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82 User Manual
I2C Trigger and Serial Decode
Three simple steps are necessary to trigger and decode the signals: “ Setup for I2C
Signals ”, “ I2C Triggering ” and “ I2C Decode ”.
Setup for I2C Signals
Setting the I2C (Inter-IC bus) signal includes two steps: connecting the serial data
signal (SDA) and serial clock signal (SCK) to the oscilloscope, specifying the threshold
voltage of each input signal.
1. Press Decode key to enter the DECODE function menu as Figure 38 shows.
Figure 38 I2C DECODE Menu
2. Press the Decode softkey and select the desired decoder (Decode1 or Decode2).
3. Press Protocol softkey and then select I2C by turning Universal Knob.
4. Press Signal softkey to enter the SIGNAL menu as Figure 39 shows.
Figure 39 I2C SIGNAL Menu
5. Set SCL (I2C’s clock signal):
a. Press SCL softkey to select the channel that is connected to the I2C clock signal.
b. Press Threshold softkey to set the I2C clock signal’s threshold voltage level
Using the Universal Knob. The threshold voltage level is required for decoding,
and it will be used as the trigger voltage level when setting the trigger type to
serial.
6. Set SDA (I2C’s data signal):
a. Press SDA to select the channel that is connected to the I2C data signal.
b. Press second Threshold softkey to set the I2C data signal’s threshold voltage
level using the Universal Knob. The threshold voltage level is for decoding,