Data Sheet

MPR121 Sensor
22 Freescale Semiconductor
I
2
C AC CHARACTERISTICS
Table 6. I
2
C AC Characteristics
(Typical Operating Circuit, V
DD
and V
REG
= 1.8 V, T
A
= 25°C , unless otherwise noted.)
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Serial Clock Frequency
f
SCL
400
kHz
Bus Free Time Between a STOP and a START Condition
t
BUF
1.3
μ s
Hold Time, (Repeated) START Condition
t
HD, STA
0.6
μ s
Repeated START Condition Setup Time
t
SU, STA
0.6
μ s
STOP Condition Setup Time
t
SU, STO
0.6
μ s
Data Hold Time
t
HD, DAT
0.9
μ s
Data Setup Time
t
SU, DAT
100
ns
SCL Clock Low Period
t
LOW
1.3
μ s
SCL Clock High Period
t
HIGH
0.7
μ s
Rise Time of Both SDA and SCL Signals, Receiving
t
R
20+0 . 1C
b
300
ns
Fall Time of Both SDA and SCL Signals, Receiving
t
F
20+0 . 1C
b
300
ns
Fall Time of SDA Transmitting
t
F.TX
20+0 . 1C
b
250
ns
Pulse Width of Spike Suppressed
t
SP
25
ns
Capacitive Load for Each Bus Line
C
b
400
pF