Rainbow-electronics DS1858 Uživatelský manuál stáhnout pdf (Strana 5)

DS1858

Dual Temperature-Controlled Resistors with

Three Monitors

_____________________________________________________________________ 5

AC ELECTRICAL CHARACTERISTICS (continued)

= 3.0V to 5.5V, T

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

Note 10: After this period, the first clock pulse is generated.

Note 11: The maximum t

HD:DAT

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

LOW

) of the SCL signal.

Note 12: 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 13: C

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

and 0.1 x V

Note 14: EEPROM write begins after a STOP condition occurs.

Typical Operating Characteristics

= 5.0V, T

= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

DS1858 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

806040200-20

540

580

620

660

700

500

-40 100

SUPPLY CURRENT vs. VOLTAGE

DS1858 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

DS1858 toc03

SETTING

RESISTANCE (kΩ)

25020015010050

0 300

ACTIVE SUPPLY CURRENT

vs. SCL FREQUENCY

DS1858 toc04

SCL FREQUENCY (kHz)

ACTIVE SUPPLY CURRENT (µA)

300200100

540

580

620

660

700

SDA = 5V

500

0 400

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

Three Monitors 1

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