Cirrus-logic CS4385 Manual de usuario descargar pdf (Pagina 17)

DS671F2 17

CS4385

SWITCHING CHARACTERISTICS - CONTROL PORT - I²C FORMAT

Inputs: Logic 0 = GND, Logic 1 = VLC, C

=20pF.

Notes:

18. Data must be held for sufficient time to bridge the transition time, t

, of SCL.

Parameter Symbol Min Max Unit

SCL Clock Frequency f

scl

- 100 kHz

RST

Rising Edge to Start t

irs

500 - ns

Bus Free Time Between Transmissions t

buf

4.7 - µs

Start Condition Hold Time (prior to first clock pulse) t

hdst

4.0 - µs

Clock Low time t

low

4.7 - µs

Clock High Time t

high

4.0 - µs

Setup Time for Repeated Start Condition t

sust

4.7 - µs

SDA Hold Time from SCL Falling (Note 18) t

hdd

0-µs

SDA Setup time to SCL Rising t

sud

250 - ns

Rise Time of SCL and SDA t

, t

-1µs

Fall Time SCL and SDA t

, t

-300ns

Setup Time for Stop Condition t

susp

4.7 - µs

Acknowledge Delay from SCL Falling t

ack

300 1000 ns

buf

hdst

low

hdd

high

sud

sust

susp

Stop Start

Start

Stop

Repeated

SDA

SCL

irs

RST

Figure 5. Control Port Timing - I²C Format

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 54 55

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Cirrus-logic CS4385 Manual de usuario Pagina 17

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