Rainbow-electronics DS2506 Manual do Utilizador descarregar pdf (Página 25)

DS2506

25 of 25

AC ELECTRICAL CHARACTERISTICS OVERDRIVE SPEED

PUP

=2.8V to 6.0V; -40°C to 70°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Time Slot t

SLOT

616µs

Write 1 Low Time t

LOW1

12µs

Write 0 Low Time t

LOW0

616µs

Read Data Valid t

RDV

2µs12

Release Time t

RELEASE

0 1.5 4 µs

Read Data Setup t

1µs 5

Recovery Time t

REC

1µs

Reset Time High t

RSTH

48 µs 4

Reset Time Low t

RSTL

48 80 µs

Presence Detect High t

PDHIGH

26µs

Presence Detect Low t

PDLOW

824µs

NOTES:

1. All voltages are referenced to ground.

2. V

PUP

= external pullup 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.

6. V

is a function of the external pullup resistor and V

PUP

7. 30 nanocoulombs per 72 time slots @ 5.0V.

8. At V

=5.0V with a 5 kΩ pullup to V

and a maximum time slot of 120 µs.

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

pullup the data line to V

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

normal communications.

10. Under certain low voltage conditions V

ILMAX

may have to be reduced to as much as 0.5V to always

guarantee a presence pulse.

11. Operational temperature range for memory programming is -40°C to +50°C.

12. For read-data time slots the optimal sampling point for the master is as close as possible to the end

time of the t

RDV

period without exceeding 15 µs for regular speed or 2 µs for overdrive speed. For the

case of a read-one time slot, this maximizes the amount of time for the pull-up resistor to recover the

line to a high level. For a read-zero time slot it ensures that a read will occur before the fastest 1-Wire

device releases the line (t

RELEASE

= 0).

1 2 ... 20 21 22 23 24 25

Comentários a estes Manuais

Sem comentários

Rainbow-electronics DS2506 Manual do Utilizador Página 25

Comentários a estes Manuais

Manuais e produtos relacionados com Painel de controlo Rainbow-electronics DS2506