參數資料
型號: LTC2400CS8
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 24-Bit uPower No Latency ADC in SO-8
中文描述: 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO8
封裝: 0.150 INCH, PLASTIC, SO-8
文件頁數: 31/40頁
文件大?。?/td> 455K
代理商: LTC2400CS8
31
LTC2400
Figure 32. This BASIC Stamp Code is an Example of How Easy it is to Retrieve Data from the LTC2400
ADlo.bit0 = in0
low SCK
next
high CS
ADhi = (ADhi<<4)+((ADlo&$F000)>>12)
debug ADhi
goto Start
'and sample data line
'Disable the LTC2400
'Discard the lower eight bits
'and display (debug command).
ShiftL
Temp = ADlo.bit15
ADlo = ADlo<<1
ADhi = ADhi<<1
ADhi.bit0 = Temp
return
'This routine simply
'performs a 1 bit
'left shift on two
'16 bit variables
TYPICAL APPLICATIO
N
S
Figure 33. Connecting the LTC2400 to a 68HC11 MCU Using the SPI Serial Interface
LTC2400
SCK
SDO
CS
7
6
5
SCK (PD4)
MISO (PD2)
SS (PD5)
68HC11
2400 F33
The listing in Figure 34 is a simple assembler routine for
the 68HC11 microcontroller. It uses PORT D, configuring
it for SPI data transfer between the controller and the
LTC2400. Figure 33 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 LTC2400’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 LTC2400’s serial
interface in a high impedance state and initiates another
conversion.
*****************************************************
* This example program transfers the LTC2400's 32-bit output *
* conversion result into four consecutive 8-bit memory locations. *
*****************************************************
*68HC11 register definition
PORTD
EQU
$1008
Port D data register
*
" – , – , SS* ,CSK ;MOSI,MISO,TxD ,RxD"
DDRD
EQU
$1009
Port D data direction register
SPSR
EQU
$1028
SPI control register
*
"SPIE,SPE ,DWOM,MSTR;SPOL,CPHA,SPR1,SPR0"
SPSR
EQU
$1029
SPI status register
*
"SPIF,WCOL, – ,MODF; – , – , – , – "
SPDR
EQU
$102A
SPI data register; Read-Buffer; Write-Shifter
*
* RAM variables to hold the LTC2400's 32 conversion result
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