Rainbow-electronics DS1993 Manual do Utilizador descarregar pdf (Página 23)

DS1992/DS1993/DS1994

23 of 23 102199

NOTES:

1. All voltages are referenced to ground.

2. V

PUP

= external pull–up voltage.

3. Input load is to ground.

4. An additional reset or communication sequence cannot begin until the reset high time has expired.

5. Read data setup time refers to the time the host must pull the 1–Wire bus low to read a bit. Data is

guaranteed to be valid within 1 µs of this falling edge and will remain valid for 14 µs minimum. (15

µs total from falling edge on 1–Wire bus.)

6. Capacitance on the data line could be 800 pF when power is first applied. If a 5 kΩ resistor is used to

pull–up the data line to V

, 5 µs after power has been applied, the parasite capacitance will not affect

normal communications.

7. The reset low time (t

RSTL

) should be restricted to a maximum of 960 µs, to allow interrupt signaling,

otherwise, it could mask or conceal interrupt pulses.

8. V

is a function of the external pull–up resistor and the V

power supply (DS1992, DS1993 only).

9. DS1994 only.

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Rainbow-electronics DS1993 Manual do Utilizador Página 23