RX8804CE
Page - 5
ETM59E-05
7.2. AC Characteristics
Table 6 AC Characteristics
* Unless otherwise specified, GND
=
0
V
,
V
DD
=
1.6
V
to
5.5
V
,
Ta
=
−
40
C
to
+105
C
Item
Symbol
Condition
SCL = 100 kHz
Standard Mode
SCL = 400 kHz
Fast Mode
Unit
Min.
Max.
Min.
Max.
SCL clock frequency
f
SCL
−
−
100
−
400
kHz
Start condition setup time
t
SU;STA
−
4.7
−
0.6
−
µs
Start condition hold time
t
HD;STA
−
4.0
−
0.6
−
µs
Data setup time
t
SU;DAT
−
250
−
100
−
ns
Data hold time
t
HD;DAT
−
0
−
0
−
ns
Stop condition setup time
t
SU;STO
−
4.0
−
0.6
−
µs
Bus idle time between
start condition and stop condition
t
BUF
−
4.7
−
1.3
−
µs
Time when SCL =
”L”
t
LOW
−
4.7
−
1.3
−
µs
Time when SCL =
“H”
t
HIGH
−
4.0
−
0.6
−
µs
Rise time for SCL and SDA
t
r
−
−
1.0
−
0.3
µs
Fall time for SCL and SDA
t
f
−
−
0.3
−
0.3
µs
Allowable spike time on bus
t
SP
−
−
50
−
50
ns
Timing chart
t
HD ; DAT
t
SU ; DAT
t
HD ; STA
t
LOW
t
HIGH
1 / f
SCL
t
r
t
f
t
SU ; STA
SDA
SCL
START
CONDITION
(S)
BIT 7
MSB
(A7)
BIT 6
(A6)
ACK
(A)
Protocol
t
BUF
t
SU ; STO
STOP
CONDITION
(P)
START
CONDITION
(S)
(P)
(A)
t
HD ; STA
t
SU ; STA
(S)
BIT 0
LSB
(R/W)
(S)
t
SP
Figure 3 I
2
C-Bus Timing Chart
Note
1. As for the communication time of I
2
C-Bus, completion of less than 1 second is recommended.
If such communication requires 1 second (Max.) or longer, the I
2
C-Bus interface is reset by the internal bus timeout
function. When bus-time-out occur, SDA is released to Hi-Z input mode.
2.
But readout data of a clock is stable anytime, and there isn’t contradiction.
And it does not occur
that data of a clock delay even if access time is prolonged.