Rainbow-electronics DS1857 Manual do Utilizador descarregar pdf (Página 5)

DS1857

Dual Temperature-Controlled Resistors with

External Temperature Input and Monitors

_____________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS (continued)

= 3.0V to 5.5V, T

= -40°C to +95°C, unless otherwise noted.)

Note 11: After this period, the first clock pulse is generated.

Note 12: The maximum t

HD:DAT

only to has be met if the device does not stretch the LOW period (t

LOW

) of the SCL signal.

Note 13: A device must internally provide a hold time of at least 300ns for the SDA signal (see the V

IH MIN

of the SCL signal) in order

to bridge the undefined region of the falling edge of SCL.

Note 14: C

—total capacitance of one bus line, timing referenced to 0.9 x V

and 0.1 x V

Note 15: EEPROM write begins after a STOP condition occurs.

Typical Operating Characteristics

= 5.0V, T

= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

DS1857 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

806040200-20

540

580

620

660

700

500

-40 100

SUPPLY CURRENT vs. VOLTAGE

DS1857 toc02

VOLTAGE (V)

SUPPLY CURRENT (µA)

5.04.54.03.5

450

500

550

600

650

700

400

3.0 5.5

RESISTANCE vs. SETTING

DS1857 toc03

SETTING

RESISTANCE (kΩ)

25020015010050

0 300

ACTIVE SUPPLY CURRENT

vs. SCL FREQUENCY

DS1857 toc04

SCL FREQUENCY (kHz)

ACTIVE SUPPLY CURRENT (µA)

300200100

540

580

620

660

700

500

0 400

SDA = 5V

1 2 3 4 5 6 7 8 9 10 ... 21 22

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