mc145028 Freescale Semiconductor, Inc, mc145028 Datasheet - Page 11

• Manufacturer Part Number: mc145028
• Description: Mc145027 Encoder And Decoder Pair
• Manufacturer: Freescale Semiconductor, Inc

R
Resistor 1, Capacitor 1 (Pins 6, 7)
As shown in
whether a narrow pulse or wide pulse has been received. The time constant R
1.72 encoder clock periods:
R
Resistor 2/Capacitor 2 (Pin 10)
As shown in
end of a received word and the end of a transmission. The time constant R
clock periods (four data periods per
determine whether the D
on-chip comparator looks at the voltage-equivalent two data periods (0.4 R
between received words within a transmission.
VT
Valid Transmission Output (Pin 11)
This valid transmission output goes high after the second word of an encoding sequence when the
following conditions are satisfied:
VT remains high until either a mismatch is received or no input signal is received for four data periods.
V
Negative Power Supply (Pin 8)
The most-negative supply potential. This pin is usually ground.
V
Positive Power Supply (Pin 16)
The most-positive power supply pin.
Freescale Semiconductor
SS
DD
1
2
, C
/C
1. the received addresses of both words match the local decoder address, and
2. the received data bits of both words match.
2
1
Figure 3
Figure 3
R
1
C
1
= 3.95 R
and
and
in
Figure
Figure
pin has remained low for four data periods (end of transmission). A separate
MC145026, MC145027, MC145028 Technical Data, Rev. 4
TC
C
4, this pin accepts a resistor and capacitor that are used to detect both the
4, these pins accept a resistor and capacitor that are used to determine
TC
Figure
12): R
2
C
2
= 77 R
TC
C
TC
. This time constant is used to
2
2
x C
C
1
2
× C
2
) to detect the dead time
should be 33.5 encoder
1
should be set to
Pin Descriptions
11