NRF52810-QCAA-R datasheet(425/483 Pages) NORDIC

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Peripherals

6.23.9 Pullup resistor

R [kΩ]

cap [pF]

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

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

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NRF52810-QCAA-R Datasheet(PDF) 425 Page - Nordic Semiconductor

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