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NRF52820-QDAA-R Datasheet(PDF) 287 Page - Nordic Semiconductor

Part # NRF52820-QDAA-R
Description  nRF52820
PDF  437 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52820-QDAA-R Datasheet(HTML) 287 Page - Nordic Semiconductor

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Peripherals
6.20 TWI — I2C compatible two-wire interface
The TWI master is compatible with I2C operating at 100 kHz and 400 kHz.
TXD
(signal)
RXD
TXD
PSEL.SDA
PSEL.SCL
PSEL.SDA
RXD
(signal)
ERROR
STOP
STARTTX
STARTRX
STOPPED
RXDRDY
TXDSENT
BB
SUSPEND
RESUME
SUSPENDED
Figure 106: TWI master's main features
6.20.1 Functional description
This TWI master is not compatible with CBUS. The TWI transmitter and receiver are single buffered.
See TWI master's main features on page 287.
A TWI setup with one master and three slaves is shown in the following figure. This TWI master is only
able to operate as the only master on the TWI bus.
TWI master
TWI slave
(Sensor)
Address = b1011000
TWI slave
Address = b1011011
SCL
SCL
TWI slave
(EEPROM)
Address = b1011001
SCL
R
VDD
R
VDD
SDA
SDA
SDA
SCL
SDA
Figure 107: A typical TWI setup with one master and three slaves
This TWI master supports clock stretching performed by the slaves. The TWI master is started by triggering
the STARTTX or STARTRX tasks, and stopped by triggering the STOP task.
If a NACK is clocked in from the slave, the TWI master will generate an ERROR event.
6.20.2 Master mode pin configuration
The different signals SCL and SDA associated with the TWI master are mapped to physical pins according to
the configuration specified in the PSEL.SCL and PSEL.SDA registers respectively.
If the CONNECT field of a PSEL.xxx register is set to Disconnected, the associated TWI signal is not
connected to any physical pin. The PSEL.SCL and PSEL.SDA registers and their configurations are only used
as long as the TWI master is enabled, and retained only as long as the device is in ON mode. PSEL.SCL and
PSEL.SDA must only be configured when TWI is disabled.
4463_156 v1.0
287



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