LTC1695 데이터 시트보기 (PDF) - Linear Technology

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LTC1695

SMBus/I2C Fan Speed Controller in SOT-23

Linear Technology 

WU

W

TI I G DIAGRA

LTC1695

S

SCL

SDA

Operating Sequence

SMBus SEND BYTE PROTOCOL, WITH SMBus ADDRESS = 1110100B

P

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

19

SLAVE ADDRESS

COMMAND BYTE

1 1 1 0 1 0 0 WR ACK X BST D5 D4 D3 D2 D1 D0 ACK

S = SMBus START BIT

P = SMBus STOP BIT

BST = 1 ENABLES THE BOOST START TIMER

D5 TO D0 = 6-BIT INPUT CODE FOR THE DAC (D5 = MSB)

X = DON'T CARE

S

SCL

SDA

SMBus RECEIVE BYTE PROTOCOL, WITH SMBus ADDRESS = 1110100B

P

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

19

SLAVE ADDRESS

COMMAND BYTE

1 1 1 0 1 0 0 WR ACK OCF THE 0 0 0 0 0 0 ACK

S = SMBus START BIT

P = SMBus STOP BIT

OCF = 1 SIGNALS THAT THE LTC1695 IS IN CURRENT LIMIT

THE = 1 SIGNALS THAT THE LTC1695 IS IN THERMAL SHUTDOWN

1695 • TD01

STOP START

tBUF

SDA

tHD(STA)

SCL

tLOW

Timing for SMBus Interface

START

tr

tf

tHIGH

tHD(DAT)

tHD(STA)

tSU(DAT)

tSU(STA)

STOP

tSU(STO)

1695 • TD02

9

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