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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7265X датащи(PDF) 152 Page - STMicroelectronics |
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ST7265X датащи(HTML) 152 Page - STMicroelectronics |
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152 / 166 page  ST7265x 152/166 COMMUNICATION INTERFACE CHARACTERISTICS (Cont’d) 13.11.3 I2C - Inter IC Control Interface 1) The device must internally provide a hold time of at least 300 ns for the SDA signal in order to bridge the undefined region of the falling edge of SCL 2) The maximum hold time of the START condition has only to be met if the interface does not stretch the low period of SCL signal Cb = total capacitance of one bus line in pF I 2C-Bus Timings Parameter Standard I 2C Fast I 2C Symbol Unit Min Max Min Max Bus free time between a STOP and START con- dition 4.7 1.3 TBUF ms Hold time START condition. After this period, the first clock pulse is generated 4.0 0.6 THD:STA µs LOW period of the SCL clock 4.7 1.3 TLOW µs HIGH period of the SCL clock 4.0 0.6 THIGH µs Set-up time for a repeated START condition 4.7 0.6 TSU:STA µs Data hold time 0 (1) 0 (1) 0.9(2) THD:DAT ns Data set-up time 250 100 TSU:DAT ns Rise time of both SDA and SCL signals 1000 20+0.1Cb 300 TR ns Fall time of both SDA and SCL signals 300 20+0.1Cb 300 TF ns Set-up time for STOP condition 4.0 0.6 TSU:STO ns Capacitive load for each bus line 400 400 Cb pF |
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