STMicroelectronics STM32WL5 Series User Manual

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

STMicroelectronics STM32WL5 Series Specifications

General

Brand	STMicroelectronics
Model	STM32WL5 Series
Category	Microcontrollers
Language	English