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Chapter 5 To Trigger the Oscilloscope RIGOL
MSO2000A/DS2000A User’s Guide 5-41
I 2C Trigger
I2C is a 2-wire serial bus used to connect the microcontroller and its peripheral
device and is a bus standard widely used in the microelectronic communication
control field.
The I 2C serial bus consists of SCL and SDA. I ts transmission rate is determined by
SCL and its transmission data is determined by SDA, as shown in the f igure below.
MSO2000A/DS2000A triggers on start condition, restart condition, stop condition,
missing acknowledgement, specific device address or data value. Besides, it can also
trigger on the specific device address and data value at the same time.
Figure 5-14 I 2C Tr igg er
Trigger Type:
Press Type to open the trigger type list. Rotate and press down to select
“I2C”. At this point, the trigger setting information as shown in the figure below is
displayed at the upper right corner of the screen. For example,
.
The trigger type is I2C trigger; the trigger source is CH1; the trigger level is 0.00 V.
Source Selection:
Press SCL and SDA to specify the signal sources of SCL and SDA respectively. They
can be set to CH1, CH2 or any channel of D0-D15. For the details, please refer to the
introduction in “
Trigger Source”. The current trigger source is displayed at the
upper right corner of the screen.
Note: Select channel with signal input as trigger source to obtain stable trigger.
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