TC14433/A
3-1/2 Digit, Analog-to-Digital Converter
Features:
Description
•
•
•
•
•
•
•
•
•
•
The TC14433 is a low-power, high-performance,
monolithic CMOS 3-1/2 digit A/D converter. The
TC14433 combines both analog and digital circuits on
a single IC, thus minimizing the number of external
components.
Accuracy: ±0.05% of Reading ±1 Count
Two Voltage Ranges: 1.999V and 199.9 mV
Up to 25 Conversions Per Second
ZIN > 1000M Ohms
Single Positive Voltage Reference
Auto-Polarity and Auto-Zero
Overrange and Underrange Signals Available
Operates in Auto-Ranging Circuits
Uses On-Chip System Clock or External Clock
Wide Supply Range: ±4.5V to ±8V
This dual slope A/D converter provides automatic
polarity and zero correction with the addition of two
external resistors and two capacitors. The full scale
voltage range of this ratiometric IC extends from
199.9 millivolts to 1.999 volts. The TC14433 can
operate over a wide range of power supply voltages,
including batteries and standard 5-volt supplies.
Applications:
•
•
•
•
•
•
The TC14433A features improved performance over
the industry standard TC14433. Rollover, which is the
measurement of identical positive and negative
signals, is specified to have the same reading within
one count for the TC14433A. Power consumption of
the TC14433A is typically 4 mW, approximately onehalf that of the industry standard TC14433.
Portable Instruments
Digital Voltmeters
Digital Panel Meters
Digital Scales
Digital Thermometers
Remote A/D Sensing Systems
The TC14433/A is available in 24-Pin PDIP, 24-Pin
SOIC (TC14433 device only), and 28-Pin PLCC
packages.
Package Type
28-Pin PLCC
VAG
NC
VDD
3
2
1
28 27 26
Q2
VREF
4
Q3
VX
24-Pin PDIP (Wide)
24-Pin SOIC (Wide)
VAG
1
24 VDD
VREF
2
23 Q3
VX
3
22 Q2
R1
4
21 Q1
R1/C1
5
20 Q0
C1
6
19 DS1
CO1 9
21 DS2
7
18 DS2
CO2 10
20 DS3
8
17 DS3
DU 11
9
16 DS4
VEE 12
© 2008 Microchip Technology Inc.
13 VSS
22 NC
19 DS4
12 13 14 15 16 17 18
Note 1:
2:
OR
14 EOC
TC14433/A
NC 8
EOC
CLK0 11
23 DS1
NC
15 OR
C1 7
VSS
CLK1 10
24 Q0
VEE
DU
R1/C1 6
CLK0
CO2
25 Q1
CLK1
CO1
TC14433/A
R1 5
NC = No internal connection (In 28-Pin PLCC).
24-Pin SOIC (Wide) package, only for TC14433
device.
DS21394D-page 1
TC14433/A
Typical Application
MCP1525
+5V
VIN
20 kΩ
VOUT
1 µF
VSS
1 µF
-5V
+5V
300
kΩ
RC
VX
0.1 µF
11 10 2 12 24
23
22
21
4
20
5 TC14433
6
13
1
0.1 µF**
0.1 µF**
7
8
-5V
-5V
14013B
*R1 = 470 kΩ for 2V Range
*R1 = 27 kΩ for 200 mV Range
**Mylar Capacitor
DS4
DS3
DS2
DS1
Segment
Resistors
150Ω (7)
9
10
11
12
13
4543B 14
15
8 6 7
9
14
15 19 18 17 16
7
6
5
4
3
2
1
10
11
12
13
14
15
16
1413
-5V
-5V
-5V
6
5 S 1
Q
3 D
2
C RQ
4
8
9 D S Q 13
11 C Q 12
R
710 14
-5V
+5V
16
4
2
3
5
3
1
R1*
DS21394D-page 2
+5V
0.1 µF
+5V
Minus Sign
f g e d c b a
200Ω
MPS-A12 Plus Sign
-5V
110Ω
51 kΩ
Common
Anode Led
+5V
Display
50 µF
0.1 µF
MPS-A12
(4)
-5V
© 2008 Microchip Technology Inc.
