Table 9: Power down/up trip points DC characteristics
Sym Parameter
(1)(2)
Min Typ Max Unit
V
PFD
Power-fail deselect
2.5 2.6 2.7 V
Hysteresis
25
mV
V
SO
Battery backup switchover voltage
V
BAT
< V
PFD
V
BAT
V
V
BAT
> V
PFD
V
PFD
V
Hysteresis
40
mV
t
DR
Expected data retention time
10
Years
Notes:
(1)
Valid for ambient operating temperature: T
A
= –40 to 85 °C; V
CC
= 2.7 to 5.5 V (except where noted).
(2)
All voltages referenced to V
SS
.
(3)
T
A
= 25°C, V
CC
= 0 V, oscillator on.
Figure 14: Bus timing requirements sequence
Table 10: AC characteristics
Sym Parameter
(1)
Min Typ Max Units
fSCL
SCL clock frequency 0 - 400 kHz
tLOW
Clock low period 1.3 -
µs
tHIGH
Clock high period 600 -
ns
tR
SDA and SCL rise time
- 300 ns
tF
SDA and SCL fall time
- 300 ns
tHD:STA
START condition hold time
(after this period the first clock pulse is
generated)
600 -
ns
tSU:STA
START condition setup time
(only relevant for a repeated start condition)
600 -
ns
tSU:DAT
(2)
Data setup time 100 -
ns
tHD:DAT
Data hold time 0 -
µs
tSU:STO
STOP condition setup time 600 -
ns
tBUF
Time the bus must be free before a new
transmission can start
1.3 -
µs
Notes:
(1)
Valid for ambient operating temperature: T
A
= 0 to 70 °C; V
CC
= 2.7 to 5.5 V (except where noted).
(2)
Transmitter must internally provide a hold time to bridge the undefined region (300 ns max) of the falling edge of SCL.
AI00589
S DA
P
tSU:S TOtSU:S TA
tHD:S
TA
Sr
SCL
tSU:
DA
T
tF
tHD:DAT
tR
tHIGH
tLO
W
tHD:S T
AtBUF
SP
DocID014557 Rev 6 19/24
