TC520A Datasheet, PDF (8/16 Pages) TelCom Semiconductor, Inc – SERIAL INTERFACE ADAPTER FOR TC500 A/D CONVERTER FAMILY

TC520A
FIGURE 4-1:
LOAD
CE
TC520 initialization & startup conversion timing relatioNships
AZ INT
DINT
TC520A Conversion State
IZ AZ INT
DINT
IZ
AZ
CE is pulled
high only during
AZ (DV = Low)
AZ
INT
D_IN, D_CLK
DV
LOAD VALUE updated
and conversion started
LOAD VALUE
shifted into
DIN
New LOAD VALUE
can be loaded
(if so desired)
Load
Value
FIGURE 4-2:
LOAD
TC520A held in
AZ phase
as long as CE = HIGH
lOad value modify cycle
AZ INT
DINT
IZ
TC520A Conversion State
AZ
INT
DINT
IZ
AZ
INT
CE
LOAD VALUE updated
and conversion started
D_IN, D_CLK
DV
LOAD VALUE
shift into
D_IN
4.4.6 OPTO-ISOLATED APPLICATIONS
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
© 2002 Microchip Technology Inc.