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MAX1617MEE

Remote/Local Temperature Sensor with SMBus Serial Interface

Maxim Integrated 

MAX1617

Remote/Local Temperature Sensor

with SMBus Serial Interface

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

Figure 4. 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 = SLAVE PULLS SMBDATA LINE LOW

H

IJ

K

LM

tSU:STO tBUF

J = ACKNOWLEDGE CLOCKED INTO MASTER

K = ACKNOWLEDGE CLOCK PULSE

L = STOP CONDITION, DATA EXECUTED BY SLAVE

M = NEW START CONDITION

A

B

C

D

EF

G

tLOW tHIGH

SMBCLK

H

I

J

K

SMBDATA

tSU:STA tHD:STA

tSU: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 MASTER

H = LSB OF DATA CLOCKED INTO MASTER

Figure 5. SMBus Read Timing Diagram

tSU:STO tBUF

I = ACKNOWLEDGE CLOCK PULSE

J = STOP CONDITION

K = NEW START CONDITION

Programming Example:

Clock-Throttling Control for CPUs

An untested example of pseudocode for proportional

temperature control of Intel mobile CPUs via a power-

management microcontroller is given in Listing 1. This

program consists of two main parts: an initialization

routine and an interrupt handler. The initialization routine

checks for SMBus communications problems and sets

up the MAX1617 configuration and conversion rate. The

interrupt handler responds to ALERT signals by reading

the current temperature and setting a CPU clock duty

factor proportional to that temperature. The relationship

between clock duty and temperature is fixed in a lookup

table contained in the microcontroller code.

Note: Thermal management decisions should be made

based on the latest temperature obtained from the

MAX1617 rather than the value of the Status Byte. The

MAX1617 has a very quick response to changes in its

environment due to its sensitivity and its small thermal

mass. High and low alarm conditions can exist in the

Status Byte due to the MAX1617 correctly reporting envi-

ronmental changes around it.

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