參數(shù)資料
型號(hào): LTC1417C
廠商: Linear Technology Corporation
元件分類(lèi): ADC
英文描述: Low Power 14-Bit, 400ksps Sampling ADC Converter with Serial I/O
中文描述: 低功耗14位,以其400 kSPS的串行I采樣ADC轉(zhuǎn)換器/輸出
文件頁(yè)數(shù): 25/32頁(yè)
文件大?。?/td> 394K
代理商: LTC1417C
25
LTC1417
*
*
*
GETDATAPSHX
(This assumes an E-Clock frequency of 4MHz. For higher
E-Clock frequencies, change the above value of $50 to a
value that ensures the SCK frequency is 2MHz or less.)
PSHY
PSHA
*
*****************************************
* Setup indecies
*****************************************
*
LDX
#$0
*
LDY
#$1000
*
*****************************************
* The next short loop ensures that the *
* LTC1417’s conversion is finished *
* before starting the SPI data transfer *
*****************************************
*
CONVENDLDAA
PORTC
ANDA
#%10000000
*
*
*
BPL
CONVEND
*
*
*************************************************************************
* This routine sends data to the LTC1417 and sets its MUX channel. The *
* very first time this routine is entered produces invalid data. Each *
* time thereafter, the data will correspond to the previous active
* CONVST signal sent to the LTC1417.
*************************************************************************
*
LDAA
#$00
Dummy value for upper byte of 16-bit SPI transfer
BCLR
PORTD,Y %00100000
This sets the SS* output bit to a logic
*
low, selecting the LTC1417
STAA
SPDR
Transfer Accum. A contents to SPI register to initiate
*
serial transfer
WAITMX1 LDAA
SPSR
Get SPI transfer status
BPL
WAITMX1If the transfer is not finished, read status
LDAA
SPDR
Load accumulator A with the current byte of LTC1417 data
*
that was just received
STAA
DIN1
Transfer the LTC1417’s high byte (Bit13 - Bit6) to memory
LDAA
MUX
Retrieve MUX address
ORAA
#$08
Set the MUX’s ENABLE bit
STAA
SPDR
Transfer Accum. A contents to SPI register to initiate
*
serial transfer
WAITMX2 LDAA
SPSR
Get SPI transfer status
BPL
WAITMX2If the transfer is not finished, read status
BSET
PORTD,Y %00100000
This sets the SS* output bit to a logic
*
high, de-selecting the LTC1417
LDAA
SPDR
Load accumulator A with the current byte of LTC1417 data
*
that was just received
STAA
DIN2
Transfer the LTC1417’s low byte (Bit5 - Bit0) to memory
LDD
DIN1
Load the contents of DIN1 and DIN2 into the double
*
accumulator D
LSRD
LSRD
Two logical shifts to the right to right justify the
*
14-bit conversion results
STD
DIN1
Place right justified result back in memory
*
The X register is used as a pointer to the memory
locations that hold the conversion data
Retrieve the contents of port D
Look at Bit7
Bit7 = Hi; the LTC1417’s conversion is complete
Bit7 = Lo; the LTC1417’s conversion is not
complete
Branch to the loop’s beginning while Bit7 remains
low
*
*
TYPICAL APPLICATIO
N
S
相關(guān)PDF資料
PDF描述
LTC1417I Low Power 14-Bit, 400ksps Sampling ADC Converter with Serial I/O
LTC1417CGN Low Power 14-Bit, 400ksps Sampling ADC Converter with Serial I/O
LTC1417IGN Low Power 14-Bit, 400ksps Sampling ADC Converter with Serial I/O
LTC1418ACG Low Power, 14-Bit, 200ksps ADC with Serial and Parallel I/O
LTC1418AIG Low Power, 14-Bit, 200ksps ADC with Serial and Parallel I/O
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