CHAPTER 5 ELECTRICAL SPECIFICATIONS
User’s Manual U18438EJ2V0UD
63
AC Characteristics
(1) Basic
operation
(T
A
=
−
40 to +85
°
C, 1.8 V
≤
LV
DD
≤
5.5 V, LV
SS
= 0 V)
Parameter Symbol
Conditions
MIN.
TYP.
MAX.
Unit
LCLK
400 kHz
Maximum operating frequency
SCL
400
kHz
RESET low-level width
t
RSL
10
µ
s
(2) Serial interface (IIC)
(T
A
=
−
40 to +85
°
C, 1.8 V
≤
LV
DD
≤
5.5 V, LV
SS
= 0 V)
Standard Mode
High-Speed Mode
Parameter Symbol
MIN. MAX. MIN. MAX.
Unit
SCL clock frequency
f
SCL
0 100 0 400
kHz
Setup time of start/restart condition
Note 1
t
SU:STA
4.8
−
0.7
−
µ
s
Hold time
t
HD:STA
4.1
−
0.7
−
µ
s
Hold time when SCL = “L”
t
LOW
5.0
−
1.25
−
µ
s
Hold time when SCL = “H”
t
HIGH
5.0
−
1.25
−
µ
s
Data setup time (reception)
t
SU:DAT
0
−
0
−
µ
s
Data hold time (transmission)
Note 2
t
HD:DAT
0.47
4.0
0.23
1.00
µ
s
Notes 1.
The first clock pulse is generated after this period when the start/restart condition is detected.
2.
The maximum value (MAX.) of t
HD:DAT
is during normal transfer and a wait state is inserted in the ACK
(acknowledge) timing.
Caution Only communication with IIC0 of the 78K0/Kx2 and 78K0R/Kx3 is possible.
It does not support the simplified IIC of the 78K0R/Kx3.
Timing Definition on I
2
C Bus
Stop
condition
Start
condition
Restart
condition
Stop
condition
SCL
SDA
t
LOW
t
HIGH
t
HD:STA
t
SU:DAT
t
SU:STA
t
HD:STA
t
HD:DAT