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TC14433EJG Datasheet(PDF) 5 Page - Microchip Technology

Part # TC14433EJG
Description  3-1/2 Digit, Analog-to-Digital Converter
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC14433EJG Datasheet(HTML) 5 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21394B-page 5
TC14433/A
2.0
PIN DESCRIPTIONS
Thedescriptionsof the pins arelistedinTable2.0.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(24-Pin PDIP)
(24-Pin CERDIP)
(24-Pin SOIC)
Pin No.
(28-Pin PLCC)
Symbol
Description
12
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).
23
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 199.9mV full scale
requires a 200mV reference. VREF functions as system reset also. When switched
to VEE, the system is reset to the beginning of the conversion cycle.
34
VX
The unknown input voltage (VX) is measured as a ratio of the reference voltage
(VREF) in a rationetric A/D conversion.
45
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.
56
R1/C1
R1 =470kΩ (resistor) for 2V full scale.
67
C1
R1 =27kΩ (resistor) for 200mV full scale. Clock frequency of 66kHz gives 250msec
conversion time.
79
CO1
These pins are used for connecting the offset correction capacitor.
The recommended value is 0.1
µF.
810
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.
A300k
Ω resistor yields a clock frequency of about 66kHz. See Section 5.0 Typical
Characteristics. (Also see Figure 4-3 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 0.8mA.
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
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
60kHz gives a multiplex rate of 0.8kHz.
20
24
Q0
See Figure 4-4 for digit select timing diagram.


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