TC14433/A
1.0
ELECTRICAL
CHARACTERISTICS
† Notice: Stresses above those listed under “Absolute
Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only and functional
operation of the device at these or any other conditions
above those indicated in the operation sections of the
specifications is not implied. Exposure to Absolute
Maximum Rating conditions for extended periods may
affect device reliability.
Absolute Maximum Ratings†
Supply Voltage (VDD – VEE) ................... -0.5V to +18V
Voltage on Any Pin:
Reference to VEE .....................-0.5V to (VDD + 0.5)
DC Current, Any Pin: ....................................... ±10 mA
Power Dissipation (TA ≤ 70°C):
Plastic PLCC ................................................. 1.0W
Plastic PDIP.............................................. 940 mW
SOIC ......................................................... 940 mW
Operating Temperature Range ............ -40°C to +85°C
Storage Temperature Range .............. -65°C to +160°C
TC14433/A ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, VDD = +5V, VEE = -5V, C1 = 0.1 µF, (Mylar), C0 = 0.1 µF,
RC = 300 kΩ, R1 = 470 kΩ @ VREF = 2V, R1 = 27 kΩ @ VREF = 200 mV, TA = +25°C.
Parameter
Symbol
Min
Typ
Max
Min
Typ
Max
Units
SYE
-1
—
+1
—
—
—
Counts
Test Conditions
Analog Input
Rollover Error (Positive) and
Negative Full Scale
Symmetry
Linearity Output Reading
(Note 1)
NL
Stability Output Reading
(Note 2)
SOR
Zero Output Reading
Bias Current: Analog Input
Reference Input
Analog Ground
Common mode Rejection
Note 1:
2:
3:
-0.05
+0.05
+0.05
—
—
—
%rdg
VREF = 2V
-1 count
—
+1 count
—
—
—
%rdg
VREF = 200 mV
—
—
2
—
—
—
LSD
VX = 1.99V,
VREF = 2V
—
—
3
—
—
—
LSD
VX = 199 mV,
VREF = 200 mV
VX = 0V, VREF = 2V
ZOR
—
0
0
—
—
—
LSD
IIN
—
±20
±100
—
—
—
pA
—
±20
±100
—
—
—
pA
—
±20
±100
—
—
—
pA
—
65
—
—
—
—
dB
CMRR
200 mV Full Scale
VIN -VIN = +VIN
VX = 1.4V, VREF = 2V,
FOC = 32 kHz
Accuracy – The accuracy of the meter at full scale is the accuracy of the setting of the reference voltage. Zero is
recalculated during each conversion cycle. The meaningful specification is linearity. In other words, the deviation from
correct reading for all inputs other than positive full scale and zero is defined as the linearity specification.
The LSD stability for 200 mV scale is defined as the range that the LSD will occupy 95% of the time.
Pin numbers refer to 24-pin PDIP.
© 2008 Microchip Technology Inc.
DS21394D-page 3
TC14433/A
TC14433/A ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: Unless otherwise specified, VDD = +5V, VEE = -5V, C1 = 0.1 µF, (Mylar), C0 = 0.1 µF,
RC = 300 kΩ, R1 = 470 kΩ @ VREF = 2V, R1 = 27 kΩ @ VREF = 200 mV, TA = +25°C.
