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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SW52212 датащи(PDF) 24 Page - Silicon Laboratories |
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SW52212 датащи(HTML) 24 Page - Silicon Laboratories |
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24 / 71 page  5.10 OEb Deassertion The OEb function is deasserted by pulling high or writing the I2C OE bit to a logic low. The corresponding output is stopped cleanly and the final output state is driven low. 5.11 FS Pin The FS pin will select 0 = 100 MHz, mid = 200 MHz, and 1 = 133 MHz. This is a tri-state pin, which has a weak internal pull-down of approximately 100 kΩ. The default output frequency is 100 MHz. 5.12 SS_EN Pin The SS_EN pin will select 0 = –0.25% spread, mid = Spread is off, and 1 = –0.5% spread. This is a tri-state pin, which has a weak internal pull-up of approximately 100 kΩ. The default is –0.5% spread. 5.13 Recommendations for Driving Tri-State Pins VDD R1 R2 Si522xx Tri-State Pin (FS/SS_EN) 1 KΩ 1 KΩ Static Option User can remove either R1, R2, or neither to constantly maintain low, high, or mid levels respectively VDD 1 KΩ 1 KΩ Tri-State Dynamic Option User can use a MCU with strong Tri-State outputs to drive the Tri-State input pin. 1 KΩ resistors should be adequate for most MCU drivers. 3-Level Dynamic Option A MCU with 3-level output capability can be directly connected to the Tri- State input pin to drive it either low, high, or mid level. MCU With Tri-State Outputs (0, High Z and VDD) MCU With Tri-State Outputs (0, VDD/2 and VDD) Si522xx Tri-State Pin (FS/SS_EN) Si522xx Tri-State Pin (FS/SS_EN) Figure 5.7. Tri-State Pin Schematics Data Sheet Functional Description silabs.com | Building a more connected world. Rev. 1.0 | 24 |
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