CS4220 CS4221
2
SWITCHING CHARACTERISTICS - CONTROL PORT - I C MODE (CS4221)
(TA = 25° C; VA, VD = 4.75 V - 5.25 V; Inputs: Logic 0 = DGND, Logic 1 = VD; CL = 30 pF)
Parameter
Symbol
Min
Max
Unit
I2C® Mode (SPI/I2C = 1)
SCL Clock Frequency
fscl
tirs
-
100
-
kHz
50
µs
RST rising edge to Start
(Note 15)
Bus Free Time between transmissions
Start Condition Hold Time (prior to first clock pulse)
Clock Low Time
tbuf
thdst
tlow
thigh
tsust
thdd
tsud
trc
4.7
4.0
4.7
4.0
4.7
0
-
µs
µs
µs
µs
µs
µs
ns
ns
ns
µs
ns
µs
-
-
-
Clock High Time
Setup time for repeated Start Condition
SDA hold time for SCL falling
SDA setup time to SCL rising
Rise time of SCL
-
(Note 16)
-
250
-
-
25
25
1
Fall time of SCL
tfc
-
Rise time of SDA
trd
-
Fall time of SDA
tfd
-
300
-
Setup time for Stop Condition
tsusp
4.7
Notes: 15. Not tested but guaranteed by design.
16. Data must be held for sufficient time to bridge the 300 ns transition time of SCL.
RST
t
irs
Repeated
Start
Stop
Start
Stop
t
t
rd
fd
SDA
SCL
t
t
t
t
t
buf
t
high
hdst
fc
susp
hdst
t
t
t
t
t
sust
sud
rc
low
hdd
Figure 3. I2C Control Port Timing
DS284PP3
9
CIRRUS [ CIRRUS LOGIC ]