Parameter
Symbol
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
Output Voltage
(Pins 14 to 23) (Note 3)
VOL
—
0
0.05
—
—
0.05
V
VSS = 0V, “0” Level
—
-5
-4.95
—
—
-4.95
V
VSS = -5V, “0” Level
Output Voltage
(Pins 14 to 23) (Note 3)
VOH
4.95
5
—
4.95
—
—
V
VSS = 0V, “1” Level
4.95
5
—
4.95
—
—
V
VSS = -5V, “1” Level
Output Current
(Pins 14 to 23)
IOH
-0.2
-0.36
—
-0.14
—
—
mA
VSS = 0V, VOH = 4.6V
Source
- 0.5
-0.9
—
-0.35
—
—
mA
VSS = -5V, VOH = 5V
Source
0.51
0.88
—
0.36
—
—
mA
VSS = 0V, VOL = 0.4V
Sink
1.3
2.25
—
0.9
—
—
mA
VSS = -5V,
VOL = -4.5V Sink
RC = 300 kΩ
Digital
Output Current
(Pins 14 to 23)
IOL
Clock Frequency
fCLK
—
66
—
—
—
—
kHz
Input Current -DU
IDU
—
±0.00
001
±0.3
—
—
±1
µA
Power
Quiescent Current:
TC14433A:
IQ
Quiescent Current:
TC14433
Supply Rejection
Note 1:
2:
3:
PSRR
—
—
—
—
—
—
—
VDD to VEE, ISS = 0
—
0.4
2
—
—
3.7
mA
VDD = 5, VEE = -5
—
1.4
4
—
—
7.4
mA
VDD = 8, VEE = -8
—
—
—
—
—
—
—
VDD to VEE, ISS = 0
—
0.9
2
—
—
3.7
mA
VDD = 5, VEE = -5
—
1.8
4
—
—
7.4
mA
VDD = 8, VEE = -8
—
0.5
—
—
—
—
mV/V
VDD to VEE, ISS = 0,
VREF = 2V,
VDD = 5, VEE = -5
Accuracy – The accuracy of the meter at full scale is the accuracy of the setting of the reference voltage. Zero is
recalculated during each conversion cycle. The meaningful specification is linearity. In other words, the deviation from
correct reading for all inputs other than positive full scale and zero is defined as the linearity specification.
The LSD stability for 200 mV scale is defined as the range that the LSD will occupy 95% of the time.
Pin numbers refer to 24-pin PDIP.
TEMPERATURE SPECIFICATIONS
Electrical Characteristics: Unless otherwise indicated, VDD = +5V and VEE = -5V.
Parameters
Sym
Min
Typ
Max
Units
Operating Temperature Range
TA
-40
—
+85
°C
Storage Temperature Range
TA
-65
—
+150
°C
Thermal Resistance, 24LD PDIP
θJA
—
60.5
—
°C/W
Thermal Resistance, 24LD CERDIP
θJA
—
N/A
—
°C/W
Thermal Resistance,24LD SOIC Wide
θJA
—
70
—
°C/W
Thermal Resistance, 28LD PLCC
θJA
—
61.2
—
°C/W
Conditions
Temperature Ranges
Note
Thermal Package Resistances
Note:
The internal junction temperature (TJ) must not exceed the absolute maximum specification of +150°C.
DS21394D-page 4
© 2008 Microchip Technology Inc.
TC14433/A
2.0
TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise specified, VDD = +5V, VEE = -5V, C1 = 0.1 µF, (Mylar), C0 = 0.1 µF, RC = 300 kΩ, R1 = 470 kΩ @ VREF = 2V,
R1 = 27 kΩ @ VREF = 200 mV, TA = +25°C.
Typical Quiescent Power Supply Current vs.Temp.
4
IQ - QUIESCENT CURRENT (mA)
ROLLOVER ERROR (IN LSD)
AT FULL SCALE
(PLUSE COUNT LESS MINUS COUNT)
Typical Rollover Error vs. Power Supply Skew
4
3
2
1
0
-1
-2
Note: Rollover Error is the Difference in Output
Reading for the same Analog Input Switched
from Positive to Negative.
-3
-4
-3
-2
0
-1
1
2
3
4
3
VEE = -8V
VDD = +8V
2
1
VEE = -5V
VDD = +5V
-40
0
-20
(VDD I-IVEE I) - SUPPLY VOLTAGE SKEW (V)
FIGURE 2-1:
Supply Skew
Rollover Error vs. Power
40
60
80
100
Typical P-Channel Sink Current at VDD – VSS = 5 Volts
5
-3
4
ID - SINK CURRENT (mA)
ID - SINK CURRENT (mA)
20
FIGURE 2-4:
Quiescent Power Supply
Current vs. Ambient Temperature.
