
μ
PD784218, 784218Y
Data Sheet  U12304EJ2V0DS00
72
(d) I
2
C bus mode (
μ
PD784218Y only)
Parameter
Symbol
Standard Mode
High-Speed Mode
Unit
MIN.
MAX.
MIN.
MAX.
SCL0 clock frequency
f
CLK
0
100
0
400
kHz
Bus free time (between stop
t
BUF
4.7
––
1.3
––
μ
s
and start conditions)
Hold time
Note1
t
HD : STA
4.0
––
0.6
––
μ
s
Low-level width of SCL0 clock
t
LOW
4.7
––
1.3
––
μ
s
High-level width of SCL0 clock
t
HIGH
4.0
––
0.6
––
μ
s
Setup time of start/restart
t
SU : STA
4.7
––
0.6
––
μ
s
conditions
Data
When using CBUS-
t
HD : DAT
5.0
––
––
––
μ
s
hold
compatible master
time
When using I
2
C bus
0
Note 2
––
0
Note 2
0.9
Note 3
μ
s
Data setup time
t
SU : DAT
250
––
100
Note 4
––
ns
Rise time of SDA0 and SCL0
t
R
––
1,000
20 + 0.1Cb
Note 5
300
ns
signals
Fall time of SDA0 and SCL0
t
F
––
300
20 + 0.1Cb
Note 5
300
ns
signals
Setup time of stop condition
t
SU : STO
4.0
––
0.6
––
μ
s
Pulse width of spike restricted
by input filter
t
SP
––
––
0
50
ns
Load capacitance of each bus
Cb
––
400
––
400
pF
line
Notes 1.
 For the start condition, the first clock pulse is generated after the hold time.
2.
 To fill the undefined area of the SCL0 falling edge, it is necessary for the device to provide an internal
SDA0 signal (on V
IHmin.
) with at least 300 ns of hold time.
3.
 If the device does not extend the SCL0 signal low hold time (t
LOW
), only maximum data hold time
t
HD : DAT
 needs to be satisfied.
4.
 The high-speed mode I
2
C bus can be used in a standard mode I
2
C bus system. In this case, the
conditions described below must be satisfied.
If the device does not extend the SCL0 signal low state hold time
t
SU : DAT
≥
 250 ns
If the device extends the SCL0 signal low state hold time
Be sure to transmit the data bit to the SDA0 line before the SCL0 line is released
(t
Rmax.
 + t
SU : DAT
 = 1,250 ns by standard mode I
2
C bus specification)
5.
 Cb: total capacitance per one bus line (unit: pF)