TC14433/A

TC14433/A
3-1/2 Digit, Analog-to-Digital Converter
Features:
•
•
•
•
•
•
•
•
•
•
Package Type
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
24-Pin PDIP (Wide)
24-Pin CERDIP (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
TC14433/A
C1 6
19 DS1
Applications:
CO1
7
18 DS2
•
•
•
•
•
•
•
CO2 8
17 DS3
9
16 DS4
Portable Instruments
Digital Voltmeters
Digital Panel Meters
Digital Scales
Digital Thermometers
Remote A/D Sensing Systems
MPU Systems
DU
CLK1 10
15 OR
CLK0
11
14 EOC
VEE 12
13 VSS
28-Pin PLCC
TC14433AEPG
24-Pin PDIP
(Wide)
24-Pin SOIC
(Wide)
0°C to +70°C
24-Pin CERDIP
(Wide)
-40°C to +85°C
TC14433ELI
28-Pin PLCC
-40°C to +85°C
TC14433EPG
24-Pin PDIP
(Wide)
-40°C to +85°C
28 27 26
R1 5
25 Q1
-40°C to +85°C
R1/C1 6
24 Q0
-40°C to +85°C
C1 7
23 DS1
TC14433/A
NC 8
22 NC
CO1 9
21 DS2
CO2 10
20 DS
DU 11
19 DS4
3
2:
OR
EOC
NC
VSS
VEE
12 13 14 15 16 17 18
Note 1:
© 2006 Microchip Technology Inc.
1
CLK0
TC14433EJG
2
CLK1
TC14433COG
3
Q2
TC14433AELI
4
Q3
-40°C to +85°C
NC
24-Pin CERDIP
(Wide)
VAG
TC14433AEJG
VREF
Package
VX
Temperature
Range
Part Number
VDD
28-Pin PLCC
Device Selection Table
NC = No internal connection (In 28-Pin
PLCC).
24-Pin SOIC (Wide) package, only for
TC14433 device.
DS21394C-page 1
TC14433/A
General Description
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.
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.
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.
The TC14433/A is available in 24-Pin PDIP, 24-Pin
CERDIP, 24-Pin SOIC (TC14433 device only), and
28-Pin PLCC packages.
Typical Application
MCP1525
+5V
20k
VOUT
VIN
1 μF
VSS
1 μF
-5V
+5V
0.1
300k
RC
VX
11 10 2 12 24
23
22
21
20
4
5 TC14433
13
6
1
3
1
R 1*
0.1 μF**
0.1 μF**
7
8
-5V
-5V
14013B
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
2
3 D
C RQ
4
8
9 D S Q 13
11 C Q 12
R
710 14
-5V
+5V
16
4
2
3
5
*R1 = 470 kΩ for 2V Range
R1 = 27 kΩ for 200 mV Range
**Mylar Capacitor
DS21394C-page 2
+5V
0.1 μF
+5V
Minus Sign
f g e d c b a
200Ω
MPS-A12 Plus Sign
-5V
110Ω
51k
Common
Anode Led
+5V
Display
50 μF
0.1 μF
MPS-A12
(4)
-5V
© 2006 Microchip Technology Inc.
TC14433/A
1.0
ELECTRICAL
CHARACTERISTICS
*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.................................................. 940W
SOIC ............................................................. 940W
CERDIP ....................................................... 1.45W
Operating Temperature Range ............... 0°C to +70°C
Storage Temperature Range.............. -65°C to +160°C
TABLE 1-1:
TC14433/A ELECTRICAL SPECIFICATIONS
Electrical Characteristics: 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, unless otherwise specified.
Parameter
Min
Typ
Max
Min
Typ
Max
SYE
Rollover Error (Positive) and
Negative Full Scale
Symmetry
-1
—
+1
—
—
—
Count 200 mV Full Scale
s
VIN -VIN = +VIN
NL
Linearity Output Reading
(Note 1)
-0.05
+0.05
+0.05
—
—
—
%rdg VREF = 2V
-1 count
—
+1 count
—
—
—
%rdg VREF = 200 mV
SOR
Stability Output Reading
(Note 2)
—
—
2
—
—
—
LSD
VX = 1.99V,
VREF = 2V
—
—
3
—
—
—
LSD
VX = 199 mV,
VREF = 200 mV
VX = 0V, VREF = 2V
Symbol
Units
Test Conditions
Analog Input
ZOR
Zero Output Reading
—
0
0
—
—
—
LSD
IIN
Bias Current: Analog Input
Reference Input
Analog Ground
—
±20
±100
—
—
—
pA
—
±20
±100
—
—
—
pA
—
±20
±100
—
—
—
pA
—
65
—
—
—
—
dB
CMRR
Common mode Rejection
Note 1:
2:
3:
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.