Typical N-Channel Sink Current at VDD – VSS = 5 Volts
-40°C
3
+25°C
2
+85°C
1
0
0
1
2
3
4
5
-40°C
-2
+25°C
+85°C
-1
0
0
-1
VDS - DRAIN TO SOURCE VOLTAGE (VDC)
FIGURE 2-2:
Sink Current at VDD = 5V.
-2
-3
-4
-5
VDS - DRAIN TO SOURCE VOLTAGE (VDC)
FIGURE 2-5:
Typical Clock Frequency vs. Resistor (RC)
Sink Current at VDD = 5V.
Typical % Change fo Clock Frequency vs. Temp.
4
Note: ±5% Typical Variation over
Supply Voltage Range
of ±4.5V to ±8V
1M
100k
ICLK - CLOCK FREQUENCY
(% CHANGE)
ICLK - CLOCK FREQUENCY (Hz)
0
TA - TEMPERATURE (°C)
±5V Supply
3
2
1
0
±8V Supply
-1
-2
Normalized at 25°C
-3
-4
10k
10kΩ
100kΩ
1MΩ
RC - CLOCK FREQUENCY RESISTOR
-40
-20
0
20
40
60
80
TA - TEMPERATURE (°C)
CONVERSION RATE =
CLOCK FREQUENCY
±1.5%
16,400
CONVERSION RATE =
CLOCK FREQUENCY
±1.5%
16,400
MULTIPLEX RATE =
CLOCK FREQUENCY
80
MULTIPLEX RATE =
CLOCK FREQUENCY
80
FIGURE 2-3:
Resistor (RC)
Clock Frequency vs.
© 2008 Microchip Technology Inc.
FIGURE 2-6:
% Change to Clock
Frequency vs. Ambient Temperature.
DS21394D-page 5
TC14433/A
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
Pin No.
24-Pin PDIP,
SOIC
Pin No.
28-Pin
PLCC
Symbol
Description
1
2
VAG
This is the analog ground. It has a high input impedance. The pin determines
the reference level for the unknown input voltage (VX) and the reference
voltage (VREF).
2
3
VREF
Reference voltage – Full scale output is equal to the voltage applied to VREF.
Therefore, full scale voltage of 1.999V requires 2V reference and 199.9 mV
full scale requires a 200 mV reference. VREF functions as system reset also.
When switched to VEE, the system is reset to the beginning of the
conversion cycle.
3
4
VX
The unknown input voltage (VX) is measured as a ratio of the reference
voltage (VREF) in a ratiometric A/D conversion.
4
5
R1
This pin is for external components used for the integration function in the
dual slope conversion. Typical values are 0.1 µF (Mylar) capacitor for C1.
5
6
R1/C1
6
7
C1
7
9
CO1
These pins are used for connecting the offset correction capacitor. The
recommended value is 0.1 µF.
8
10
CO2
These pins are used for connecting the offset correction capacitor. The
recommended value is 0.1 µF.
9
11
DU
Display update input pin. When DU is connected to the EOC output, every
conversion is displayed. New data will be strobed into the output latches
during the conversion cycle if a positive edge is received on DU, prior to the
ramp down cycle. When this pin is driven from an external source, the
voltage should be referenced to VSS.
10
12
CLK1
Clock input pins. The TC14433 has its own oscillator system clock.
Connecting a single resistor between CLK1 and CLK0 sets the clock
frequency.
11
13
CLK0
A crystal or OC circuit may be inserted in lieu of a resistor for improved
CLK1, the clock input, can be driven from an external clock source, which
need only have standard CMOS output drive. This pin is referenced to VEE
for external clock inputs. A 300 kΩ resistor yields a clock frequency of about
66 kHz. See Section 2.0 “Typical Performance Curves”. (Also see
Figure 5-3 for alternate circuits.)
