Rainbow-electronics MAX6678 Manual do Utilizador descarregar pdf (Página 3)

MAX6678

2-Channel Temperature Monitor with Dual Automatic

PWM Fan-Speed Controller and Five GPIOs

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ELECTRICAL CHARACTERISTICS (continued)

= +3.0V to +5.5V, T

= -40°C to +125°C, unless otherwise noted. Typical values are at V

= +3.3V, T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

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 Conditions

BUF

4.7 µs

SMBus Start Condition Setup Time t

SU:STA

90% of SMBCLK to 90% of SMBDATA 4.7 µs

Start Condition Hold Time t

HD:STO

10% of SMBDATA to 10% of SMBCLK 4 µs

Stop Condition Setup Time t

SU:STO

90% of SMBCLK to 10% of SMBDATA 4 µs

Data Setup Time t

SU:DAT

10% of SMBDATA to 10% of SMBCLK 250 ns

Data Hold Time t

HD:DAT

10% of SMBCLK to 10% of SMBDATA 300 ns

SMBus Fall Time t

300 ns

SMBus Rise Time t

1000 ns

SMBus Timeout t

TIMEOUT

29 37 55 ms

Startup Time After POR t

POR

500 ms

Note 1: Deviation from programmed value in Table 6.

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

400

440

520

480

560

600

3.0 4.03.5 4.5 5.0 5.5

OPERATING SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6678 toc02

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

-4

-2

-3

-1

050

100

125 150

REMOTE TEMPERATURE ERROR

vs. REMOTE-DIODE TEMPERATURE

MAX6678 toc03

TEMPERATURE (

TEMPERATURE ERROR (

FAIRCHILD 2N3906

1 2 3 4 5 6 7 8 ... 18 19

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