© 2006 Microchip Technology Inc.
DS21394C-page 3
TC14433/A
TABLE 1-1:
TC14433/A ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: 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, unless otherwise specified.
Symbol
Parameter
Min
Typ
Max
Min
Typ
Max
Units
Test Conditions
—
0
0.05
—
—
0.05
V
VSS = 0V, “0” Level
—
-5
-4.95
—
—
-4.95
V
VSS = -5V, “0” Level
4.95
5
—
4.95
—
—
V
VSS = 0V, “1” Level
4.95
5
—
4.95
—
—
V
VSS = -5V, “1” Level
-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
VOL
Output Voltage
(Pins 14 to 23) (Note 3)
Output Voltage
(Pins 14 to 23) (Note 3)
VOH
Output Current
(Pins 14 to 23)
IOH
Output Current
(Pins 14 to 23)
IOL
fCLK
Clock Frequency
—
66
—
—
—
—
kHz
IDU
Input Current -DU
—
±0.00
001
±0.3
—
—
±1
μA
Power
IQ
Quiescent Current: 14433A:
Quiescent Current: 14433:
PSRR
Supply Rejection
Note 1:
2:
3:
—
—
—
—
—
—
—
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.
DS21394C-page 4
© 2006 Microchip Technology Inc.
TC14433/A
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
Pin No.
(24-Pin PDIP)
(28-Pin
(24-Pin CERDIP)
PLCC)
(24-Pin SOIC)
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 3.0 “Typical Characteristics”. (Also see Figure 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.
© 2006 Microchip Technology Inc.
R1 = 470 kΩ (resistor) for 2V full scale.
R1 = 27 kΩ (resistor) for 200 mV full scale. Clock frequency of 66 kHz gives
250 msec conversion time.
DS21394C-page 5
TC14433/A
TABLE 2-1:
PIN FUNCTION TABLE (CONTINUED)
Pin No.
Pin No.
(24-Pin PDIP)
(28-Pin
(24-Pin CERDIP)
PLCC)
(24-Pin SOIC)
Symbol
Description
15
18
OR
Overrange pin. Normally this pin is set high. When VX exceeds VREF the OR
is low.
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 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.
DS21394C-page 6
© 2006 Microchip Technology Inc.
TC14433/A
3.0
TYPICAL CHARACTERISTICS
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.
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
-1
0
2
1
3
3
VEE = -8V
VDD = +8V
2
1
VEE = -5V
VDD = +5V
-40
0
4
-20
0
20
40
60
80
100
TA - TEMPERATURE (°C)
(VDD I-IVEE I) - SUPPLY VOLTAGE SKEW (V)
Typical P-Channel Sink Current at VDD – VSS = 5 Volts
Typical N-Channel Sink Current at VDD – VSS = 5 Volts
5
ID - SINK CURRENT (mA)
ID - SINK CURRENT (mA)
-3
4
-40°C
3
+25°C
2
+85°C
1
-40°C
-2
+25°C
+85°C
-1
0
0
0
1
2
3
4
0
5
Typical Clock Frequency vs. Resistor (RC)
-2
-3
-4
-5
Typical % Change fo Clock Frequency vs. Temp.
4
Note: ±5% Typical Variation over
Supply Voltage Range
of ±4.5V to ±8V
1M
100k
10k
10kΩ
100kΩ
1MΩ
RC - CLOCK FREQUENCY RESISTOR
ICLK - CLOCK FREQUENCY
(% CHANGE)
ICLK - CLOCK FREQUENCY (Hz)
-1
VDS - DRAIN TO SOURCE VOLTAGE (VDC)
VDS - DRAIN TO SOURCE VOLTAGE (VDC)
±5V Supply
3
2
1
0
±8V Supply
-1
-2
Normalized at 25°C
-3
-4
-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
© 2006 Microchip Technology Inc.
DS21394C-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 .
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 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.
Buffer
–
i
Start
Time
1
Segment
Number
End
2
3
4
DS21394C-page 8
+
R1
Integrator
–
+
Comparator
+
–
6
VX
Typical
Positive
Input Voltage
VX
FIGURE 4-1:
5
VX
C1
Typical
Negative
Input Voltage
Integrator Waveforms at Pin 6
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.
