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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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NRF52810-QFAA-R 데이터시트(PDF) 425 Page - Nordic Semiconductor |
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NRF52810-QFAA-R 데이터시트(HTML) 425 Page - Nordic Semiconductor |
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425 / 483 page  Peripherals 6.23.9 Pullup resistor R [kΩ] 30 25 20 15 10 5 0 cap [pF] 0 100 200 300 400 500 400 kbps 100 kbps Figure 113: Recommended TWIM pullup value vs. line capacitance • The I2C specification allows a line capacitance of 400 pF at most. • The value of internal pullup resistor (RPU) for nRF52810 can be found in GPIO — General purpose input/output on page 137. 6.24 TWIS — I2C compatible two-wire interface slave with EasyDMA TWI slave with EasyDMA (TWIS) is compatible with I2C operating at 100 kHz and 400 kHz. The TWI transmitter and receiver implement EasyDMA. TXD (signal) PSELSDA PSELSCK PSELSDA RXD (signal) WRITE SUSPEND RESUME RAM EasyDMA EasyDMA RXD.PTR TXD.PTR RXD+2 RXD+n RXD+1 RXD TXD+2 TXD+n TXD+1 TXD READ STOPPED PREPARETX PREPARERX Figure 114: TWI slave with EasyDMA A typical TWI setup consists of one master and one or more slaves. For an example, see A typical TWI setup comprising one master and three slaves on page 426. TWIS is only able to operate with a single master on the TWI bus. 4430_161 v1.0 425 |
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