Rainbow-electronics DS2740 Manual de usuario descargar pdf (Pagina 13)

DS2740

13 of 15

READ-TIME SLOTS

A read-time slot is initiated when the bus master pulls the 1-Wire bus line from a logic-high level to a

logic-low level. The bus master must keep the bus line low for at least 1ms and then release it to allow the

DS2740 to present valid data. The bus master can then sample the data t

RDV

from the start of the read-

time slot. By the end of the read-time slot, the DS2740 releases the bus line and allows it to be pulled

high by the external pullup resistor. All read-time slots must be t

SLOT

in duration with a 1ms minimum

recovery time, t

REC

, between cycles. See Figure 12 for more information.

Figure 12. 1-WIRE WRITE- AND READ-TIME SLOTS

LINE TYPE LEGEND:

Bus master active low

DS2740 active low

Resistor pullup

Both bus master and

DS2740 active low

SLOT

PULLUP

GND

READ 0 SLOT

READ 1 SLOT

SLOT

REC

RDV

Master Sample Window

RDV

PULLUP

GND

SLOT

Standard

LOW1

SLOT

WRITE 0 SLOT WRITE 1 SLOT

LOW0

REC

DS2740 Sample Window

MIN TYP MA

s15

s 30

DS2740 Sample Window

MIN TYP MA

s15

s 30

Overdrive

Mode

s 3

s 1

s 3

1 2 ... 8 9 10 11 12 13 14 15

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Rainbow-electronics DS2740 Manual de usuario Pagina 13

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