MAX1617DBR2(2000) データシートの表示（PDF） - ON Semiconductor

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MAX1617DBR2
(Rev.:2000)

SMBus Temperature Sensor with Internal and External Diode Input

ON Semiconductor 

MAX1617

DETAILED OPERATING DESCRIPTION

The MAX1617 acquires and converts temperature

information from two separate sources, both silicon junction

diodes, with a basic accuracy of ±1°C. One is located on the

MAX1617 die; the other is connected externally. The

external diode may be located on another IC die. The

analog–to–digital converter on the MAX1617 alternately

converts temperature data from the two sensors and stores

them separately in internal registers.

The system interface is a slave SMBus port with an

ALERT (SMBALERT) interrupt output. The interrupt is

triggered when one or more of four preset temperature

thresholds are tripped (see Figure 1). These four thresholds

are user–programmable via the SMBus port. Additionally,

the temperature data can be read at any time through the

SMBus port. Nine SMBus addresses are programmable for

the MAX1617, which allows for a multi–sensor

configuration. Also, there is low–power Standby mode

where temperature acquisition is suspended.

STANDBY MODE

The MAX1617 allows the host to put it into a low power

(IDD = 10 µA, max) Standby mode. In this mode, the A/D

converter is halted, and the temperature data registers are

frozen. The SMBus port operates normally. Standby mode

can be enabled with either the STBY input pin or the CHIP

STOP bit in the CONFIG register. The following table

summarizes this operation.

ASSERT

ALERT

ASSERT

ALERT

EXT_TEMP

INT_TEMP

EXT_HLIM

ASSERT

ALERT INT_HLIM

ASSERT

ALERT

EXT_LLIM

INT_LLIM

ALERT

TIME

Note: This diagram implies that the appropriate setpoint is moved,

temporarily, after each ALERT event to suppress re–assertion

of ALERT immediately after the ARA/de–assertion.

Figure 1. Temperature vs. Setpoint Event Generation

SMBus SLAVE ADDRESS

The two pins ADD1 and ADD0 are tri–state input pins

which determine the 7–bit SMBus slave address of the

MAX1617. The address is latched during POR.

Address Decode Table

ADD0

ADD1

SMBus Address

0

0

0011 000

0

open (3–state)

0011 001

Standby Mode Operation

STBY Chip Stop Bit One Shot?

0

Don’t Care Don’t Care

1

0

Don’t Care

1

1

No

1

1

Yes

Operating

Mode

Standby

Normal

Standby

Normal (1

Conversion

Only, then

Standby)

0

open (3–state)

open (3–state)

open (3–state)

1

1

1

1

0

open (3–state)

1

0

open (3–state)

1

0011 010

0101 001

0101 010

0101 011

1001 100

1001 101

1001 110

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