TTL/I2C/SPI Expansion Kit
(For LE-3500R/LE-2500R)



OP-SB5GL is the interface expansion kit that has a port to measure RS-232C(V.24) and a port to measure the TTL / CMOS signal level communications. The port for TTL / CMOS supports the measurement of TTL / CMOS level communications that power supply system is from 1.8V to 5V. It is suitable for monitoring the communications between the LSI and the interface IC on the printed circuit board by directly probing into the lines. It supports the protocol of not only UART and HDLC but also I2C and SPI on monitoring and simulating.

*With LE-1500R/LE-2500/LE-1500 it does not support SPI.
* With LE-1500R/LE-1500 it does not support I2C.
(1) RS-232C (V.24) Measurement Port
RS-232C port, which is same as the one on the standard board.
(2) External Signal Input/Output Terminal
Output/input the external trigger signal.
(3) TTL/C-MOS Expansion Connector
Connect the TTL probe pod.
[ Internal block ]
[ I2C mesuament ]
[ Quality Test Clip ]

Operating Instructions

After inserting the expansion board into the analyzer, clip the communication line you want to measure using the attached probe pod.
SD, RD, RTS, CTS, EXIN (external signal input), TXC (SD_CLK), RXC (RD_CLK), TRG.IN (external trigger input), and TRG.OT (external trigger output) signal lines can be monitored. It also supports communication with external clock of TTL level. You can also set the polarity of the data and the polarity of the clock to be fetched.


In the normal mode (USART), you can make full use of the functions of an analyzer such as the trigger function. Also, by setting the BURST mode on the analyzer, you can measure communication system (clock synchronous communication) which supplies the clock at the time of only transmitting data. That makes it possible to monitor communication that the old protocol analyzers cannot measure.

Example of Clock Synchrounaous Communication


By setting the I2C mode, you can test the I2C serial communications including the start sequence and stop sequence. Since the translation display is available in I2C, you can efficiently analyze the sequences of Read and Write.

< I2C Measuring Result Screen >

< I2C Translation Screen >

By using LE-3500, it can monitor SPI communications, which is widely used in transferring communications. Refer to the SPI additional specificationfor details.

< SPI Measuring Result Screen >

< SPI Frame Display Screen >

The timing of clock and data set at "CPOL" and "CPHA" is described in above figure.

Display Meaning
It displays the time of receiving data./
It displays the difference of time. (Switchable by pressing [F5])
Data It displays data in HEX.

Logic Analyzer

By using the logic analyzer function, you can check the data logic and the timing of capturing the clock in the waveform. Especially, the serial interface between LSI often can be a problem regarding the phase difference and the delay of the clock and data. In this case, the logic analyzer function enables you to analyze by bit timing.

< I2C wave mesuament >

Simulation / BERT

Excepting the BURST mode, using the simulation function enables you to enhance the efficiency of product development and the troubleshooting. In the I2C and SPI mode, you can simulate in both the master and the slave. Also, since the bit error rate test (BERT) is available in the normal mode (USART), you can easily test the transmission feature of the device, etc.