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Rainbow Electronics DS2778 User Manual

Page 41

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DS2775/DS2776/DS2777/DS2778

2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with

Protector and Optional SHA-1 Authentication

______________________________________________________________________________________

41

RESISTOR PULLUP

BUS MASTER ACTIVE LOW

LINE TYPE LEGEND:

SLAVE ACTIVE LOW

BOTH BUS MASTER AND
SLAVE ACTIVE LOW

t

SLOT

t

LOW0

t

REC

t

REC

t

LOW1

> 1

μs

> 1

μs

t

SLOT

t

SLOT

t

RDV

t

RDV

30

μs

15

μs

3

μs

2

μs

15

μs

2

μs

15

μs

2

μs

1

μs

t

SLOT

V

PULLUP

WRITE-ZERO SLOT

WRITE-ONE SLOT

READ-ZERO SLOT

READ-ONE SLOT

GND

V

PULLUP

GND

MASTER SAMPLE WINDOW

MASTER SAMPLE WINDOW

MODE:

STANDARD

MODE:

OVERDRIVE

STANDARD

OVERDRIVE

DEVICE SAMPLE WINDOW

MIN

TYP

MAX

DEVICE SAMPLE WINDOW

MIN

TYP

MAX

15

μs

30

μs

15

μs

3

μs

2

μs

1

μs

15

μs

Figure 30. 1-Wire Write and Read Time Slots