12
14
VEE
Negative power current. Connection pin for the most negative supply. Please
note the current for the output drive circuit is returned through VSS. Typical
supply current is 0.8 mA.
13
16
VSS
Negative power supply for output circuitry. This pin sets the low voltage level
for the output pins (BCD, Digit Selects, EOC, OR). When connected to
analog ground, the output voltage is from analog ground to VDD. If
connected to VEE, the output swing is from VEE to VDD. The recommended
operating range for VSS is between the VDD -3 volts and VEE.
14
17
EOC
End of conversion output generates a pulse at the end of each conversion
cycle. This generated pulse width is equal to one half the period of the
system clock.
15
18
OR
DS21394D-page 6
R1 = 470 kΩ (resistor) for 2V full scale.
R1 = 27 kΩ (resistor) for 200 mV full scale. Clock frequency of 66 kHz gives
250 ms conversion time.
Overrange pin. Normally this pin is set high. When VX exceeds VREF the OR
is low.
© 2008 Microchip Technology Inc.
TC14433/A
TABLE 3-1:
PIN FUNCTION TABLE (CONTINUED)
Pin No.
24-Pin PDIP,
SOIC
Pin No.
28-Pin
PLCC
Symbol
Description
16
19
DS4
Digit select pin. The digit select output goes high when the respective digit is
selected. The MSD (1/2 digit turns on immediately after an EOC pulse).
17
20
DS3
The remaining digits turn on in sequence from MSD to LSD.
18
21
DS2
To ensure that the BCD data has settled, an inter digit blanking time of two
clock periods is included.
19
23
DS1
Clock frequency divided by 80 equals multiplex rate. For example, a system
clock of 60 kHz gives a multiplex rate of 0.8 kHz.
20
24
Q0
See Figure 5-4 for digit select timing diagram.
21
25
Q1
BCD data output pin. Multiplexed BCD outputs contain three full digits of
information during digit select DS2, DS3, DS4.
22
26
Q2
During DS1, the 1/2 digit, overrange, underrange and polarity information is
available.
23
27
Q3
Refer to the Truth Table 5-1.
24
28
VDD
Positive power supply. This is the most positive power supply pin.
—
1
NC
Not Used.
—
8
NC
Not Used.
—
15
NC
Not Used.
—
22
NC
Not Used.
© 2008 Microchip Technology Inc.
DS21394D-page 7
TC14433/A
4.0
DETAILED DESCRIPTION
The TC14433 CMOS IC becomes a modified dualslope A/D with a minimum of external components.
This IC has the customary CMOS digital logic circuitry,
as well as CMOS analog circuitry. It provides the user
with digital functions such as (counters, latches,
multiplexers), and analog functions such as
(operational amplifiers and comparators) on a single
chip. Refer to the Functional Block diagram, Figure 4-3.
Features of the TC14433/A include auto-zero, high
input impedances and auto-polarity. Low power
consumption and a wide range of power supply
voltages are also advantages of this CMOS device.
The system’s auto-zero function compensates for the
offset voltage of the internal amplifiers and comparators. In this “ratiometric system,” the output reading is
the ratio of the unknown voltage to the reference
voltage, where a ratio of 1 is equal to the maximum
count of 1999. It takes approximately 16,000 clock
periods to complete one conversion cycle. Each
conversion cycle may be divided into 6 segments.
Figure 4-1 shows the conversion cycle in 6 segments
for both positive and negative inputs.
Segment 1 – The offset capacitor (CO), which compensates for the input offset voltages of the buffer and
integrator amplifiers, is charged during this period.
However, the integrator capacitor is shorted. This
segment requires 4000 clock periods.
Segment 2 – During this segment, the integrator output
decreases to the comparator threshold voltage. At this
time, a number of counts equivalent to the input offset
voltage of the comparator is stored in the offset latches
for later use in the auto-zero process. The time for this
segment is variable and less than 800 clock periods.
Segment 3 – This segment of the conversion cycle is
the same as Segment 1.
Segment 4 – Segment 4 is an up going ramp cycle with
the unknown input voltage (VX as the input to the
integrator.
