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8581
SA
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JE
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NB
Page - 4 MQ372-02
7.2. AC Characteristics
* Unless otherwise specified,
GND = 0 V , V
DD
= 1.8 V to 5.5 V , Ta = −40 °C to +85 °C
Item Symbol Condition Min. Typ. Max. Unit
SCL clock frequency f
SCL
400 kHz
Start condition setup time t
SU;STA
0.6
µs
Start condition hold time t
HD;STA
0.6
µs
Data setup time t
SU;DAT
100 ns
Data hold time t
HD;DAT
0 ns
Stop condition setup time t
SU;STO
0.6
µs
Bus idle time between
start condition and stop condition
t
BUF
1.3
µs
Time when SCL = "L"
t
LOW
1.3
µs
Time when SCL = "H"
t
HIGH
0.6
µs
Rise time for SCL and SDA t
r
0.3
µs
Fall time for SCL and SDA t
f
0.3
µs
Allowable spike time on bus t
SP
50 ns
FOUT duty t
W
/t
V
DD
= 2.4 V ∼ 5.5 V
50% of V
DD
level
45 50 55 %
Timing chart
t
HD ; DAT
t
SU ; DAT
t
HD ; STA
t
LOW
t
HIGH
1 / f
SCL
t
r
t
f
t
SU ; ST
A
SD
A
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 ; ST
A
(S)
BIT 0
LSB
(R/W)
(S)
t
SP
Caution: When accessing this device, all communication from transmitting the start condition to transmitting the stop
condition after access should be completed within 0.95 seconds.
If such communication requires 0.95 seconds or longer, the I
2
C bus interface is reset by the internal bus
timeout function.