TC520 MICROCHIP [Microchip Technology], TC520 Datasheet - Page 8

• Manufacturer Part Number: TC520
• Description: Serial Interface Adapter for TC500 A/D Converter Family
• Manufacturer: MICROCHIP [Microchip Technology]

TC520A
FIGURE 4-1:
FIGURE 4-2:
4.4.6
The 3 wire serial port of the TC520A can be opto-
isolated for applications requiring isolated data acquisi-
tion. The additional control lines (LOAD, DV, READ)
are normally not needed in such applications, but can
also be brought across the isolation barrier with the
addition of a second isolator.
DS21431B-page 8
DV
D
IN
D
, D
IN
LOAD
, D
CLK
DV
CE
CLK
CE
LOAD
OPTO-ISOLATED APPLICATIONS
LOAD VALUE updated
and conversion started
LOAD VALUE
shifted into
D IN
TC520 initialization & startup conversion timing relatioNships
lOad value modify cycle
AZ
AZ
INT
INT
DINT
DINT
IZ
IZ
LOAD VALUE
shift into
AZ
AZ
D
IN
TC520A Conversion State
TC520A Conversion State
INT
CE is pulled
high only during
AZ (DV = Low)
DINT
LOAD VALUE updated
and conversion started
INT
TC520A held in
AZ phase
as long as CE = HIGH
IZ
DINT
New LOAD VALUE
can be loaded
(if so desired)
AZ
©
IZ
2002 Microchip Technology Inc.
AZ
Value
Load
INT
AZ
INT