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RIGOL Chapter 5 To Trigger the Oscilloscope
5-34 DS8000-R User Guide
I2C Trigger (Option)
I2C is a 2-wire serial bus used to connect the microcontroller and its peripheral
device. It is a bus standard widely used in the microelectronic communication control
field.
The I2C serial bus consists of SCL and SDA. Its transmission rate is determined by
SCL, and its transmission data is determined by SDA, as shown in the figure below.
DS8000-R triggers on the start condition, restart, stop, missing acknowledgment,
specific device address, or data value. Besides, it can also trigger on the specific
device address and data values at the same time.
Figure 5-14 Schematic Diagram of I2C Protocol
Trigger Type:
Click Type to select "I2C". Then, the current trigger setting information is displayed
at the upper-right corner of the screen, as shown in the figure below.
Source Selection:
Click SCL and SDA to specify the signal sources of SCL and SDA respectively. They
can be set to CH1-CH4. For details, refer to descriptions in "Trigger Source". The
current trigger source is displayed at the upper-right corner of the screen.
Note: Only when we select the channel (that has been input with signals) as the
trigger source, can we obtain a stable trigger.
Trigger Condition:
Click When to select the desired trigger condition.
âš« Start: triggers when SDA data transitions from high level to low level while SCL is
high level.
âš« Stop: triggers when SDA data transitions from low level to high level while SCL is
high level.
âš« Restart: triggers when another start condition occurs before a stop condition.
âš« MissedAck: triggers when the SDA data is high level during any acknowledgment
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