MAX6658 View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

MAX6658

±1°C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

Maxim Integrated 

±1°C, SMBus-Compatible Remote/Local Temperature

Sensors with Overtemperature Alarms

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

Figure 3. SMBus Write Timing Diagram

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

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

Figure 4. SMBus Read Timing Diagram

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

1. Initiate a one-shot conversion using Command

Byte 0Fh. When this conversion is complete, read

the contents of the Temperature Data registers.

2) If the MAX6657/MAX6658/MAX6659 are in run mode,

read the Status register. If a conversion is in

progress, the BUSY bit is set to 1. Wait for the con-

version to complete as indicated by the BUSY bit

being set to 0, then read the Temperature Data reg-

isters. Note that the power-on reset sets the conver-

sion rate to 16Hz, so no extended data is valid

without reducing the conversion rate to 4Hz or less.

Diode Fault Alarm

There is a continuity fault detector at DXP that detects

an open circuit between DXP and DXN, or a DXP short

to VCC, GND, or DXN. If an open or short circuit exists,

the external temperature register is loaded with 1000

0000. Additionally, if the fault is an open circuit, bit 2

(OPEN) of the status byte is set to 1 and the ALERT con-

dition is activated at the end of the conversion.

Immediately after POR, the Status register indicates that

no fault is present until the end of the first conversion.

10 ______________________________________________________________________________________

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