Datasheet

17
LTC1091/LTC1092
LTC1093/LTC1094
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
MICROWIRE is a trademark of National Semiconductor Corp.
Table 1. Microprocessors with Hardware Serial Interfaces
Compatible with the LTC1091/LTC1092/LTC1093/LTC1094
PART NUMBER TYPE OF INTERFACE
Motorola
MC6805S2, S3 SPI
MC68HC11 SPI
MC68HC05 SPI
RCA
CDP68HC05 SPI
Hitachi
HD6305 SCI Synchronous
HD63705 SCI Synchronous
HD6301 SCI Synchronous
HD63701 SCI Synchronous
HD6303 SCI Synchronous
HD64180 CSI/O
National Semiconductor
COP400 Family MICROWIRE
TM
COP800 Family MICROWIRE/PLUS
NS8050U MICROWIRE/PLUS
HPC16000 Family MICROWIRE/PLUS
Texas Instruments
TMS7002 Serial Port
TMS7042 Serial Port
TMS70C02 Serial Port
TMS70C42 Serial Port
TMS32011* Serial Port
TMS32020 Serial Port
*Requires external hardware
5. Microprocessor Interfaces
The LTC1091/LTC1092/LTC1093/LTC1094 can interface
directly (without external hardware) to most popular
microprocessor (MPU) synchronous serial formats (see
Table 1). If an MPU without a dedicated serial port is used,
then three or four of the MPU’s parallel port lines can be
programmed to form the serial link to the LTC1091/
LTC1092/LTC1093/LTC1094. Included here are one serial
interface example and one example showing a parallel port
programmed to form the serial interface.
1091/2/3/4 F02
CLK
START
MSBF B9 B8 • • •
PROCESSOR
MUST RELEASE
DATA LINE AFTER 4TH
RISING CLK AND BEFORE
THE 4TH FALLING CLK
MPU CONTROLS
DATA LINE AND SENDS
MUX ADDRESS TO LTC1091
LTC1091 TAKES CONTROL OF DATA LINE
ON 4TH FALLING CLK
SGL/
DIFF
ODD/
SIGN
CS
DATA (D
IN
/D
OUT
)
12
MSBF
LATCHED
BY LTC1091
34
LTC1091 CONTROLS
DATA LINE AND SENDS
A/D RESULT BACK TO MPU
Figure 2. LTC1091 Operation with D
IN
and D
OUT
Tied Together