Figure 4-2
shows
the
equivalent
configuration of the analog section of the TC14433.
The actual configuration of the analog section is
dependent upon the polarity of the input voltage during
the previous conversion cycle.
C1
Buffer
–
i
End
Start
Time
Segment
Number
1
2
3
4
DS21394D-page 8
6
+
Integrator
–
+
Comparator
+
–
VX
Typical
Positive
Input Voltage
VX
FIGURE 4-1:
Pin 6.
5
VX
R1
Typical
Negative
Input Voltage
Integrator Waveforms at
FIGURE 4-2:
Equivalent Circuit Diagrams
of the Analog Section During Segment 4 of the
Timing Cycle
Segment 5 – This segment is a down-going ramp
period with the reference voltage as the input to the
integrator. Segment 5 of the conversion cycle has a
time equal to the number of counts stored in the offset
storage latches during Segment 2. As a result, the
system zeros automatically.
Segment 6 – This is an extension of Segment 5. The
time period for this portion is 4000 clock periods. The
results of the A/D conversion cycle are determined in
this portion of the conversion cycle.
© 2008 Microchip Technology Inc.
TC14433/A
20-23
Multiplexer
RC
10
11
CLK 1 CLK 0
Clock
16 -19
Latches
1s'
Q – Q3
BDC Data
DS 1 – DS 4
Digit Strobe
Polarity Detect
10s'
100s'
1,000s'
TC14433/A
15
Overflow
CMOS
Analog Subsystem
Control Logic
Display
Update
FIGURE 4-3:
End of
9 14
Conversion
DU EOC
4
5
R 1 R 1 /C
7
8
6
C 1 CO 1 CO 2
Integrator
2
1
3
OR Overrange
V REF Reference Voltage
V AG Analog Ground
VX
Analog Input
V DD = Pin 24
V SS = Pin 13
V EE = Pin 12
Offset
Functional Block Diagram.
© 2008 Microchip Technology Inc.
DS21394D-page 9
TC14433/A
5.0
TYPICAL APPLICATIONS
The typical application circuit is an example of a 3-1/2
digit voltmeter using the TC14433 with Commonanode displays. This system requires a 2.5V reference.
Full scale may be adjusted to 1.999V or 199.9 mV.
Input overrange is indicated by flashing a display. This
display uses LEDs with common anode digit lines.
Power supply for this system is shown as a dual ±5V
supply; however, the TC14433 will operate over a wide
voltage range
The circuit in Figure 5-1 shows a 3-1/2 digit LCD
voltmeter. The 14024B provides the low frequency
square wave signal drive to the LCD backplane. Dual
power supplies are shown here; however, one supply
may be used when VSS is connected to VEE. In this
case, VAG must be at least 2.8V above VEE.
When only segments b and c of the decoder are connected to the 1/2 digit of the display, 4, 0, 7 and 3
appear as 1.
The overrange indication (Q3 = 0 and Q0 = 1) occurs
when the count is greater than 1999; (e.g., 1.999V for
a reference of 2V) The underrange indication, useful for
auto-ranging circuits, occurs when the count is less
than 180; (e.g., 0.180V for a reference of 2V).
Note:
If the most significant digit is connected to
a display other than a “1” only, such as a
full digit display, segments other than b
and c must be disconnected. The BCD to
7-segment decoder must blank on BCD
inputs 1010 to 1111 (see Table 5-1).
DS21394D-page 10
TABLE 5-1:
TRUTH TABLE
Coded
Q
Condition
3
of MSD
Q
Q
Q
2
1
0
+0
1
1
1
0
-0
1
0
1
0
+0 UR
1
1
1
1
-0 UR
1
0
1
1
+1
0
1
0
0
-1
0
0
0
0
+1 OR
0
1
1
1
-1 OR
0
0
1
1
Note 1:
BDC to 7-Segment
Decoding
Blank
Blank
Blank
Blank
4–1
0–1
7–1
3–1
Hook up
only segments
b and c to MSD
Q3 – 1/2 digit, low for “1”, high for “0”.
