参数资料
型号: DC575A
厂商: Linear Technology
文件页数: 40/48页
文件大小: 0K
描述: BOARD DELTA SIGMA ADC LTC2410
软件下载: QuikEval System
设计资源: DC575A Design File
DC575A Schematic
标准包装: 1
系列: QuikEval™
ADC 的数量: 2
位数: 24
采样率(每秒): 7.5
数据接口: MICROWIRE?,串行,SPI?
工作温度: 0°C ~ 70°C
已用 IC / 零件: LTC2410
已供物品:
相关产品: DC590B-ND - BOARD DEMO USB SERIAL CONTROLLER
LTC2410IGN#PBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410CGN#TRPBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410IGN#TRPBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410CGN#PBF-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410CGN#TR-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410IGN#TR-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410IGN-ND - IC A/D CONV 24BIT MICRPWR 16SSOP
LTC2410CGN-ND - IC ADC 24BIT DIFF INP/REF 16SSOP
LTC2410
45
TYPICAL APPLICATIO S
U
**********************************
* The next short loop waits for the
*
* LTC2410's conversion to finish before *
* starting the SPI data transfer
*
**********************************
*
CONVEND LDAA
PORTD
Retrieve the contents of port D
ANDA
#%00000100
Look at bit 2
*
Bit 2 = Hi; the LTC2410's conversion is not
*
complete
*
Bit 2 = Lo; the LTC2410's conversion is complete
BNE
CONVEND
Branch to the loop's beginning while bit 2 remains
high
*
********************
* The SPI data transfer *
********************
*
TRFLP1
LDAA
#$0
Load accumulator A with a null byte for SPI transfer
STAA
SPDR
This writes the byte in the SPI data register and starts
*
the transfer
WAIT1
LDAA
SPSR
This loop waits for the SPI to complete a serial
transfer/exchange by reading the SPI Status Register
BPL
WAIT1
The SPIF (SPI transfer complete flag) bit is the SPSR's MSB
*
and is set to one at the end of an SPI transfer. The branch
*
will occur while SPIF is a zero.
LDAA
SPDR
Load accumulator A with the current byte of LTC2410 data
that was just received
STAA
0,X
Transfer the LTC2410's data to memory
INX
Increment the pointer
CPX
#DIN4+1 Has the last byte been transferred/exchanged?
BNE
TRFLP1
If the last byte has not been reached, then proceed to the
*
next byte for transfer/exchange
BSET
PORTD,Y %00100000 This sets the SS* output bit to a logic high,
*
de-selecting the LTC2410
PULA
Restore the A register
PULY
Restore the Y register
PULX
Restore the X register
RTS
Figure 56. This is an Example of 68HC11 Code That Captures the LTC2410’s
Conversion Results Over the SPI Serial Interface Shown in Figure 55
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