Other Parts Discussed in Thread: , PCA9534
what is different for TCA9534/TCA9534A/PCA9534?
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The TCA9534 is an enhanced version of the PCA9534 with an extended supply voltage range (1.65v min vs. 2.3v min) and performance enhancements related to Power-On Reset.
The TCA9534 and TCA9534A have different static addresses. This allows for up to 16 devices on the same I2C bus (8 of each).
A Device Comparison Table can be found in section 5 of the PCA9534 data sheet.