LC79451KB Datasheet, PDF (10/38 Pages) ON Semiconductor – Controller and Driver

LC79451KB
5-5. I²C (2-wire serial interface) Timing Characteristics
(Case without the special mention VDD = +2.5V, VSS = 0V, Ta = +25°C)
Parameter
Symbol
Conditions
min
typ
max
Unit
SCL frequency
fSCL(1)
-
-
400
kHz
Start condition setup time
tSU(5)
600
-
-
ns
Start condition hold time
tHD(3)
600
-
-
ns
SDA rise time
trDA(1)
-
-
300
ns
SDA fall time
tfDA(1)
-
-
300
ns
SCL rise time
trCL(1)
-
-
300
ns
SCL fall time
tfCL(1)
-
-
300
ns
SCL low pulse width
tPW(3)
1300
-
-
ns
SCL high pulse width
tPW(2)
600
-
-
ns
Data setup time
tSU(6)
100
-
-
ns
Data hold time
tHD(4)
0
-
900
ns
Stop condition setup time
tSU(7)
600
-
-
ns
STOP - START bus open time tBUF
1300
-
-
ns
1) I²C interface bus timing
START condition
tfCL(1)
trCL(1)
(90%)
SCL
(10%)
tSU(5)
tPW(2)
tHD(3)
tPW(3)
tSU(6)
(90%)
SDA
(10%)
STOP condition
tSU(7)
tfDA(1) trDA(1) tHD(4)
Acknowledge (ACK)
tBUF
Fig.5. I²C bus timing
2) Timing of BUSY and START Flag after setting START command in I²C interface
Output of BUSY means START Flag. During in BUSY = 1, “WAVEFORM PARAMETER” and “CONTROL
REGISTER” are write inhibit state. An internal state is charge-pump rising period before the waveform output or
during the waveform output. After outputs waveform from segment, BUSY and START Flag are automatically
canceled. (Cf. 6-3)
(ACK)
SCL
BUSY
START Flag
*2
*1
*1 Automatic charge-pump mode : charge-pump rising period (set to control register 1) + waveform
output period (set to waveform parameter)
Manual charge-pump mode : waveform output period (set to waveform parameter)
*2 BUSY and START Flag are automatically canceled.
Fig.6. I²C BUSY output, and START Flag timing
No.A2223-10/38