LTC1288 Ver la hoja de datos (PDF) - Linear Technology
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LTC1288 Datasheet PDF : 24 Pages
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LTC1285/LTC1288
TYPICAL APPLICATIONS N
MICROPROCESSOR INTERFACES
The LTC1285/LTC1288 can interface directly without ex-
ternal hardware to most popular microprocessor (MPU)
synchronous serial formats (see Table 1). If an MPU
without a dedicated serial port is used, then 3 or 4 of the
MPU's parallel port lines can be programmed to form the
serial link to the LTC1285/LTC1288. Included here is one
serial interface example and one example showing a
parallel port programmed to form the serial interface.
Motorola SPI (MC68HC11)
The MC68HC11 has been chosen as an example of an MPU
with a dedicated serial port. This MPU transfers data MSB
-first and in 8-bit increments. The DIN word sent to the data
register starts with the SPI process. With three 8-bit
transfers, the A/D result is read into the MPU. The second
8-bit transfer clocks B11 through B8 of the A/D conversion
result into the processor. The third 8-bit transfer clocks
the remaining bits, B7 through B0, into the MPU. The data
is right justified into two memory locations. ANDing the
second byte with OFHEX clears the four most significant
bits. This operation was not included in the code. It can be
inserted in the data gathering loop or outside the loop
when the data is processed.
MC68HC11 Code
In this example the DIN word configures the input MUX for
a single-ended input to be applied to CHO. The conversion
result is output MSB-first.
Table 1. Microprocessor with Hardware Serial Interfaces
Compatible with the LTC1286/LTC1298
PART NUMBER
TYPE OF INTERFACE
Motorola
MC6805S2,S3
SPI
MC68HC11
SPI
MC68HC05
SPI
RCA
CDP68HC05
SPI
Hitachi
HD6305
HD63705
HD6301
HD63701
HD6303
HD64180
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
SCI Synchronous
CSI/O
National Semiconductor
COP400 Family
COP800 Family
NS8050U
HPC16000 Family
MICROWIRE†
MICROWIRE/PLUS†
MICROWIRE/PLUS†
MICROWIRE/PLUS†
Texas Instruments
TMS7002
TMS7042
TMS70C02
TMS70C42
TMS32011*
TMS32020
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
Serial Port
Intel
8051
Bit Manipulation on Parallel Port
* Requires external hardware
† MICROWIRE and MICROWIRE/PLUS are trademarks of
National Semiconductor Corp.
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