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 first, 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 first
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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