LTC2410IGN datasheet(39/44 Pages) LINER

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LTC2410

TYPICAL APPLICATIO S

Sample Driver for LTC2410 SPI Interface

The LTC2410 has a very simple serial interface that makes

interfacing to microprocessors and microcontrollers very

easy.

The listing in Figure 55 is a simple assembler routine for

the 68HC11 microcontroller. It uses PORT D, configuring

it for SPI data transfer between the controller and the

LTC2410. Figure 54 shows the simple 3-wire SPI

connection.

The code begins by declaring variables and allocating four

memory locations to store the 32-bit conversion result.

This is followed by initializing PORT D’s SPI configuration.

The program then enters the main sequence. It activates

the LTC2410’s serial interface by setting the SS output

low, sending a logic low to CS. It next waits in a loop for

a logic low on the data line, signifying end-of-conversion.

After the loop is satisfied, four SPI transfers are com-

pleted, retrieving the conversion. The main sequence ends

by setting SS high. This places the LTC2410’s serial

interface in a high impedance state and initiates another

conversion.

Figure 54. Connecting the LTC2410 to a 68HC11 MCU Using the SPI Serial Interface

The performance of the LTC2410 can be verified using the

demonstration board DC291A, see Figure 56 for the

schematic. This circuit uses the computer’s serial port to

generate power and the SPI digital signals necessary for

starting a conversion and reading the result. It includes a

Labview application software program (see Figure 57)

which graphically captures the conversion results. It can

be used to determine noise performance, stability and

with an external source, linearity. As exemplified in the

schematic, the LTC2410 is extremely easy to use. This

demonstration board and associated software is available

by contacting Linear Technology.

LTC2410

SCK

SDO

SCK (PD4)

MISO (PD2)

SS (PD5)

68HC11

2410 F54

LTC2410IGN Datasheet(PDF) 39 Page - Linear Technology

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