© 2006 Microchip Technology Inc.
TC14433/A
20-23
Multiplexer
RC
10
11
CLK1 CLK0
Clock
Latches
1's
10's
Q – Q3
BDC Data
DS1 – DS4
Digit Strobe
16 -19
Polarity Detect
100's
1,000's
TC14433/A
15
Overflow
Control Logic
Display
Update
FIGURE 4-3:
End of
9 14 Conversion
DU EOC
CMOS
Analog Subsystem
4
5
R1 R1/C
6
7
8
C1 CO1 CO2
Integrator
2
1
3
OR Overrange
VREF Reference Voltage
VAG Analog Ground
Analog Input
VX
VDD = Pin 24
VSS = Pin 13
VEE = Pin 12
Offset
Functional Block Diagram
© 2006 Microchip Technology Inc.
DS21394C-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 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.
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).
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
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.
-0 UR
1
0
1
1
+1
0
1
0
0
-1
0
0
0
0
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).
+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 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.
DS21394C-page 10
© 2006 Microchip Technology Inc.
TC14433/A
0.1 μF
V+
MCP1525
VIN
VOUT
VSS
20k
1 μF
470k
0.1 μF
-V
R1/C 1C1
DS4
DS3
VAG
DS2
DS1
TC14433
Q0
Q1
VREF
Q2
Q3
VDD VSS VEE EOE DU RC RC
C01 C02 R1
VX
+V
-V
C
R 14024B
14070B 1/4
+V
300k
14013B
14070B
1/4
1/2 Digit
D
Q
C R RQ
14013B
D
Q
C R RQ
Plus
Sign
-V 1/4 14070B
Minus
Sign
+V
FIGURE 5-1:
BI D C B A Ph LD
14543B
g f e d c b a
BI D C B A Ph LD
+V
14543B
-V
g f e d c b a
+V
BI D C B A Ph LD
+V
-V
14543B
g f e d c b a
+V
-V
3-1/2 Digit Voltmeter with LCD Display
© 2006 Microchip Technology Inc.
DS21394C-page 11
TC14433/A
470k 0.1 μF 0.1 μF
VX
+5V
Input
MCP1525
VIN
VOUT
VSS
20k
R1 R1/C C1 C01 C02
VX
CLK1
VAG
CLK0
DU
OR
Q0
EOE
Q1
TC14433
Q2
VREF
1 μF
300k
VSS
A B1 a
B
b
C I4511B c
d
D
e
LT
f
LE
VSS VDD g
+5V
VDD
VEE
DS4 DS3 DS2 DS1
OR
RDP
RM
Alternate Overrange Circuit
with Separated LED
1/6 75492
OR
1/7 1413
Resitor Network
or Individual
Resistor*
R
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 470k to R = 27k 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:
3-1/2 Digit LED Voltmeter with Low Component Count Using Common Cathode
Display
(A) Crystal Oscillator Circuit
10
C1
11
C2
10
CLK1
TC14433
18M
(B) LC Oscillator Circuit
C
10 pF < C1 and C2 < 200 pF
DS21394C-page 12
TC14433
11
CLK0
47k
FIGURE 5-3:
C
L
f=
1
2π
CLK1
CLK0
2/LC
For L = 5 mH and C = 0.01 μF, f ≅ 32 kHz
Alternate Oscillator Circuits
© 2006 Microchip Technology Inc.
TC14433/A
EOC
1/2 Clock Cycle
≈ 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
© 2006 Microchip Technology Inc.
DS21394C-page 13
TC14433/A
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
Package marking data not available at this time.
6.2
Taping Form
Component Taping Orientation for 24-Pin SOIC (Wide) Devices
User Direction of Feed
Pin 1
W
P
Standard Reel Component Orientation
for 713 Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
24-Pin SOIC (W)
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
24 mm
12 mm
1000
13 in
Component Taping Orientation for 28-Pin PLCC Devices
User Direction of Feed
Pin 1
W
P
Standard Reel Component Orientation
for 713 Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
28-Pin PLCC
DS21394C-page 14
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
24 mm
16 mm
750
13 in
© 2006 Microchip Technology Inc.
