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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32MP157C датащи(PDF) 218 Page - STMicroelectronics |
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STM32MP157C датащи(HTML) 218 Page - STMicroelectronics |
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218 / 258 page  Electrical characteristics STM32MP157C 218/258 DS12505 Rev 2 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 is 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) = 0.8473 × Rp × Cload Rp(min) = (VDD-VOL(max))/IOL(max) Where Rp is the I2C lines pull-up. Refer to Section 6.3.17: I/O port characteristics for the I2C I/Os characteristics. All I2C SDA and SCL I/Os embed an analog filter. Refer to Table 98 for the analog filter characteristics: The I2C pins can be set in FM+ mode in SYSCFG_PMCR register. Unless otherwise specified, the parameters given in Table 55 are derived from tests performed under the ambient temperature and VDD supply voltage conditions summarized in Table 13: General operating conditions. Table 97. 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 filter ON DNF=0 8 Analog filter OFF DNF=1 9 Fast-mode Plus Analog filter ON DNF=0 19 Analog filter OFF DNF=1 16 Table 98. I2C analog filter characteristics(1) 1. Guaranteed by design. Symbol Parameter Min Max Unit tAF Maximum pulse width of spikes that are suppressed by the analog filter 40(2) 2. Spikes with widths below tAF(min) are filtered. 260(3) 3. Spikes with widths above tAF(max) are not filtered. ns |
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