参数资料
型号: LTC1417AIGN#PBF
厂商: Linear Technology
文件页数: 18/32页
文件大小: 0K
描述: IC A/D CONV 14BIT SAMPLNG 16SSOP
标准包装: 100
位数: 14
采样率(每秒): 400k
数据接口: MICROWIRE?,串行,SPI?
转换器数目: 1
功率耗散(最大): 27.5mW Unipolar; 44mW Bipolar
电压电源: 双 ±
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SSOP(0.154",3.90mm 宽)
供应商设备封装: 16-SSOP
包装: 管件
输入数目和类型: 2 个单端,单极;2 个单端,双极;1 个差分,单极;1 个差分,双极
25
LTC1417
sn1417 1417fas
*
(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.)
GETDATAPSHX
PSHY
PSHA
*
*****************************************
* Setup indecies
*
*****************************************
*
LDX
#$0
The X register is used as a pointer to the memory
*
locations that hold the conversion data
LDY
#$1000
*
*****************************************
* The next short loop ensures that the
*
* LTC1417’s conversion is finished
*
* before starting the SPI data transfer *
*****************************************
*
CONVENDLDAA
PORTC
Retrieve the contents of port D
ANDA
#%10000000
Look at Bit7
*
Bit7 = Hi; the LTC1417’s conversion is complete
*
Bit7 = Lo; the LTC1417’s conversion is not
*
complete
BPL
CONVEND
Branch to the loop’s beginning while Bit7 remains
*
low
*
*************************************************************************
* 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
Two logical shifts to the right to right justify the
*
14-bit conversion results
STD
DIN1
Place right justified result back in memory
TYPICAL APPLICATIONS
U
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