DS2480 datasheet(4/26 Pages) DALLAS

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DS2480

042498 4/26

STATE TRANSITION DIAGRAM Figure 2

INACTIVE

COMMAND MODE

CONFIGURATION

CHECK

MODE

ARRIVAL

CODE

SINGLE BIT

FUNCTION

ACCEL.

PULSE

RESET

SOFTWARE

MASTER RESET

TX E3h

TX BYTE

110XSS01

111T11Q1

N.C.

0ZZZVVV1

N.C.

101HSS01

100VSSP1

POWER

ARRIVAL

POWER OFF

CODE = E3h

E3h

100VSSP1

101HSS01

0ZZZVVV1

111T11Q1

110XSS01

E1h

ALL OTHER

CODES

ACC.ON

STR. PULL–UP

ARMED

ACC. OFF

STR. PULL–UP NOT ARMED

N.C. = UNCONDITIONAL

POWER OFF

GENERATE STRONG

PULL–UP TO 5V

LEGEND: V

BINARY VALUE (TYPE OF WRITE TIME SLOT)

1–WIRE SPEED SELECTION CODE

IF LOGIC 1, GENERATES STRONG PULL–UP TO 5V IMMEDIATELY FOLLOWING THE TIME SLOT

TYPE OF PULSE; 0 = STRONG PULL–UP (5V), 1 = PROGRAMMING PULSE (12V)

1 = ARM STRONG PULL–UP AFTER EVERY BYTE; 0 = DISARM

SEARCH ACCELERATOR CONTROL; 1 = ACCELERATOR ON, 0 = ACCELERATOR OFF

ZZZ

CONFIGURATION PARAMETER CODE (WRITE), 000 = READ CONFIGURATION PARAMETER

VVV

CONFIGURATION PARAMETER VALUE CODE (WRITE), CONFIGURATION PARAMETER CODE (READ)

DON’T CARE

CHECK SEARCH

ACCELERATOR FLAG

DATA MODE

PERFORM SEARCH

SEQUENCE

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