NRF52820-QDAA-R datasheet(323/437 Pages) NORDIC

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Peripherals

Figure 119: TWIM timing diagram, 1 byte transaction

6.22.9 Pullup resistor

R [kΩ]

cap [pF]

100

200

300

400

500

400 kbps

100 kbps

Figure 120: 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 nRF52820 can be found in GPIO — General purpose

input/output on page 127.

6.23 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)

PSEL.SDA

PSEL.SCK

PSEL.SDA

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 121: TWI slave with EasyDMA

4463_156 v1.0

323

NRF52820-QDAA-R Datasheet(PDF) 323 Page - Nordic Semiconductor

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