Serial Trigger and Decode
The oscilloscope provides I2C, SPI, UART, CAN and LIN serial trigger and decode. This chapter introduces the method
of triggering and decoding these serial signals in details.
7.1 I2C Trigger and Serial Decode
7.1.1 Setup for I2C Signals
To set the I2C (Inter-IC bus) signal rst, connect the serial data signal (SDA) and serial clock signal (SCK) to oscilloscope,
then specify the threshold voltage of each input signal.
1. Touch Decode key to enter the Decode menu.
2. Touch Decode and select the desired slot (Decode1 or Decode2).
3. Touch Protocol and then select I2C by turning the Universal Knob.
4. Touch Signal to enter the Signal menu.
5. Set the SCL (I2C’s clock signal):
• Touch SCL to select the channel that is connected to the I2C clock signal.
• Touch rst Threshold softkey, then use the Universal Knob to set the I2C clock signal’s threshold voltage level .
– The threshold voltage level is for decoding, and it will be regarded as the trigger voltage level when the trigger
type is set to serial.
6. Set SDA (I2C’s data signal):
• Touch SDA to select the channel that is connected to the I2C data signal.
• Touch second Threshold softkey, then use the Universal Knob to set the I2C clock signal’s threshold voltage level
.
– The threshold voltage level is for decoding, and it will be regarded as the trigger voltage level when the trigger
type is set to serial.
Note:
SDA should keep stable during the whole high clock cycle, otherwise it will be interpreted as a start or stop
condition (data transitioning while the clock is high)
7. Touch to return previous menu.
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