Rainbow-electronics MAX6641 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX6641

SMBus-Compatible Temperature Monitor with

Automatic PWM Fan-Speed Controller

_______________________________________________________________________________________ 3

Note 1: Timing specifications guaranteed by design.

Note 2: The serial interface resets when SMBCLK is low for more than t

TIMEOUT

Note 3: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge.

ELECTRICAL CHARACTERISTICS (continued)

= +3.0V to +5.5V, T

= 0°C to +125°C, unless otherwise noted. Typical values are at V

= 3.3V, T

= +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SMBus-COMPATIBLE TIMING (Note 1) (See Figures 2, 3)

Serial Clock Frequency f

SCLK

(Note 2) 100 kHz

Clock Low Period t

LOW

10% to 10% 4 µs

Clock High Period t

HIGH

90% to 90% 4.7 µs

Bus Free Time Between Stop and

Start Condition

BUF

4.7 µs

Hold Time After (Repeated) Start

Condition

HD:STA

4µs

S M Bus S tar t C ond i ti on S etup Ti m e

SU:STA

90% of SMBCLK to 90% of SMBDATA 4.7 µs

Start Condition Hold Time

HD:STO

10% of SMBDATA to 10% of SMBCLK 4 µs

Stop Condition Setup Time

SU:STO

90% of SMBCLK to 10% of SMBDATA 4 µs

Data Setup Time

SU:DAT

10% of SMBDATA to 10% of SMBCLK 250 ns

Data Hold Time

HD:DAT

10% of SMBCLK to 10% of SMBDATA

(Note 3)

300 ns

SMBus Fall Time t

300 ns

SMBus Rise Time t

1000

SMBus Timeout

TIMEOUT

29 37 55 ms

Startup Time After POR t

POR

500 ms

Typical Operating Characteristics

= 3.3V, T

= +25°C, unless otherwise noted.)

OPERATING SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6641 toc01

SUPPLY VOLTAGE (V)

OPERATING SUPPLY CURRENT (µA)

5.04.54.03.5

350

400

450

500

550

600

300

3.0 5.5

NO SMBus ACTIVITY

REMOTE TEMPERATURE ERROR

vs. REMOTE-DIODE TEMPERATURE

MAX6641 toc02

TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

1007525 50

-1.5

-1.0

-0.5

0.5

1.0

1.5

2.0

-2.0

0125

LOCAL TEMPERATURE ERROR

vs. DIE TEMPERATURE

MAX6641 toc03

TEMPERATURE (°C)

TEMPERATURE ERROR (°C)

100755025

-1

-2

0125

1 2 3 4 5 6 7 8 ... 16 17

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