Q2 – Polarity: “1” = positive, “0” = negative.
Q0 – Out of range condition exists if Q0 = 1.
When used in conjunction with Q3, the type
of out of range condition is indicated; i.e.,
Q3 = 0 → OR or Q3 = 1 → UR.
Figure 5-2 is an example of a 3-1/2 digit LED voltmeter
with a minimum of external components, (only 11
additional components). In this circuit, the 14511B
provides the segment drive and the 75492 or 1413
provides sink for digit current. Display is blanked during
the overrange condition.
© 2008 Microchip Technology Inc.
TC14433/A
0.1 µF
V+
C01 C02
MCP1525
VX
TC14433
VOUT
1 µF
20
kΩ
VREF
VDD VSS VEE EOE DU
+V
-V
14013B
D
CR
Q
RQ
1/4
14013B
D
CR
C
14024B
R
DS4
DS3
DS2
DS1
Q0
Q1
Q2
Q3
RC
14070B 1/4
+V
300 kΩ
14070B
1/2 Digit
Plus
Sign
Q
RQ
-V
R1 R1/C1 C1
VAG
VIN
VSS
470 kΩ 0.1 µF
-V 1/4 14070B
Minus
Sign
+V
BI D C B A Ph LD
14543B
BI D C B A Ph LD
BI D C B A Ph LD
+V
g f e d c b a
-V
14543B
g f e d c b a
+V
-V
14543B
g f e d c b a
+V
-V
+V
FIGURE 5-1:
3-1/2 Digit Voltmeter with LCD Display.
© 2008 Microchip Technology Inc.
DS21394D-page 11
TC14433/A
470 kΩ 0.1 µF 0.1 µF
+5V
VX
Input
MCP1525
VIN
VOUT
VSS
20kΩ
R1 R1 /C C1 C01 C02
VX
CLK1
VAG
CLK0
DU
OR
Q0
EOE
Q1
TC14433
Q2
VREF
300 kΩ
VSS
1 µF
Resitor Network
or Individual
Resistor*
A
B1
B
C I4511B
D
LT
LE
VSS VDD
+5V
VDD
VEE
R
a
b
c
d
e
f
g
RDP
DS4 DS3 DS2 DS1
RM
Alternate Overrange Circuit
with Separated LED
OR
1/6 75492
OR
1/7
1413
VEE**
(Minus)
RR
+5V
+5V
Minus
Control
Common
Cathode
Led Display
75492
OR
1413*
Digit Drivers
Note 1: For VREF = 2000V; V: 1.999V full scale.
2: For VREF = 200 mV; V: 199.9 mV full scale (change 470 kΩ to R = 27 kΩ and decimal point position.
3: Peak digit current for an eight displayed is 7 times the segment current:
*To increase segment current capability, add two 75491 ICs between 14511B and resistor network.
The use of the 1413 as digit driver increases digit current capability over the 75492.
**V can range between -2.8V and -11V.
FIGURE 5-2:
Display.
3-1/2 Digit LED Voltmeter with Low Component Count Using Common Cathode
(A) Crystal Oscillator Circuit
10
C1
11
C2
10
CLK1
TC14433
18 MΩ
(B) LC Oscillator Circuit
L
FIGURE 5-3:
DS21394D-page 12
TC14433
11
CLK0
47 kΩ
C
10 pF < C1 and C2 < 200 pF
C
CLK1
CLK0
1
f = -----------------2π LC
For L = 5 mH and C = 0.01 µF @ 22.5 kHz
Alternate Oscillator Circuits.
© 2008 Microchip Technology Inc.
TC14433/A
EOC
1/2 Clock Cycle
ª 16,400 Clock Cycles
Between EOC Pulses
18 Clock Cycles
DS1
1/2 Digit
(MSD)
2 Clock Cycles
DS2
DS3
DS4
LCD
FIGURE 5-4:
Digit Select Timing Diagram.
© 2008 Microchip Technology Inc.
