Table 229. Examples Of Timing Settings For Fi2Cclk = 8 Mhz; Table 230. Examples Of Timing Settings For Fi2Cclk = 16 Mhz - STMicroelectronics STM32WL5 Series Reference Manual

RM0453
Table 229. Examples of timing settings for f
Parameter
PRESC
SCLL
t 200 x 250 ns = 50 µs
SCLL
SCLH
t 196 x 250 ns = 49 µs
SCLH
(1)
t ~100 µs
SCL
SDADEL
t 2 x 250 ns = 500 ns
SDADEL
SCLDEL
t 5 x 250 ns = 1250 ns
SCLDEL
1. t is greater than t
SCL SCLL
2. t + t minimum value is 4 x t
SYNC1 SYNC2
3. t + t minimum value is 4 x t
SYNC1 SYNC2
4. t + t minimum value is 4 x t
SYNC1 SYNC2
Table 230. Examples of timing settings for f
Parameter
10 kHz
PRESC
SCLL 0xC7
t 200 x 250 ns = 50 µs
SCLL
SCLH 0xC3
t 196 x 250 ns = 49 µs
SCLH
(1)
t ~100 µs
SCL
SDADEL
t 2 x 250 ns = 500 ns
SDADEL
SCLDEL
t 5 x 250 ns = 1250 ns
SCLDEL
1. t is greater than t
SCL SCLL
2. t t minimum value is 4 x t
SYNC1 + SYNC2
3. t t minimum value is 4 x t
SYNC1 + SYNC2
4. t t minimum value is 4 x t
SYNC1 + SYNC2
34.4.11 SMBus specific features
This section is relevant only when the SMBus feature is supported (refer to
Standard-mode (Sm)
10 kHz
0x1
0xC7
20 x 250 ns = 5.0 µs
0xC3
16 x 250 ns = 4.0µs
(2)
0x2
2 x 250 ns = 500 ns
0x4
5 x 250 ns = 1250 ns
+ t due to SCL internal detection delay. Values provided for t
SCLH
= 500 ns. Example with t
I2CCLK
= 500 ns. Example with t
I2CCLK
= 500 ns. Example with t
I2CCLK
Standard-mode (Sm)
100 kHz
0x3
20 x 250 ns = 5.0 µs
16 x 250 ns = 4.0 µs
(2)
~10 µs
0x2
2 x 250 ns = 500 ns
0x4
5 x 250 ns = 1250 ns
+ t due to SCL internal detection delay. Values provided for t
SCLH
= 250 ns. Example with t
I2CCLK
= 250 ns. Example with t
I2CCLK
= 250 ns. Example with t
I2CCLK
Inter-integrated circuit (I2C) interface
Fast-mode (Fm)
100 kHz
0x1
0x13
10 x 125 ns = 1250 ns
0xF
4 x 125 ns = 500 ns
(2)
~10 µs
0x2
1 x 125 ns = 125 ns
0x4
4 x 125 ns = 500 ns
+ t
SYNC1
SYNC1
SYNC1
Fast-mode (Fm)
400 kHz
0x3
0x13
10 x 125 ns = 1250 ns
0xF
4 x 125 ns = 500 ns
(2)
~2500 ns
0x2
2 x 125 ns = 250 ns
0x4
4 x 125 ns = 500 ns
SYNC1 +
SYNC1 +
SYNC1 +
RM0453 Rev 5
= 8 MHz
I2CCLK
Fast-mode Plus (Fm+)
400 kHz
0x0
0x9
7 x 125 ns = 875 ns
0x3
4 x 125 ns = 500 ns
(3)
~2500 ns
0x1
0x3
2 x 125 ns = 250 ns
are examples only.
SCL
= 1000 ns.
SYNC2
+ t = 750 ns.
SYNC2
+ t = 655 ns.
SYNC2
= 16 MHz
I2CCLK
Fast-mode Plus (Fm+)
0x1
0x9
5 x 62.5 ns = 312.5 ns
0x3
3 x 62.5 ns = 187.5 ns
(3)
0x2
0x3
3 x 62.5 ns = 187.5 ns
are examples only.
SCL
t = 1000 ns.
SYNC2
t = 750 ns.
SYNC2
t = 500 ns.
SYNC2
500 kHz
0x0
0x6
0x3
(4)
~2000 ns
0x0
0 ns
0x1
1000 kHz
0x0
0x4
0x2
(4)
~1000 ns
0x0
0 ns
0x2
Section 34.3).
1081/1450
1113