DS2890T-000 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2890T-000

1-Wire® Digital Potentiometer

Dallas Semiconductor -> Maxim Integrated 

DS2890

Figure 14. INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES”

VPULLUP

VPULLUP MIN

VIH MIN

MASTER TX

"RESET PULSE"

MASTER RX "PRESENCE PULSE"

tRSTH

VIL MAX

0V

tRSTL

tR

tPDH

tPDL

RESISTOR

MASTER

DS2890

REGULAR SPEED

480 µs ≤ tRSTL < ∞*

480 µs ≤ tRSTH < ∞**

15 µs ≤ tPDH < 60 µs

60 ≤ tPDL < 240 µs

OVERDRIVE SPEED

48 µs ≤ tRSTL < 80 µs

48 µs ≤ tRSTH < ∞**

2 µs ≤ tPDH < 6 µs

8 ≤ tPDL < 24 µs

* In order not to mask interrupt signaling by other devices on the 1-Wire bus and to prevent a power-

on reset of the parasite powered circuit, tRSTL + tR should always be less than 960 µs.

** Includes recovery time.

Figure 15. READ/WRITE TIMING DIAGRAMS

a) Write-one Time Slot

VPULLUP

VPULLUP MIN

VIH MIN

VIL MAX

0V

RESISTOR

MASTER

tSLOT

tREC

DS2890

Sampling Window

tLOW1

15µs

(OD: 2µs)

(OD: 6µs)

60µs

REGULAR SPEED

60 µs ≤ tSLOT < 120 µs

1 µs ≤ tLOW1 < 15 µs

1 µs ≤ tREC < ∞

OVERDRIVE SPEED

6 µs ≤ tSLOT < 16 µs

1 µs ≤ tLOW1 < 2 µs

1 µs ≤ tREC < ∞

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