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MAX6692MSA

Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

Maxim Integrated 

Precision SMBus-Compatible Remote/Local

Temperature Sensors with Overtemperature Alarms

Pin Description

PIN

NAME

FUNCTION

1

VCC

Supply Voltage Input, 3V to 5.5V. Bypass VCC to GND with a 0.1µF capacitor. A 200Ω series

resistor is recommended but not required for additional noise filtering.

Combined Remote-Diode Current Source and A/D Positive Input for Remote-Diode Channel. DO

2

DXP

NOT LEAVE DXP DISCONNECTED; connect DXP to DXN if no remote diode is used. Place a

2200pF capacitor between DXP and DXN for noise filtering.

3

DXN

Combined Remote-Diode Current Sink and A/D Negative Input. DXN is internally biased to one

diode drop above ground.

4

OVERT

Overtemperature Alert/Interrupt Output, Open Drain. OVERT is logic low when the temperature is

above the software-programmed threshold.

5

GND

Ground

SMBus Alert (Interrupt) Output, Open Drain. ALERT asserts when temperature exceeds user-set

6

ALERT

limits (high or low temperature). ALERT stays asserted until acknowledged by either reading the

status register or by successfully responding to an alert response address, provided that the fault

condition no longer exists. See the ALERT Interrupts section.

7

SDA

SMBus Serial-Data Input/Output, Open Drain

8

SCLK

SMBus Serial-Clock Input

Detailed Description

The MAX6648/MAX6692 are temperature sensors

designed to work in conjunction with a microprocessor

or other intelligence in thermostatic, process-control, or

monitoring applications. Communication with the

MAX6648/MAX6692 occurs through the SMBus-com-

patible serial interface and dedicated alert pins. ALERT

asserts if the measured local or remote temperature is

greater than the software-programmed ALERT high

limit or less than the ALERT low limit. ALERT also

asserts if the remote-sensing diode pins are shorted or

unconnected. The overtemperature alarm, OVERT,

asserts if the software-programmed OVERT limit is

exceeded. OVERT can be connected to fans, a system

shutdown, a clock throttle control, or other thermal-

management circuitry.

The MAX6648/MAX6692 convert temperatures to digital

data either at a programmed rate or in single conver-

sions. Temperature data is represented as 10 bits plus

sign, with the LSB equal to 0.125°C. The “main” tempera-

ture data registers (at addresses 00h and 01h) are 8-bit

registers that represent the data as 7 bits with the final

MSB indicating the diode fault status (Table 1). The

remaining 3 bits of temperature data are available in the

“extended” registers at addresses 11h and 10h (Table 2).

ADC and Multiplexer

The averaging ADC integrates over a 60ms period

(each channel, typically), with excellent noise rejection.

The multiplexer automatically steers bias currents

through the remote and local diodes. The ADC and

associated circuitry measure each diode’s forward volt-

age and compute the temperature based on this volt-

age. Both channels are automatically converted once

the conversion process has started, either in free-run-

ning or single-shot mode. If one of the two channels is

not used, the device still performs both measurements,

and the user can ignore the results of the unused chan-

Table 1. Main Temperature Data Register

Format (00h, 01h)

TEMP (°C)

130

127

126

25

0

<0

-1

-25

Diode fault

(short or open)

DIGITAL OUTPUT

0 111 1111

0 111 1111

0 111 1111

0 001 1001

0 000 0000

0 000 0000

0 000 0000

0 000 0000

1 000 0000

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