LTC1417IGN(RevA) Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC1417IGN
(Rev.:RevA)

Low Power 14-Bit, 400ksps Sampling ADC Converter with Serial I/O

Linear Technology 

TYPICAL APPLICATIONS

*

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

*

*****************************************

* Initialize the LTC1417’s CONVST input *

* to a logic high before a conversion *

* start

*

*****************************************

*

BSET PORTC,Y %01000000 This sets PORTC, Bit6 output to a logic

*

high, forcing CONVST to a logic high

*

*****************************************

* Retrieve the MUX address from memory *

* and send it to the DG408

*

*****************************************

*

LDAA PORTC Capture the contents of PortC

ORAA MUX “Add” the MUX address

STAA PORTC Select the MUX channel

*

*****************************************

* Initiate a LTC1417 conversion

*

*****************************************

*

BCLR PORTC,Y %01000000 This sets PORTC, Bit6 output to a logic

*

low, initiating a conversion

BSET PORTC,Y %01000000 This resets PORTC, Bit6 output to a logic

*

high, returning CONVST to a logic high

*

*****************************************

* 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 high

*

*************************************************************************

* 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.

*

*************************************************************************

*

LTC1417

sn1417 1417fas

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