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Texas Instruments TCA9536EVM Evaluation Board is designed w.ith options to test both the TCA9536 and TCA9537 I/O expanders. This evaluation module allows for adjustable pull-up resistors on SDA/SCL as well as LED indicators on power-up and the GPOs. The TCA9536EVM board features a separate power rail for LEDs and adjustable pull-up resistors on I2C bus.