參數(shù)資料
型號: LTC2400
廠商: Linear Technology Corporation
英文描述: 24-Bit uPower No Latency ADC in SO-8
中文描述: 24位uPower在ADC的無延遲蘇- 8
文件頁數(shù): 30/40頁
文件大?。?/td> 455K
代理商: LTC2400
30
LTC2400
TYPICAL APPLICATIO
N
S
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
'03/17/99
'
'
'
'
Sample Driver
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
ADhi
Ctr
Temp
var
var
var
var
word
word
byte
bit
'A/D result - lower 16 bits
'A/D result - upper 8 bits
'loop counter
'temporary bit used for shift
SDO
SCK
CS
Pwr
con
con
con
con
0
1
2
3
'Serial data connected to P0
'Serial clock connected to P1
'Chip Select connected to P2
'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
'Initialize outputs
'Pwr, CS, and SCK are low
'Wait 100mS for I/O to settle
'Power up the LTC2400
'Wait 1mS for power-on sequence
'Disable the device until we
'wish to read it.
'Eight times second
'Enable the LTC2400
outa = $0
pause 100
high Pwr
pause 1
high CS
Start
pause 125
low CS
for Ctr = 0 to 31
high SCK
gosub ShiftL
'Cycle clock 32 times
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,
www.parallaxinc.com.
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