CS4385(2004) Просмотр технического описания (PDF) - Cirrus Logic

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CS4385
(Rev.:2004)

114 dB, 192 kHz 8-Channel D/A Converter

Cirrus Logic 

CS4385

SWITCHING CHARACTERISTICS - CONTROL PORT - I2C FORMAT

(Inputs: Logic 0 = GND, Logic 1 = VLC, CL = 30 pF)

Parameter

Symbol

Min

Max

SCL Clock Frequency

fscl

-

RST Rising Edge to Start

tirs

500

Bus Free Time Between Transmissions

tbuf

4.7

Start Condition Hold Time (prior to first clock pulse)

thdst

4.0

Clock Low time

tlow

4.7

Clock High Time

thigh

4.0

Setup Time for Repeated Start Condition

tsust

4.7

SDA Hold Time from SCL Falling

(Note 16)

thdd

0

SDA Setup time to SCL Rising

tsud

250

Rise Time of SCL and SDA

trc, trc

-

Fall Time SCL and SDA

tfc, tfc

-

Setup Time for Stop Condition

tsusp

4.7

Acknowledge Delay from SCL Falling

tack

300

100

-

-

-

-

-

-

-

-

1

300

-

1000

Notes: 16. Data must be held for sufficient time to bridge the transition time, tfc, of SCL.

Unit

kHz

ns

µs

µs

µs

µs

µs

µs

ns

µs

ns

µs

ns

RST

t irs

Stop

S tart

SDA

t buf

t hdst

t high

SCL

t

low

t

hdd

R epeated

S ta rt

t hdst

tf

t sud

t sust

tr

Figure 5. Control Port Timing - I2C Format

Stop

t susp

14

DS671A1

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