DS1852 datasheet(24/25 Pages) DALLAS

Part #	DS1852

Description	Optical Transceiver Diagnostic Monitor

PDF	25 Pages

Scroll/Zoom	100%

Manufacturer	DALLAS [Dallas Semiconductor]

Direct Link	https://www.maximintegrated.com/en.html

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DS1852

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begin

bestTrim := trim;

if (Bit > 11) then

Begin

trim := trim - lshft(1,trimBit);

end;

(* The upper 4 bits of bestTrim contains the answer for the course adjustment.*)

(* It is the smallest value that allows full scale trim with the lower 12 bits*)

(* zero out the lower 12 bits of bestTrim *)

trim := land(bestTrim,61440(*F000h*)); (*land() is logical AND function*)

(*Use SAR approach to trim resolution on VAD scale bits 11-0*)

for Bit := 11 downto -1 do (* must go 1 bit too far so that zero is

possible solution *)

begin

if (Bit > 0) then

begin

trim := trim + lshft(1,Bit);

end;

writeTrimValue(trim);

waitForNewConversion;

Dec_out := readVoltage;

delta := Dec_out - Dec_in;

if ( abs(delta) <= abs(bestDelta) ) then

begin

bestTrim := trim;

bestDelta := delta;

end;

if ( delta > 0 ) then

begin

if (Bit > 0) then

Begin

trim := trim - lshft(1,trimBit);

end;

(* bestTrim now contains the trim that gives the lowest delta*)

ProgramTrim(bestTrim);

end;

DS1852 Datasheet(PDF) 24 Page - Dallas Semiconductor