User Manual 9. Press the Holdoff softkey and turn V0 to set the time that the oscilloscope waits before a trigger to the next trigger, so that complex waveforms are displayed stably. 2.7.14. IIC Trigger IIC (Inter-IC bus) signals setup consists of connecting the oscilloscope to the serial data (SDA) line and the serial clock (SCL) line and then specifying the input signal threshold voltage levels. To set up the oscilloscope to capture IIC signals, please refer to the following: 1. Press the [Trig Menu] button on the front panel to enter the Trigger system function menu. 2. Press the Type softkey, then turn the Multifunctional Knob to select IIC and push down the knob to confirm. 3.
Source Selection: Press SCL and SDA softkey, turn the Multifunctional Knob to to specify the data sources of SCL and SDA respectively. They can be set to CH1-CH2. 4. Press When softkey to set trigger condition. Select trigger condition “Start Bit”, connect the SCL signal to CH1 and connect the SDA signal to CH2. Press the corresponding Level softkey; then, turn the Trigger Level knob to set the signal threshold voltage level. Data must be stable during the entire high clock cycle or it will be interpreted as a start or stop condition (data transitioning while the clock is high). Trigger Condition : Press When softkey to select the desired trigger condition. Start :
trigger when SDA data transitions from high level to low level while SCL is high level. Stop : trigger when SDA data transitions from low level to high level while SCL is high level. No Ack : trigger when the SDA data is high level during any acknowledgement of SCL clock position. Address : the trigger searches for the specified address value. When this event occurs, the oscilloscope will trigger on the read/write bit. The AddrBits is "7 bits"; so the range can be from 0 to 0x7F. Restart : trigger when another start condition occurs before a stop condition. Address and Data : the trigger searches for the specified address and data value on the data line (SDA).
When this event occurs, the oscilloscope will trigger on the clock line (SCL) transition edge of the last bit of data. After this trigger condition is selected: a. Press Data software, use V0 to set the data, refer to 2.7.10 ; b. Data Mask: When set to "ON", the data is ignored when it is triggered; the setting is "OFF", and the data on the data line must be consistent with the data of the index so that it can trigger; c. Data Index : The range is 0 to 3. It can set four hexadecimal data. 33 / 67