0.1 4.45 50 150 0.1 1.0 0.75 0.6 0.05 0.02 526 3 -0.35
17 -3.5 0.8 0.4 1 4.60 80 300 0.4 1 2.0 1.0 0.8
s A V V V A V mV s V A mA 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
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MITSUBISHI
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 C1 C2 1 0 0 0 Discharge 2 1 0 0 GND 3 0 1 0 VREF
from integration capacitor (CI) is performed.None of these operations is performed when the "mode 8" input is given:
4 1 1 0 A1
5 0 0 1 A2
6 1 0 1 A3
7 0 1 1 A4
8 1 1 1
(2)A-D conversion
DECODER SELECTION MODE 1 2 1 3 1 4~7 1
VIN+0.49V V8 VREF+0.49V 0.49V 0.36V
TGND
TREF
TIN
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
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.
By measuring voltage at the maximum input for approximately 500s under the counter clock of 8MHz,resolution of approximately 12bits can be obtained; 500s . 12 =2 125ns .
MITSUBISHI ELECTRIC
( 4 /9)
MITSUBISHI
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= 1.22 (A)........................(1) RI Integration time TI can be calculated as follows; TI=(VIN+0.49) CI II .............(2) II VREF
13 12 8
1.22V
RI
CI
(However,parameters such as built-in comparator offset voltage,analog switch offset,voltage leak current and delay time are not counted.)
4.45V
50mA
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 150sec.
MITSUBISHI ELECTRIC
( 5 /9)
MITSUBISHI
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
10k 10k
1 2 20 19 18 17 16 15 14 13 12 11
CREF:To stabilize reference voltage, be sure to connect capacitance of approximately 4700pF. CINT:We suggest that this capacitance be connected to prevent malfunction due to noise.
TO MICROCOMPUTER CONTROL PIN TO COUNTER TO RESET CINT 680PF
3 4 5 6 7 8 9
INPUT ANALOG VOLTAGE
CREF
4700pF
50A
10
Use CI that leaks as slight current as possible.To prevent leak to the circuit board,we recommend providing girdling 7 , 9
II=50A RI 24k
CI 4700pF
. Charge current II = 1.22V = 50A . 24k
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; 4700pFX (2.5+0.13) 50A 1 8M . 11 =2 .
Therefore,the resolution of this system is approximately 11 bits.
MITSUBISHI ELECTRIC
( 6 /9)
MITSUBISHI
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.
TO MICROCOMPUTER 5V POWER SUPPLY 8V CREF:To stabilize reference voltage, be sure to connect capacitance of approximately 4700pF. CINT:We suggest that this capacitance be connected to prevent malfunction due to noise.
10k 10k
1 2 20
A1 19 A2 18 A3 17 A4 16
2.5V 15
TO MICROCOMPUTER CONTROL PIN TO COUNTER TO RESET CINT 680pF
3 4 5 6 7 8 9
INPUT ANALOG VOLTAGE
VDD 14
13 12 11
50A
10
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=50A girdling 7 , 9 RI 24k
CI 6800pF
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) 50A . 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 11-bit 12-bit 10-bit Change current II(A) 50 100 50 100 50 100 Resistance to determine constant current RI(k) 24 12 24 12 24 12 24 12 24 12 24 12 Integration capacitance CI 1400pF 2800pF 2800pF 5600pF 5600pF 12000pF 700pF 1400pF 1400pF 2800pF 2800pF 5600pF Discharge time Tdi(s) 7.7 15.4 15.4 30.7 30.7 65.9 3.9 7.7 7.7 15.4 15.4 30.7
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.
MITSUBISHI ELECTRIC
( 7 /9)
MITSUBISHI
M62301SP,FP
10~12-BIT 4CH INTEGRATING A-D CONVERTER TYPICAL CHARACTERISTICS
THERMAL DERATING ANALOG PART SUPPLY CURRENT VS.SUPPLY VOLTAGE
1000 800 600
2.0
1.0 400 200 0 0
0
25
50
75
100
125
0
5
ANALOG Vcc (V) LINEAR ERROR
10
AMBIENT TEMPERATURE Ta(C) STANDARD VOLTAGE VS. AMBIENT TEMPERATURE
1.24 1.23 1.22 1.21 1.20 1.19 -20
0.05 0.04 0.03 0.02 0.01 0 0 (OSR) 1.0
RI=24k RI=12k
0
20
40
60
80
2.0
AMBIENT TEMPERATURE Ta (V) INT OUTPUT "L" LEVEL VS.OUTPUT CURRENT
2.5 (FSR)
ANALOG INPUT RANGE VIA(V)
INT OUTPUT VS.AMBIENT TEMPERATURE
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.1 1 10
INT OUTPUT CURRENT IO INT (mA)
200
100
0 -20
0
20
40
60
80
AMBIENT TEMPERATURE Ta (C)
MITSUBISHI ELECTRIC
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8/9)
MITSUBISHI
M62301SP,FP
10~12-BIT 4CH INTEGRATING A-D CONVERTER
RESET SUPPLY CURRENT VS. SUPPLY VOLTAGE
DETECTION VOLTAGE vs. AMBIENT TEMPERATURE
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 012
4.7 4.6 4.5 4.4 4.3 4.2 3 45 6 7 8 9 10 -20 0 20 40 60 80
RESET VOLTAGE Vcc VRE (V) RESET OUTPUT "L" LEVEL VS.OUTPUT CURRENT AMBIENT TEMPERATURE Ta(C) DELAY TIME VS.AMBIENT TEMPERATURE
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.1 1 10
RESET OUTPUT CURRENT IORE (mA)
250 200 150 100 50 0 -20
0
20
40
60
80
AMBIENT TEMPERATURE Ta(C)
LIMIT RESET VOLTAGE
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 0.6 1.0 2.0
RL=2.2k RL=100k
RESET VOLTAGE Vcc VRE (V)
MITSUBISHI ELECTRIC
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