參數(shù)資料
型號(hào)： LTC2408C
廠商： Linear Technology Corporation
英文描述： 20-Bit Universal Bus Driver With 3-State Outputs 56-TSSOP -40 to 85
中文描述： 4-/8-Channel 24位ADC的無(wú)延遲uPower
文件頁(yè)數(shù)： 33/36頁(yè)
文件大?。?/td> 351K
代理商： LTC2408C
33
LTC2404/LTC2408
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 30. LTC2408/LTC1391-684C11 MCU Digital Interface Routine
ENLWMX
TBA
ORAA
STAA
Restore contents of Accum. A
Set the MUX’s ENABLE bit
Transfer Accum. A contents to SPI register to initiate
serial transfer
Get SPI transfer status
WAITMUX If the transfer is not finished, read status
#$08
SPDR
MUXSPI
*
WAITMUX LDAA
SPSR
BPL
*
***************************************
* Enable the LTC2408
***************************************
*
BCLR
PORTD,Y %00100000 This sets the SS* output bit to a logic
*
*
***************************************
* The next short loop waits for the
* LTC2408’s conversion to finish before
* starting the SPI data transfer
***************************************
*
CONVEND LDAA
PORTD
ANDA
#%00000100
*
*
*
BNE
CONVEND
*
*
***************************************
* The SPI data transfer
***************************************
*
TRFLP1
LDAA
#$0
Load accumulator A with a null byte for SPI transfer
STAA
SPDR
This writes the byte into 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 LTC2408 data
*
that was just received
STAA
0,X
Transfer the LTC2408’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/exchage
BSET
PORTD,Y %00100000 This sets the SS* output bit to a logic
*
high, de-selecting the LTC2408
PULA
Restore the A register
PULY
Restore the Y register
PULX
Restore the X register
RTS
*
low, selecting the LTC2408
*
*
*
Retrieve the contents of port D
Look at bit 2
Bit 2 = Hi; the LTC2408’s conversion is not
complete
Bit 2 = Lo; the LTC2408’s conversion is complete
Branch to the loop’s beginning while bit 2 remains
high
*
An 8-Channel DC-to-Daylight Digitizer
The circuit in Figure 31 shows an example of the LTC2408’s
flexibility in digitizing a number of real-world physical
phenomena—from DC voltages to ultraviolet light. All of
the examples implement single-ended signal condition-
ing. Although differential signal conditioning is a preferred
approach in applications where the sensor is a bridge-
type, is located some distance from the ADC or operates
in a high ambient noise environment, the LTC2408’s low
power dissipation allows circuit operation in close prox-
imity to the sensor. As a result, conditioning the sensor
output can be greatly simplified through the use of single-
ended arrangements. In those applications where differ-
ential signal conditioning is required, chopper
相關(guān)PDF資料
PDF描述
LTC2408CG 4-/8-Channel 24-Bit uPower No Latency ADCs
LTC2408I 20-Bit Universal Bus Driver With 3-State Outputs 56-TVSOP -40 to 85
LTC2408IG 4-/8-Channel 24-Bit uPower No Latency ADCs
LTC2410CGN 20-Bit Universal Bus Driver With 3-State Outputs 56-SSOP -40 to 85
LTC2410IGN 24-Bit No Latency ADC with Differential Input and Differential Reference
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LTC2408CGPBF 制造商:Linear Technology 功能描述:ADC,LTC2408C 24bit D-S 8 ch SPI SSOP
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