TC14433/A
6.3
Package Dimensions
24-Pin PDIP (Wide)
Pin 1
.555 (14.10)
.530 (13.46)
1.270 (32.26)
1.240 (31.50)
.610 (15.49)
.590 (14.99)
.200 (5.08)
.140 (3.56)
.040 (1.02)
.020 (0.51)
.150 (3.81)
.115 (2.92)
.015 (0.38)
.008 (0.20)
3°Min.
.700 (17.78)
.610 (15.50)
.070 (1.78)
.045 (1.14)
.110 (2.79)
.090 (2.29)
.022 (0.56)
.015 (0.38)
Dimensions: inches (mm)
24-Pin CERDIP (Wide)
Pin 1
.540 (13.72)
.510 (12.95)
.030 (0.76) Min.
.098 (2.49) Max.
1.270 (32.26)
1.240 (31.50)
.620 (15.75)
.590 (15.00)
.060 (1.52)
.020 (0.51)
.210 (5.33)
.170 (4.32)
.200 (5.08)
.125 (3.18)
.150 (3.81)
Min.
.110 (2.79)
.090 (2.29)
.065 (1.65)
.045 (1.14)
.020 (0.51)
.016 (0.41)
.015 (0.38)
.008 (0.20)
3° Min.
.700 (17.78)
.620 (15.75)
Dimensions: inches (mm)
© 2006 Microchip Technology Inc.
DS21394C-page 15
TC14433/A
Package Dimensions (Continued)
24-Pin SOIC (Wide)
Pin 1
.299 (7.59) .419 (10.65)
.291 (7.40) .398 (10.10)
.615 (15.62)
.597 (15.16)
.104 (2.64)
.097 (2.46)
.050 (1.27) Typ.
.019 (0.48)
.014 (0.36)
.012 (0.30)
.004 (0.10)
8°
Max.
.013 (0.33)
.009 (0.23)
.050 (1.27)
.016 (0.40)
Dimensions: inches (mm)
28-Pin PLCC
Pin 1
.021 (0.53)
.013 (0.33)
.050 (1.27) Typ.
.495 (12.58)
.485 (12.32)
.456 (11.58)
.450 (11.43)
.032 (0.81)
.026 (0.66)
.456 (11.58)
.450 (11.43)
.495 (12.58)
.485 (12.32)
.430 (10.92)
.390 (9.91)
.020 (0.51) Min.
.120 (3.05)
.090 (2.29)
.180 (4.57)
.165 (4.19)
Dimensions: inches (mm)
DS21394C-page 16
© 2006 Microchip Technology Inc.
TC14433/A
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
2.
3.
Your local Microchip sales office
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
© 2006 Microchip Technology Inc.
DS21394C-page 17
TC14433/A
NOTES:
DS21394C-page 18
© 2006 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’s products as critical components in
life support systems is not authorized except with express
written approval by Microchip. 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, microID, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB,
PICMASTER, 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, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Linear Active Thermistor,
MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM,
PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo,
PowerMate, PowerTool, Real ICE, rfLAB, rfPICDEM, Select
Mode, Smart Serial, SmartTel, 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.
© 2006, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro® 8-bit MCUs, 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.
© 2006 Microchip Technology Inc.
DS21394C-page 19
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
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
India - Bangalore
Tel: 91-80-2229-0061
Fax: 91-80-2229-0062
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
India - New Delhi
Tel: 91-11-5160-8631
Fax: 91-11-5160-8632
Austria - Wels
Tel: 43-7242-2244-399
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
China - Chengdu
Tel: 86-28-8676-6200
Fax: 86-28-8676-6599
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
China - Fuzhou
Tel: 86-591-8750-3506
Fax: 86-591-8750-3521
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
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Korea - Gumi
Tel: 82-54-473-4301
Fax: 82-54-473-4302
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
Atlanta
Alpharetta, GA
Tel: 770-640-0034
Fax: 770-640-0307
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Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
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Tel: 630-285-0071
Fax: 630-285-0075
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Tel: 972-818-7423
Fax: 972-818-2924
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Tel: 248-538-2250
Fax: 248-538-2260
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Tel: 765-864-8360
Fax: 765-864-8387
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Tel: 949-462-9523
Fax: 949-462-9608
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Mountain View, CA
Tel: 650-215-1444
Fax: 650-961-0286
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Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
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Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
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Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
China - Xian
Tel: 86-29-8833-7250
Fax: 86-29-8833-7256
Malaysia - Penang
Tel: 60-4-646-8870
Fax: 60-4-646-5086
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
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
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
10/31/05
DS21394C-page 20
© 2006 Microchip Technology Inc.