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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST7263BDX датащи(PDF) 125 Page - STMicroelectronics |
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ST7263BDX датащи(HTML) 125 Page - STMicroelectronics |
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125 / 145 page  ST7263BDx ST7263BHx ST7263BKx ST7263BE 125/145 Communication interface characteristics (Cont’d) Figure 73. Typical application with I2C Bus and timing diagram 1) Note: 1. Measurement points are done at CMOS levels: 0.3xVDD and 0.7xVDD. The following table gives the values to be written in the I2CCCR register to obtain the required I2C SCL line frequency . Table 28. SCL frequency table Legend: RP = External pull-up resistance fSCL = I 2C speed NA = Not achievable Notes: – For speeds around 200 kHz, achieved speed can have ±5% tolerance – For other speed ranges, achieved speed can have ±2% tolerance The above variations depend on the accuracy of the external components used. REPEATED START START STOP START tf(SDA) tr(SDA) tsu(SDA) th(SDA) tf(SCK) tr(SCK) tw(SCKL) tw(SCKH) th(STA) tsu(STO) tsu(STA) tw(STO:STA) SDA SCK 4.7k Ω SDAI ST72XXX SCLI VDD 100 Ω 100 Ω VDD 4.7k Ω I2CBUS fSCL (kHz) I2CCCR value fCPU=4 MHz. fCPU=8 MHz. VDD = 4.1 V VDD = 5 V VDD = 4.1 V VDD = 5 V RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ RP=3.3kΩ RP=4.7kΩ 400 NA NA NA NA 83h 83 83h 83h 300 NA NA NA NA 85h 85h 85h 85h 200 83h 83h 83h 83h 8Ah 89h 8Ah 8Ah 100 10h 10h 10h 10h 24h 23h 24h 23h 50 24h 24h 24h 24h 4Ch 4Ch 4Ch 4Ch 20 5Fh 5Fh 5Fh 5Fh FFh FFh FFh FFh |
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