Rainbow-electronics MAX1989 Manual do Utilizador descarregar pdf (Página 15)

MAX1668/MAX1805/MAX1989

†

Multichannel Remote/Local

Temperature Sensors

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Figure 5. SMBus Write Timing Diagram

Figure 4. SMBus Read Timing Diagram

SMBCLK

A = START CONDITION

B = MSB OF ADDRESS CLOCKED INTO SLAVE

C = LSB OF ADDRESS CLOCKED INTO SLAVE

D = R/W BIT CLOCKED INTO SLAVE

AB CD

FG H

SMBDATA

SU:STA

HD:STA

LOW

HIGH

SU:DAT

SU:STO

BUF

E = SLAVE PULLS SMBDATA LINE LOW

F = ACKNOWLEDGE BIT CLOCKED INTO MASTER

G = MSB OF DATA CLOCKED INTO MASTER

H = LSB OF DATA CLOCKED INTO MASTER

I = ACKNOWLEDGE CLOCK PULSE

J = STOP CONDITION

K = NEW START CONDITION

SMBCLK

AB CD

FG H

SMBDATA

SU:STA

HD:STA

LOW

HIGH

SU:DAT

HD:DAT

SU:STO

BUF

A = START CONDITION

B = MSB OF ADDRESS CLOCKED INTO SLAVE

C = LSB OF ADDRESS CLOCKED INTO SLAVE

D = R/W BIT CLOCKED INTO SLAVE

E = SLAVE PULLS SMBDATA LINE LOW

F = ACKNOWLEDGE BIT CLOCKED INTO MASTER

G = MSB OF DATA CLOCKED INTO SLAVE

H = LSB OF DATA CLOCKED INTO SLAVE

I = SLAVE PULLS SMBDATA LINE LOW

J = ACKNOWLEDGE CLOCKED INTO MASTER

K = ACKNOWLEDGE CLOCK PULSE

L = STOP CONDITION, DATA EXECUTED BY SLAVE

M = NEW START CONDITION

Table 8. Slave Address Decoding (ADD0

and ADD1)

Note: High-Z means that the pin is left unconnected and floating.

0011 001High-ZGND

0011 000

ADDRESS

0101 001GNDHigh-Z

0011 010V

GND

0101 011V

High-Z

0101 010

1001 101High-ZV

1001 100

GNDGND

GNDV

High-ZHigh-Z

1001 110V

ADD0 ADD1

1 2 ... 10 11 12 13 14 15 16

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