X9409 datasheet(11/20 Pages) INTERSIL

Part #	X9409

Description	Low Noise/Low Power/2-Wire Bus

Download	20 Pages

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Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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11 / 20 page

11

FN8192.3

October 19, 2005

Increment/Decrement Wiper Counter Register (WCR)

Global Transfer Data Register (DR) to Wiper Counter Register (WCR)

Global Transfer Wiper Counter Register (WCR) to Data Register (DR)

S

T

A

R

T

device type

identifier

device

addresses

S

A

C

K

instruction

opcode

WCR

addresses

S

A

C

K

increment/decrement

(sent by master on SDA)

S

T

O

P

01

A

3

A

2

A

1

A

0

00

10

0

P

1

P

0

I/

D

I/

D

..

I/

D

I/

D

S

T

A

R

T

device type

identifier

device

addresses

S

A

C

K

instruction

opcode

DR

addresses

S

A

C

K

S

T

O

P

0

101

A

3

A

2

A

1

A

0

00

0

1

R

1

R

0

00

S

T

A

R

T

device type

identifier

device

addresses

S

A

C

K

instruction

opcode

DR

addresses

S

A

C

K

S

T

O

P

HIGH-VOLTAGE

WRITE CYCLE

0101

A

3

A

2

A

1

A

0

1000

R

1

R

0

00

SYMBOL TABLE

Guidelines for Calculating Typical Values of Bus

Pull-Up Resistors

WAVEFORM

INPUTS

OUTPUTS

Must be

steady

Will be

steady

May change

from Low to

High

Will change

from Low to

High

May change

from High to

Low

Will change

from High to

Low

Don’t Care:

Changes

Allowed

Changing:

State Not

Known

N/A

Center Line

is High

Impedance

120

100

80

40

60

20

40

60

80 100 120

0

Bus Capacitance (pF)

Min.

Resistance

Max.

Resistance

RMAX=

CBUS

tR

RMIN =

IOL MIN

VCC MAX

=1.8k

Ω

X9409

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