Rainbow-electronics DS2482-800 Manual do Utilizador descarregar pdf (Página 3)

DS2482-800: Eight-Channel 1-Wire Master

3 of 22

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Standard 60 64 68

Write 0 Low Time t

W0L

Overdrive 7.1 7.5 7.9

µs

Standard 5.0 5.3 5.6

Write 0 Recovery Time t

REC0

Overdrive 2.8 3.0 3.2

µs

Standard 570 600 630

Reset Low Time t

RSTL

Overdrive 68.4 72 75.6

µs

Standard 66.5 70 73.5

Presence-Detect Sample Time t

MSP

Overdrive 7.1 7.5 7.9

µs

Standard 7.6 8 8.4

Sampling for Short and

Interrupt

t

SI

Overdrive 0.7 0.75 0.8

µs

Standard 554.8 584 613.2

Reset High Time t

RSTH

Overdrive 70.3 74 77.7

µs

Presence Pulse Mask Start t

ppm1

(Note 7) 9.5 10 10.5 µs

Presence Pulse Mask Stop t

ppm2

(Note 7) 57 60 63 µs

I²C-Pins (Note 8) See Figure 10

V

CC

= 2.9V to 3.7V

0.25 ×

V

CC

LOW Level Input Voltage V

IL

V

CC

= 4.5V to 5.5V

-0.5

0.22 ×

V

CC

V

HIGH Level Input Voltage V

IH

0.7 ×

V

CC

V

CC

+

0.5V

V

Hysteresis of Schmitt Trigger

Inputs

V

hys

0.05 ×

V

CC

V

LOW Level Output Voltage at

3mA Sink Current

V

OL

0.4 V

Output Fall Time from V

Ihmin

to

V

ILmax

with a Bus Capacitance

from 10pF to 400pF

t

of

60 250 ns

Pulse Width of Spikes that are

Suppressed by the Input Filter

t

SP

SDA and SCL pins only 50 ns

Input Current Each I/O Pin with

an Input Voltage Between

0.1V

CCmax

and 0.9V

CCmax

I

i

(Notes 9, 10) -10 10 µA

Input Capacitance C

i

(Note 9) 10 pF

SCL Clock Frequency f

SCL

0 400 kHz

Hold Time (Repeated) START

Condition. After this Period, the

First Clock Pulse is Generated.

t

HD:STA

0.6 µs

LOW Period of the SCL Clock t

LOW

1.3 µs

HIGH Period of the SCL Clock t

HIGH

0.6 µs

Setup Time for a Repeated

START Condition

t

SU:STA

0.6 µs

Data Hold Time t

HD:DAT

(Notes 11, 12) 0.9 µs

Data Setup Time t

SU:DAT

(Note 13) 250 ns

Setup Time for STOP Condition t

SU:STO

0.6 µs

Bus Free Time Between a

STOP and START Condition

t

BUF

1.3 µs

Capacitive Load for Each Bus

Line

C

b

(Note 14) 400 pF

Oscillator Warm-Up Time

t

OSCWUP

(Note 15) 100 µs

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

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