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STM32F372VBT6 Datasheet, PDF (91/131 Pages) STMicroelectronics – ARM Cortex-M4 32b MCU+FPU, up to 256KB Flash+32KB SRAM
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STM32F37xxx
Electrical characteristics
6.3.16
Communications interfaces
I2C interface characteristics
The I2C interface meets the requirements of the standard I2C communication protocol with
the following restrictions: the I/O pins SDA and SCL are mapped to are not “true” open-
drain. When configured as open-drain, the PMOS connected between the I/O pin and VDD is
disabled, but is still present.
The I2C characteristics are described in Table 56. Refer also to Section 6.3.14: I/O port
characteristics for more details on the input/output alternate function characteristics (SDA
and SCL).
Symbol
Table 56. I2C characteristics(1)
Parameter
Standard
Fast mode
Fast mode +
Unit
Min Max Min Max Min Max
fSCL
SCL clock frequency
0
100
0
tLOW Low period of the SCL clock
4.7
-
1.3
tHIGH High Period of the SCL clock
4
-
0.6
tr
Rise time of both SDA and SCL
signals
-
1000
-
400
0
1000 KHz
-
0.5
-
µs
-
0.26
-
µs
300
-
120
ns
tf
Fall time of both SDA and SCL
signals
-
300
-
300
-
120
ns
tHD;DAT
tVD;DAT
tVD;ACK
tSU;DAT
tHD;STA
Data hold time
Data valid time
Data valid acknowledge time
Data setup time
Hold time (repeated) START
condition
0
-
0
-
3.45(2)
-
-
3.45(2)
-
-
0.9(2)
0.9(2)
0
-
µs
-
0.45(2)
µs
-
0.45(2)
µs
250
-
100
-
50
-
ns
4.0
-
0.6
-
0.26
-
µs
tSU;STA
Set-up time for a repeated
START
condition
4.7
-
0.6
-
0.26
-
µs
tSU;STO Set-up time for STOP condition
4.0
-
0.6
-
0.26
-
µs
tBUF
Bus free time between a
STOP and START condition
4.7
-
1.3
-
0.5
-
µs
Cb
Capacitive load for each bus line
-
400
-
400
-
550
pF
1. The I2C characteristics are the requirements from the I2C bus specification rev03. They are guaranteed by
design when the I2Cx_TIMING register is correctly programmed (refer to reference manual). These
characteristics are not tested in production.
2. The maximum tHD;DAT could be 3.45 µs, 0.9 µs and 0.45 µs for standard mode, fast mode and fast mode
plus, but must be less than the maximum of tVD;DAT or tVD;ACK by a transition time.
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