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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P16F877 датащи(PDF) 96 Page - Microchip Technology |
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P16F877 датащи(HTML) 96 Page - Microchip Technology |
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96 / 218 page  PIC16F87X DS30292C-page 94 2001 Microchip Technology Inc. 9.3 Connection Considerations for I2C Bus For standard-mode I2C bus devices, the values of resistors Rp and Rs in Figure 9-27 depend on the fol- lowing parameters: • Supply voltage • Bus capacitance • Number of connected devices (input current + leakage current) The supply voltage limits the minimum value of resistor Rp, due to the specified minimum sink current of 3 mA at VOL max = 0.4V, for the specified output stages. For example, with a supply voltage of VDD = 5V±10% and VOL max = 0.4V at 3 mA, Rp min = (5.5-0.4)/0.003 = 1.7 kΩ. VDD as a function of Rp is shown in Figure 9-27. The desired noise margin of 0.1VDD for the low level limits the maximum value of Rs. Series resistors are optional and used to improve ESD susceptibility. The bus capacitance is the total capacitance of wire, connections, and pins. This capacitance limits the max- imum value of Rp due to the specified rise time (Figure 9-27). The SMP bit is the slew rate control enabled bit. This bit is in the SSPSTAT register, and controls the slew rate of the I/O pins when in I2C mode (master or slave). FIGURE 9-27: SAMPLE DEVICE CONFIGURATION FOR I2C BUS Rp Rp VDD + 10% SDA SCL DEVICE Cb=10 - 400 pF Rs Rs Note: I2C devices with input levels related to VDD must have one common supply line to which the pull-up resistor is also connected. |
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