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SIGLENT
SDS2000X User Manual 81
IIC Triggering
This part introduces the nine kinds of trigger conditions (Start, Stop, Restart, No Ack,
EEPROM, 7 Addr&Data, 10 Addr&Data and Data Length) and the methods of setting
them.
To introduce the trigger conditions
Start Condition— The oscilloscope will be triggered when the SDA signal
transitions from high to low while the SCL clock is high. If it is chosen as the
condition of trigger (including frame triggers), a restart will be treated as a “Start
condition”.
Stop Condition— The oscilloscope will be triggered when the SDA transitions
from low to high while the SCL is high.
Restart— The oscilloscope will be triggered when another “Start condition”
occurs before a "Stop condition”.
No Ack— The oscilloscope will be triggered when SDA data is high during any
SCL’s ACK bit.
EEPROM — The trigger searches for an EEPROM control byte (the value is
1010xxx) on the SDA bus, there is a Read bit, and an ACK bit behind EEPROM.
Use the Limit Range softkey to set the qualifier and Data1 softkey to set the
data’s value. If the EEPROM’s data is greater(less than, or equal) than Data1, the
oscilloscope will be triggered at the edge of ACK bit behind the Data byte. It’s no
necessary that the Data byte must follow the EEPROM.
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