LTC1090CN データシートの表示（PDF） - Linear Technology

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LTC1090CN

Single Chip 10-Bit Data Acquisition System

Linear Technology 

LTC1090

APPLICATIO S I FOR ATIO

Motorola SPI (MC68HC05C4)

The MC68HC05C4 transfers data MSB first and in 8-bit

increments. Programming the LTC1090 for MSB first

format and 16-bit word length allows the 10-bit data

output to be received by the MPU as two 8-bit bytes with

the final 6 unused bits filled with zeroes by the LTC1090.

Hardware and Software Interface to Motorola MC68HC05C4

Processor

ANALOG

INPUTS

LTC1090

CS

SCLK

DIN

DOUT

MC68HCO5C4

CO

SCK

MOSI

MISO

DOUT from LTC1090 stored in MC68HCO5C4 RAM

MSB*

Location A

B9 B8 B7 B6 B5 B4 B3 B2

LSB

Location A + 1 B1 B0 0 0 0 0 0 0

byte 1

byte 2

*B9 is MSB in unipolar or sign bit in bipolar

LTC1090 • AI12

MNEMONIC

DESCRIPTION

BCLR n

LDA

STA

↑

NOP

↓

LDA

LDA

STA

STA

↑

NOP

↓

BSET n

LDA

LDA

STA

C0 is cleared (CS goes Low)

Load DIN for LTC1090 into ACC

Load DIN from ACC to SPI data reg. Start SCK

8 NOPs for timing

Load contents of SPI status reg. into ACC

Load LTC1090 DOUT from SPI data reg. into ACC (byte 1)

Load LTC1090 DOUT into RAM (location A)

Start next SPl cycle

6 NOPs for timing

C0 is set (CS goes high)

Load contents of SPI status reg. into ACC

Load LTC1090 DOUT from SPI data reg. into ACC (byte 2)

Load LTC1090 DOUT into RAM (location A + 1)

16

Hitachi Synchronous SCI (HD63705)

The HD63705 transfers serial data in 8-bit increments,

LSB first. To accommodate this, the LTC1090 is

programmed for 16-bit word length and LSB first format.

The 10-bit output data is received by the processor as two

8-bit bytes, LSB first. The LTC1090 fills the final 6 unused

bits (after the MSB) with zeroes in unipolar mode and with

the sign bit in bipolar mode.

Hardware and Software Interface to Hitachi HD63705 Processor

ANALOG

INPUTS

LTC1090

CS

SCLK

DIN

DOUT

HD63705

C0

CK

TX

RX

DOUT from LTC1090 stored in HD63705 RAM

LSB

Location A

B7 B6 B5 B4 B3 B2 B1 B0 byte 1

Sign

Location A + 1 B9 B9 B9 B9 B9 B9 B9 B8 byte 2

Location A

Location A + 1

Bipolar

LSB

B7 B6 B5 B4 B3 B2 B1 B0 byte 1

MSB

0 0 0 0 0 0 B9 B8

byte 2

Unipolar

LTC1090 • AI13

MNEMONIC

DESCRIPTION

LDA

BCLR n

STA

↑

NOP

↓

LDA

STA

NOP

BSET n

LDA

STA

Load DIN word for LTC1090 into ACC from RAM

C0 cleared (CS goes low)

Load DIN word for LTC1090 into SCI data reg. from ACC

and start clocking data (LSB first)

6 NOPs for timing

Load contents of SCI data reg. into ACC (byte 1)

Start next SCI cycle

Load LTC1090 DOUT word into RAM (Location A)

Timing

C0 set (CS goes high)

Load contents of SCI data reg. into ACC (byte 2)

Load LTC1090 DOUT word into RAM (Location A + 1)

1090fc

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