HT42B532-x Datasheet, Holtek Semiconductor

* Operating Voltage (VDD): 3.3V~5.5V
* I2C pins Voltage (VDDIO): 1.8V~VDD (Less than VDD voltage)
* Fully integrated internal 12MHz oscillator with 0.25% a.

strings
*
* Integrated an internal 1.5kΩ pull-high resistor on D+ pin
* Serial Interface
  – I2C
*
* Supports clock rate up to 400kHz
*
* Supports Master and Slave modes decided by AP command
*
* Support.