OP-SB85 TTL/I2C/SPI Expansion Kit

[ Discontinued ]
The successor is OP-SB85L.


This expansion kit supports I2C clock synchronous communications and SPI communications used between LSI chips on printed circuit boards (PCB) besides HDLC communications and UART asynchronous communications at 3- and 5-V TTL signal levels.
The kit incorporates a high-speed analog signal measurement function operating at a maximum of 40M samples per second, which is ideal for the analog waveform analysis of communications signals.

Operating Instructions

Operating Instructions
After inserting the expansion board into an analyzer (LE-8200A/LE-8200), the communications line you want to measure is connected using the included probe pod. Since nine kinds of the signal lines can be tested, you can measure various communications: SD, RD, RS, CS, SD_CLK, RD_CLK, external input, trigger input and trigger output. Moreover, you can set the polarity of data and the clock you wish to capture.

Monitor function

Normal mode (USART) allows to use all functions such as trigger function. BURST mode allows to measure clock SYNC which is not supported in former models. (Clock SYNC: clock is given only when transmitting data.) I2C mode allows to measure I2C serial communications with start/ stop sequence. I2C and SPI communication can be displayed in translation display and it is possible to analysis read and write sequence.
The timing of clock and data set at “CPOL” and “CPHA” is described in above figure.

The relation of input data and address is as follows.
e.g.) Input “123”;
[If 7 bit] “0010001” is set.
[If 10 bit] “0100100011” is set.
[ I2C Monitor ]
[ SPI Monitor ]
Display Meaning
It displays the time of receiving data./
It displays the difference of time. (Switchable by pressing [F5])
Indicates the transmission (write) from Master.
Indicates the reception (read) from Master.
Indicate the slave address and data in HEX.
[01] Indicates the non-acknowledge.
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.

Analog Waveform Analysis

It displays the waveforms at a sampling rate up to 40M for 2 channels and supports ±12V. This function helps to identify hardware problems. You can also use it for educational purpose for people studying data communications.

Simulation / Bert

Excepting the BURST mode, using the simulation function enables you to vastly enhance the efficiency of the development and the trouble analysis. 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.


Interface TTL, I2C, SPI (connected with test clips)
Input impedance 100K Ohm
Input Level Threshold High: 2.2 V min.
Low: 0.9 V max.
(Maximum input: (-1V ~ +7V)
Output Level Voltage High: 3.0 V, 4.5 V, without pull-up
Low: 0.5 V max.
Probe Signal SD (SDA/SDO), RD (SDI), RTS (SS), CTS, EXIN, TXC (SCL/SCK), RXC, TRG.IN,TRG.OUT(Lead length: 170 mm)
Expansion protocol I2C, SPI, Burst (*1)
Communications test function Monitor/Simulation/BERT (*2)
Speed (I2C Test) 100Kbps, 400Kbps, 1Mbps
Speed (SPI test) 10 Mbps max.
Analog waveform analysis The signal voltages of 2 channels are measured and displayed in analog waveform
Sampling: 1 MHz to 40MHz (in 6 steps), 4K points
Measurement range: ±6 V/±12 V
Composition Dedicated expansion board, relay cable, high-speed TTL probe pod, 3-wire probe cable
*1: Mode for sampling data at all clock edges.
*2: No I2C, SPI, or Burst BERT testing supported.