MAX6656 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX6656

Dual Remote/Local Temperature Sensors and Four-Channel Voltage Monitors

Maxim Integrated 

Dual Remote/Local Temperature Sensors and

Four-Channel Voltage Monitors

A

B

C

D

EF

G

tLOW tHIGH

SMBCLK

SMBDATA

tSU:STA tHD:STA

tSU:DAT

tHD:DAT

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 = MASTER PULLS DATA LINE LOW

Figure 2. SMBus/I2C Write Timing Diagram

H

I JK

LM

tSU:STO tBUF

J = ACKNOWLEDGE CLOCKED INTO SLAVE

K = ACKNOWLEDGE CLOCK PULSE

L = STOP CONDITION

M = NEW START CONDITION

A

B

C

D

EF

G

tLOW tHIGH

SMBCLK

H

I JK

LM

SMBDATA

tSU:STA tHD:STA

tSU:DAT

tHD:DAT

tSU:STO tBUF

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 MASTER

H = LSB OF DATA CLOCKED INTO MASTER

I = MASTER PULLS DATA LINE LOW

J = ACKNOWLEDGE CLOCKED INTO SLAVE

K = ACKNOWLEDGE CLOCK PULSE

L = STOP CONDITION

M = NEW START CONDITION

Figure 3. SMBus/I2C Read Timing Diagram

SMBus Digital Interface

From a software perspective, the MAX6655/MAX6656

appear as a set of byte-wide registers that contain tem-

perature data, voltage data, alarm threshold values,

and control bits. Use a standard SMBus 2-wire serial

interface to read temperature data and write control

bits and alarm threshold data.

The MAX6655/MAX6656 employ four standard SMBus

protocols: Write Byte, Read Byte, Send Byte, and

Receive Byte (Figures 1, 2, and 3). The two shorter pro-

tocols (Receive and Send) allow quicker transfers, pro-

vided that the correct data register was previously

selected by a Write or Read Byte instruction. Use cau-

tion with the shorter protocols in multimaster systems,

since a second master could overwrite the Command

Byte without informing the first master.

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