CHAPTER 20 ELECTRICAL SPECIFICATIONS
User’s Manual U13850EJ6V0UD
627
(10) I
2
C bus mode (Y versions only) (1/2)
(T
A
= –40 to +85°C, V
DD
= 4.0 to 5.5 V, BV
DD
= EV
DD
= 3.0 to 5.5 V, V
SS
= AV
SS
= BV
SS
= EV
SS
= 0 V)
Normal Mode
High-Speed Mode
Parameter
Symbol
MIN.
MAX.
MIN.
MAX.
Unit
SCLn clock frequency
–
f
CLK
0
100
0
400
kHz
Bus-free time (between
stop/start conditions)
<74>
t
BUF
4.7
–
1.3
–
µ
s
Hold time
Note 1
<75>
t
HD:STA
4.0
–
0.6
–
µ
s
SCLn clock low-level width
<76>
t
LOW
4.7
–
1.3
–
µ
s
SCLn clock high-level width
<77>
t
HIGH
4.0
–
0.6
–
µ
s
Setup time for start/restart
conditions
<78>
t
SU:STA
4.7
–
0.6
–
µ
s
CBUS
compatible
master
5.0
–
–
–
µ
s
Data hold
time
I
2
C mode
<79>
t
HD:DAT
0
Note 2
–
0
Note 2
0.9
Note 3
µ
s
Data setup time
<80>
t
SU:DAT
250
–
100
Note 4
–
ns
SDAn and SCLn signal rise
time
<81>
t
R
–
1000
20 + 0.1Cb
Note 5
300
ns
SDAn and SCLn signal fall
time
<82>
t
F
–
300
20 + 0.1Cb
Note 5
300
ns
Stop condition setup time
<83>
t
SU:STO
4.0
–
0.6
–
µ
s
Pulse width of spike
suppressed by input filter
<84>
t
SP
–
–
0
50
ns
Capacitance load of each
bus line
–
Cb
–
400
–
400
pF
Notes 1.
At the start condition, the first clock pulse is generated after the hold time.
2.
The system requires a minimum of 300 ns hold time internally for the SDAn signal (at V
IHmin.
.
of SCLn
signal) in order to occupy the undefined area at the falling edge of SCLn.
3.
If the system does not extend the SCLn signal low hold time (t
LOW
), only the maximum data hold time
(t
HD
:
DAT
) needs to be satisfied.
4.
The high-speed mode I
2
C bus can be used in the normal-mode I
2
C bus system. In this case, set the
high-speed mode I
2
C bus so that it meets the following conditions.
•
If the system does not extend the SCLn signal’s low state hold time:
t
SU
:
DAT
≥
250 ns
•
If the system extends the SCLn signal’s low state hold time:
Transmit the following data bit to the SDAn line prior to the SCLn line release (t
Rmax.
+ t
SU
:
DAT
= 1000
+ 250 = 1250 ns: Normal mode I
2
C bus specification).
5.
Cb: Total capacitance of one bus line (unit: pF)
Remark
n = 0, 1
Содержание V850/SB1
Страница 2: ...User s Manual U13850EJ6V0UD 2 MEMO ...