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Protocol analysis
R&S
®
MXO 5 Series
309User Manual 1802.3369.02 ─ 02
1,-2.816e-05,-2.802e-05,CAh,F0h
2,-2.802e-05,-2.788e-05,05h,0Dh
13.3 I²C (option R&S MXO5-K510)
The Inter-Integrated Circuit is a simple, low-bandwidth, low-speed protocol used for
communication between on-board devices, for example, in LCD and LED drivers,
RAM, EEPROM, and others.
Required options and equipment
For performing I²C decode measurements, you need the following equipment:
●
R&S MXO 5 with 2 available channels. The channels can be a combination of the
following:
– Analog channels (C1-C4)
– Logic channels (D0-D15) (requires option R&S MXO5-B1)
●
Option R&S MXO5-K510
● About the I²C protocol........................................................................................... 309
● I²C configuration....................................................................................................311
● I2C filter.................................................................................................................314
● I²C trigger settings.................................................................................................316
● I²C decode results.................................................................................................320
● Performing I2C decoding...................................................................................... 322
13.3.1 About the I²C protocol
This chapter provides an overview of protocol characteristics, data format, address
types and trigger possibilities. For detailed information, read the "I2C-bus specification
and user manual" available on the NXP manuals webpage at http://www.nxp.com/.
I²C characteristics
Main characteristics of I²C are:
●
Two-wire design: serial clock (SCL) and serial data (SDA) lines
●
Controller/ target communication: the controller generates the clock and addresses
the targets. Targets receive the address and the clock. Both controller and targets
can transmit and receive data.
●
Addressing scheme: each target device is addressable by a unique address. Multi-
ple target devices can be linked together and can be addressed by the same con-
troller.
●
Read/write bit: specifies if the controller reads (=1) or writes (=0) the data.
●
Acknowledge: takes place after every byte. The receiver of the address or data
sends the acknowledge bit to the transmitter.
I²C (option R&S
MXO5-K510)
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