CDB4227 데이터 시트보기 (PDF) - Cirrus Logic

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CDB4227

Six Channel, 20-Bit Codec

Cirrus Logic 

CS4227

SWITCHING CHARACTERISTICS - CONTROL PORT (TA = 25 °C; VA+, VD+ = +5 V ±5%;

Inputs: logic 0 = DGND, logic 1 = VD+; CL = 30 pF)

Parameter

Symbol

Min

I2C® Mode (SPI/I2C = 1)

(Note 17)

SCL Clock Frequency

fscl

-

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 for SCL Falling

(Note 18)

thdd

0

SDA Setup Time to SCL Rising

tsud

250

Rise Time of Both SDA and SCL Lines

tr

-

Fall Time of Both SDA and SCL Lines

tf

-

Setup Time for Stop Condition

tsusp

4.7

Max

Unit

100

kHz

-

µs

-

µs

-

µs

-

µs

-

µs

-

µs

-

ns

1

µs

300

ns

-

µs

Notes: 17. I2C® is a registered trademark of Philips Semiconductors.

18. Data must be held for sufficient time to bridge the 300 ns transition time of SCL.

Stop Start

Repeated

Start

SDA

t buf

t hdst

t high

t hdst

tf

SCL

t

t

low

hdd

t sud

t sust

tr

Figure 4. Control Port I2C Mode

Stop

t susp

DS281PP2

9

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