DS2890X 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2890X

1-Wire® Digital Potentiometer

Dallas Semiconductor -> Maxim Integrated 

DS2890

AC ELECTRICAL CHARACTERISTICS - OVERDRIVE 1-WIRE SPEED

2.8V ≤ VPUP ≤ 6.0V, -40°C ≤ TA ≤ +85°C

PARAMETER

SYMBOL MIN TYP MAX UNITS NOTES

Recovery Time

tREC

1

µs

Reset High Time

tRSTH

48

µs

Reset Low Time

tRSTL

48

80

µs

Presence Detect High

tPDH

2

6

µs

Presence Detect Low

tPDL

8

24

µs

NOTES:

1. The optimal sampling point for the master is as close as possible to the end time of the 2 µs tRDV

period without exceeding tRDV. 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(s) release the line (tRELEASE = 0).

2. 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.

3. An additional reset or communication sequence cannot begin until the reset high time (tRSTH) has

expired.

4. The reset low time (tRSTL) should be restricted to a maximum of 960 µs, to allow interrupt signaling,

otherwise, it could mask or conceal interrupt pulses.

CAPACITANCE

PARAMETER

1-Wire Pin

VDD Pin

Resistor Terminals

TA = 25°C

SYMBOL MIN TYP MAX UNITS NOTES

800

pF

1

10

pF

10

pF

NOTE:

1. Capacitance on the 1-Wire pin could be 800 pF when power is first applied. If a 5 kΩ is used to pull

up the 1-Wire line to VPUP, the capacitance will not affect communications after a 5 µs charge time.

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