Rainbow-electronics DS1678 Bedienungsanleitung PDF herunterladen (Seite 21)

DS1678

21 of 26

AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C, V

= 4.5V to 5.5V)

PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES

SCL Clock Frequency f

scl

Fast Mode

Standard Mode

100 400

100

kHz

Bus Free Time

Between a STOP and

START Condition

buf

Fast Mode

Standard Mode

1.3

4.7

µs

Hold Time (Repeated)

START Condition.

hd:sta

Fast Mode

Standard Mode

0.6

4.0

µs 1

LOW Period of SCL t

low

Fast Mode

Standard Mode

1.3

4.7

µs

HIGH Period of SCL t

high

Fast Mode

Standard Mode

0.6

4.0

µs

Set-Up Time for a

Repeated START

su:sta

Fast Mode

Standard Mode

0.6

4.7

µs

Data Hold Time t

hd:dat

Fast Mode

Standard Mode

0.9 µs 2

Data Set-up Time t

su:dat

Fast Mode

Standard Mode

100

250

ns 3

Rise Time of Both

SDA and SCL Signals

Fast Mode

Standard Mode

20 +

0.1C

300

1000

ns 4

Fall Time of Both

SDA and SCL Signals

Fast Mode

Standard Mode

20 +

0.1C

300

ns 4

Set-up Time for STOP t

su:sto

Fast Mode

Standard Mode

0.6

4.0

µs

Capacitive Load for

Each Bus Line

400 pF 4

Input Capacitance C

5pF

DATA TRANSFER ON 2-WIRE SERIAL BUS Figure 3

MSB

slave address

R/W

direction

bit

SDA

SCL

START

CONDITION

12 6789

12 89

STOP CONDITION

REPEATED

START CONDITION

3 - 8

acknowledgement

signal from receiver

acknowledgement

signal from receiver

ACK ACK

repeated if more bytes

are transferred

1 2 ... 16 17 18 19 20 21 22 23 24 25 26

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