TC14433_08 Datasheet, PDF (7/24 Pages) Microchip Technology – 3-1/2 Digit, Analog-to-Digital Converter

TC14433/A
TABLE 3-1: PIN FUNCTION TABLE (CONTINUED)
Pin No.
24-Pin PDIP,
SOIC
Pin No.
28-Pin Symbol
PLCC
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
V_DD 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