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STM32H723VG Datasheet(PDF) 189 Page - STMicroelectronics |
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STM32H723VG Datasheet(HTML) 189 Page - STMicroelectronics |
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189 / 227 page  DS13313 Rev 2 189/227 STM32H723xE/G Electrical characteristics 208 6.3.37 Communication interfaces I2C interface characteristics The I2C interface meets the timings requirements of the I2C-bus specification and user manual revision 03 for: • Standard-mode (Sm): with a bit rate up to 100 kbit/s • Fast-mode (Fm): with a bit rate up to 400 kbit/s • Fast-mode Plus (Fm+): with a bit rate up to 1 Mbit/s. The I2C timings requirements are guaranteed by design when the I2C peripheral is properly configured (refer to RM0399 reference manual) and when the i2c_ker_ck frequency is greater than the minimum shown in the table below: The SDA and SCL I/O requirements are met with the following restrictions: • The SDA and SCL I/O pins are not “true” open-drain. When configured as open-drain, the PMOS connected between the I/O pin and VDD is disabled, but still present. • The 20 mA output drive requirement in Fast-mode Plus is not supported. This limits the maximum load CLoad supported in Fm+, which is given by these formulas: tr(SDA/SCL)=0.8473xRP * CLoad RP(min)= (VDD-VOL(max))/IOL(max) Where RP is the I2C lines pull-up. Refer to Section 6.3.16: I/O port characteristics for the I2C I/Os characteristics. All I2C SDA and SCL I/Os embed an analog filter. Refer to the table below for the analog fil- ter characteristics: Table 104. Minimum i2c_ker_ck frequency in all I2C modes Symbol Parameter Condition Min Unit f(I2CCLK) I2CCLK frequency Standard-mode - 2 MHz Fast-mode Analog Filtre ON DNF=0 8 Analog Filtre OFF DNF=1 9 Fast-mode Plus Analog Filtre ON DNF=0 17 Analog Filtre OFF DNF=1 16 - Table 105. I2C analog filter characteristics(1) 1. Guaranteed by characterization results. Symbol Parameter Min Max Unit tAF Maximum pulse width of spikes that are suppressed by analog filter 50(2) 2. Spikes with widths below tAF(min) are filtered. 80(3) ns |
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