EFM32WG332 Datasheet, PDF (50/76 Pages) Silicon Laboratories – Operation from backup battery when main power drains out

Table 3.21. I2C Fast-mode (Fm)
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Symbol
Parameter
Min
Typ
Max
Unit
f_SCL
SCL clock frequency
0
400¹ kHz
t_LOW
SCL clock low time
1.3
µs
t_HIGH
SCL clock high time
0.6
µs
t_SU,DAT
t_HD,DAT
SDA set-up time
SDA hold time
100
ns
8
900^2,3 ns
t_SU,STA
Repeated START condition set-up time
0.6
µs
t_HD,STA
(Repeated) START condition hold time
0.6
µs
t_SU,STO
STOP condition set-up time
0.6
µs
t_BUF
Bus free time between a STOP and a START condi-
1.3
µs
tion
1_{For the minimum HFPERCLK frequency required in Fast-mode, see the I2C chapter in the EFM32WG Reference Manual.}
2_{The maximum SDA hold time (tHD,DAT) needs to be met only when the device does not stretch the low time of SCL (tLOW).}
3_{When transmitting data, this number is guaranteed only when I2Cn_CLKDIV < ((900*10}-9 _{[s] * fHFPERCLK [Hz]) - 4).}
Table 3.22. I2C Fast-mode Plus (Fm+)
Symbol
Parameter
Min
Typ
Max
Unit
f_SCL
SCL clock frequency
0
1000¹ kHz
t_LOW
SCL clock low time
0.5
µs
t_HIGH
SCL clock high time
0.26
µs
t_SU,DAT
SDA set-up time
50
ns
t_HD,DAT
SDA hold time
8
ns
t_SU,STA
Repeated START condition set-up time
0.26
µs
t_HD,STA
(Repeated) START condition hold time
0.26
µs
t_SU,STO
STOP condition set-up time
0.26
µs
t_BUF
Bus free time between a STOP and a START condi-
0.5
µs
tion
1_{For the minimum HFPERCLK frequency required in Fast-mode Plus, see the I2C chapter in the EFM32WG Reference Manual.}
2014-06-13 - EFM32WG332FXX - d0191_Rev1.40
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