LTC2400CS8 datasheet(30/40 Pages) LINER

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LTC2400

TYPICAL APPLICATIONS

Sample Driver for LTC2400 SPI Interface

The LTC2400 has a very simple serial interface that makes

interfacing to microprocessors and microcontrollers very

easy. Shown in Figures 32 and 34 are listings of sample

source codes that can be used to initiate conversions and

retrieve data from the LTC2400.

The listing in Figure 32 was created by Parallax, Inc. (916-

624-8333), for the BASIC Stamp. This code uses indi-

vidual port lines to control the LTC2400’s conversion and

'LTC2400

Sample Driver

'03/17/99

This program is an example showing how to access the

LTC2400 using the Basic Stamp2 from Parallax. Since

the BS2 is based on a 16-bit architecture, only the

upper 16 bits of the 24-bit result are displayed,

although all 24 bits are retrieved.

ADlo

var

word

'A/D result - lower 16 bits

ADhi

var

word

'A/D result - upper 8 bits

Ctr

var

byte

'loop counter

Temp

var

bit

'temporary bit used for shift

SDO

con

'Serial data connected to P0

SCK

con

'Serial clock connected to P1

con

'Chip Select connected to P2

Pwr

con

'Stamp supplies power connected to P3

'(Uses only 0.3mA!)

Init

dira = $E

'Set up data direction

'Pwr, CS, and SCK are outputs

'SDO is an input

outa = $0

'Initialize outputs

'Pwr, CS, and SCK are low

pause 100

'Wait 100mS for I/O to settle

high Pwr

'Power up the LTC2400

pause 1

'Wait 1mS for power-on sequence

high CS

'Disable the device until we

Start

'wish to read it.

pause 125

'Eight times second

low CS

'Enable the LTC2400

for Ctr = 0 to 31

high SCK

'Cycle clock 32 times

gosub ShiftL

retrieve the 32-bit result. A fourth port line is used to

power the LTC2400, a vivid example of the converter’s

micropower operation. The program’s main sequence

activates the LTC2400’s serial interface, uses a loop to

retrieve the 32 conversion bits, and then places the

converter’s interface in a high impedance state and start-

ing the next conversion. All bits are retained in variables

ADlo and ADhi. The code can be found on their web site,

LTC2400CS8 数据表(PDF) 30 Page - Linear Technology

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