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4.Advanced User Guidebook
40
Holdoff
Normal
Acquire waveform when trigger occurred
Single
When trigger occurs, acquire one waveform
then stop
2. I2C Trigger
The I2C serial bus consists of SCL and SDA. The transmission rate is
determined by SCL, and the transmission data is determined by SDA. As
shown in below figure, oscilloscope can trigger on the start, restart, stop, ack
lost, specific device address or data value, also device address and data
value at the same time.
In I2C bus trigger mode, the trigger setting information is displayed on
bottom right of the screen, for example,
, indicates that
trigger type is I2C, CH1 trigger level is 0.00mV.
I2C Trigger menu list:
Menu
Setting
Instruction
Bus Type
I2C
Set vertical channel bus type as I2C
trigger.
Source
SCL
SDA
Set SCL.
Set SDA.
When
Start
Trigger when SDA data transitions from
high to low while SCL is high.
Restart
When another start condition occurs
before a stop condition.
Stop
Trigger when SDA data transitions from
low to high while SCL is high.
Ack Lost
Trigger when SDA data is high during
any acknowledgement of SCL clock
position.
Addr
Trigger on the read or write bit when the
preset address is met.
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