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MAX1618

Remote Temperature Sensor with SMBus Serial Interface

Maxim Integrated 

Remote Temperature Sensor

with SMBus Serial Interface

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +3.3V, configuration byte register = X8h, TA = -55°C to +125°C, unless otherwise noted.) (Note 5)

PARAMETER

CONDITIONS

MIN TYP

SMBus INTERFACE

STBY, SMBCLK, SMBDATA

VCC = 3.0V

2.2

Input High Voltage

VCC = 5.5V

2.4

STBY, SMBCLK, SMBDATA

Input Low Voltage

VCC = 3.0V to 5.5V

STBY, SMBCLK, SMBDATA

Input Current

Logic inputs forced to VCC or GND

-2

MAX UNITS

V

0.8

V

2

µA

SMBCLK, SMBDATA Output

Low Sink Current

SMBCLK, SMBDATA forced to 0.6V

6

ALERT Output Low Sink Current

ALERT forced to 0.4V

1

ALERT Output High Leakage

Current

ALERT forced to 5.5V

mA

mA

1

µA

Note 1: Guaranteed, but not 100% tested.

Note 2: A remote diode is any diode-connected transistor from Table 7. TR is the junction temperature of the remote diode. See

Remote Diode Selection for remote-diode forward voltage requirements. Temperature specification guaranteed for a diode

with ideality factor (MTR = 1.013). Additional error = (1.013/m - 1) · 273 + Temp where M = Ideality of remote diode used.

Note 3: The SMBus logic block is a static design that works with clock frequencies down to DC. While slow operation is possible, it

violates the 10kHz minimum clock frequency and SMBus specifications and may monopolize the bus.

Note 4: Note that a transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s

falling edge.

Note 5: Specifications from -55°C to +125°C are guaranteed by design, not production tested.

(TA = +25°C, unless otherwise noted.)

Typical Operating Characteristics

40

30

20

10

0

-10

-20

-30

-40

1

TEMPERATURE ERROR

vs. LEAKAGE RESISTANCE

PATH = DXP TO GND AND CONFIG = H00

PATH = DXP TO GND AND CONFIG = H08

PATH = DXP TO VCC (5.0V)

AND CONFIG = H08

PATH = DXP TO VCC (5.0V)

AND CONFIG = H00

10

100

LEAKAGE RESISTANCE (MΩ)

TEMPERATURE ERROR

vs. REMOTE-DIODE TEMPERATURE

2.50

2.00

1.50

1.00

0.50

0.00

-0.50

CENTRAL CMPT3904

-1.00 RANDOM SAMPLE

-55 -35 -15 5 25 45 65 85 105 125

TEMPERATURE (°C)

TEMPERATURE ERROR vs.

POWER-SUPPLY NOISE FREQUENCY

2

1

0

-1

-2

-3

VIN = 100mVp-p

-4

-5

VIN = 250mVp-p

-6

-7 VIN = SQUARE WAVE APPLIED TO

-8 VCC WITH NO 0.1µF VCC CAPACITOR

0.005

0.05

0.5

5

50

POWER-SUPPLY NOISE FREQUENCY (MHz)

4 _______________________________________________________________________________________

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