DS21394D-page 13
TC14433/A
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
24-Lead PDIP
Example:
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
XXXXXXXXXXXXXX
YYWWNNN
24-Lead SOIC (.300”)
Example:
XXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXX
YYWWNNN
28-Lead PLCC
Legend: XX...X
Y
YY
WW
NNN
e3
*
DS21394D-page 14
TC14433EOG^^
e3
0814256
Example:
XXXXXXXXXX
XXXXXXXXXX
YYWWNNN
Note:
TC14433EPG^^
e3
0814256
TC14433
e3
ELI^^
0814256
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
© 2008 Microchip Technology Inc.
TC14433/A
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DS21394D-page 15
TC14433/A
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DS21394D-page 16
© 2008 Microchip Technology Inc.
TC14433/A
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c
A
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© 2008 Microchip Technology Inc.
DS21394D-page 17
TC14433/A
6.2
Taping Form
Component Taping Orientation for 28-Lead PLCC Devices
Standard Reel Component Orientation
for 713 Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
24-Lead PLCC
DS21394D-page 18
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
24 mm
16 mm
750
330 mm
© 2008 Microchip Technology Inc.
TC14433/A
APPENDIX A:
REVISION HISTORY
Revision D (July 2008)
The following is the list of modifications:
1.
2.
3.
4.
5.
Changed Operating Temperature in Absolute
Maximum Ratings to -40°C to +85°C.
Added Packaging Marking information.
Added Package Outline Drawings.
Added Appendix A: “Revision History”
Added “Product Identification System”.
Revision C (January 2006)
• Undocumented changes
Revision B (May 2002)
• Undocumented changes
Revision A (March 2001)
• Original Release of this Document.
© 2008 Microchip Technology Inc.
DS21394D-page 19
TC14433/A
NOTES:
DS21394D-page 20
© 2008 Microchip Technology Inc.
TC14433/A
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
X
/XX
Device
Temperature
Range
Package
Device:
TC14433:
TC14433T:
TC14433A:
TC14433AT:
3 1/2 Digit, A/D Converter
3 1/2 Digit, A/D Converter
(Tape and Reel)
3 1/2 Digit, A/D Converter
3 1/2 Digit, A/D Converter
(Tape and Reel)
Temperature Range:
E
= -40°C to +85°C
Package:
LI = Plastic Leaded Chip Carrier, Square, 28-lead
PG = Plastic Dual In-Line, 600 mil Body, 24-lead
OG = Plastic Small Outline, Wide 7.50 mm, 24-lead
Examples:
a)
b)
TC14433ELI:
TC14433TELI:
c)
d)
TC14433EPG:
TC14433TEPG:
e)
f)
TC14433EOG:
TC14433TEOG:
a)
b)
TC14433AELI:
TC14433ATELI:
c)
d)
e)
f)
© 2008 Microchip Technology Inc.
24LD PLCC package.
Tape and Reel,
24LD PLCC package.
24LD PDIP package.
Tape and Reel,
24LD PDIP package.
24LD SOIC package.
Tape and Reel,
24-LD SOIC package.
28LD PLCC package.
Tape and Reel,
28LD PLCC package.
TC14433AEPG: 24LD PDIP package.
TC14433ATEPG: Tape and Reel,
24LD PDIP package.
TC14433AEOG: 24LD SOIC package.
TC14433ATEOG: Tape and Reel,
24-LD SOIC package.
DS21394D-page 21
TC14433/A
NOTES:
DS21394D-page 22
© 2008 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, PRO MATE, rfPIC and SmartShunt are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
FilterLab, Linear Active Thermistor, MXDEV, MXLAB,
SEEVAL, SmartSensor and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM,
PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2008, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
© 2008 Microchip Technology Inc.
DS21394D-page 23
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-4182-8400
Fax: 91-80-4182-8422
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
Kokomo
Kokomo, IN
Tel: 765-864-8360
Fax: 765-864-8387
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
01/02/08
DS21394D-page 24
© 2008 Microchip Technology Inc.