LTC1292(RevB) 데이터 시트보기 (PDF) - Linear Technology

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LTC1292
(Rev.:RevB)

Single Chip 12-Bit Data Acquisition Systems

Linear Technology 

APPLICATI

CS

S I FOR ATIO

LTC1292 Operating Sequence

tCYC

LTC1292/LTC1297

CLK

Hi-Z

DOUT

tSMPL

B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11

tCONV

tSMPL

LTC1297 Operating Sequence

LTC1292/7 AI01

CS

CLK

DOUT

tsuCS

tCYC

POWER SHUTDOWN MODE

Hi-Z

tSMPL

B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11

tCONV

LTC1292/7 AI02

Microprocessor Interfaces

The LTC1292/LTC1297 can interface directly (without

external hardware) to most popular microprocessors’

(MPU) synchronous serial formats (see Table 1). If an

MPU without a dedicated serial port is used, then three of

the MPU’s parallel port lines can be programmed to form

the serial link to the LTC1292/LTC1297. Included here are

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. A dummy DIN word sent to the

data register starts the SPI process. With two 8-bit transfers,

the A/D result is read into the MPU (Figure 1). For the

LTC1292 the first 8-bit transfer clocks B11 through B8 of

the A/D conversion result into the processor. The second

8-bit transfer clocks the remaining bits B7 through B0 into

CS

CLK

DOUT

MPU

RECEIVED WORD

B11 B10 B9 B8

BYTE 1

? ? ? O B11 B10 B9 B8

1ST TRANSFER

B7

B6 B5 B4 B3 B2 B1 B0 B1

BYTE 2

B7 B6 B5 B4 B3 B2 B1 B0

2ND TRANSFER

Figure 1. Data Exchange Between LTC1292 and MC68HC11

LTC1292/7 F01

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