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STM32F373VC 数据表(PDF) 91 Page - STMicroelectronics |
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STM32F373VC 数据表(HTML) 91 Page - STMicroelectronics |
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91 / 131 page  DocID022691 Rev 4 91/131 STM32F37xxx Electrical characteristics 114 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). Table 56. I2C characteristics(1) Symbol Parameter Standard Fast mode Fast mode + Unit Min Max Min Max Min Max fSCL SCL clock frequency 0 100 0 400 0 1000 KHz tLOW Low period of the SCL clock 4.7 - 1.3 - 0.5 - µs tHIGH High Period of the SCL clock 4 - 0.6 - 0.26 - µs tr Rise time of both SDA and SCL signals - 1000 - 300 - 120 ns tf Fall time of both SDA and SCL signals - 300 - 300 - 120 ns tHD;DAT Data hold time 0 - 0 - 0 - µs tVD;DAT Data valid time - 3.45(2) -0.9(2) -0.45(2) µs tVD;ACK Data valid acknowledge time - 3.45(2) -0.9(2) -0.45(2) µs tSU;DAT Data setup time 250 - 100 - 50 - ns tHD;STA Hold time (repeated) START condition 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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