Rainbow-electronics MAX6640 Manual do Utilizador descarregar pdf (Página 3)

MAX6640

2-Channel Temperature Monitor with Dual

Automatic PWM Fan-Speed Controller

_______________________________________________________________________________________ 3

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

= +85°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DIGITAL INPUTS AND OUTPUTS

ALERT, FANFAIL, THERM, OT

SDA I

SINK

= 6mA

0.4

Output Low Voltage (Sink

Current) (OT, ALERT, FANFAIL,

THERM, SDA, PWM1, and PWM2)

PWM1, PWM2, I

SINK

= 4mA 0.4

Output High Leakage Current

(OT, ALERT, FANFAIL, THERM,

SDA, PWM1, and PWM2)

1µA

Logic-Low Input Voltage (SDA,

SCL, THERM, TACH1, TACH2)

0.8 V

= 3.3V 2.1

Logic-High Input Voltage (SDA,

SCL, THERM, TACH1, TACH2)

= 5.5V 2.6

Input Leakage Current (SDA,

SCL, THERM, TACH1, TACH2)

= V

or GND 1 µA

Input Capacitance C

5pF

SMBus TIMING (Note 2)

Serial Clock Frequency f

SCL

(Note 3) 10 100 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

SMBus Start Condition Setup

Time

SU:STA

90% of SMBCLK to 90% of SMBDATA 4.7 µs

Start Condition Hold Time

HD:STO

10% of SDA to 10% of SCL 4 µs

Stop Condition Setup Time

SU:STO

90% of SCL to 10% of SDA 4 µs

Data Setup Time

SU:DAT

10% of SDA to 10% of SCL

250

Data Hold Time

HD:DAT

10% of SCL to 10% of SDA (Note 4)

300

SMBus Fall Time t

300 ns

SMBus Rise Time t

1000

SMBus Timeout

TIMEOUT

58 74 90 ms

Note 1: All parameters tested at a single temperature. Specifications are guaranteed by design.

Note 2: Timing specifications guaranteed by design.

Note 3: The serial interface resets when SCL is low for more than t

TIMEOUT

Note 4: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL's falling edge.

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