SM5908 datasheet by STMicroelectronics

SM5908 Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the SM5908?
  The recommended operating voltage range for the SM5908 is 2.7V to 5.5V, with a typical voltage of 3.3V.
• How do I configure the SM5908 for I2C or SPI mode?
  The SM5908 can be configured for I2C or SPI mode by setting the MODE pin high or low, respectively. For I2C mode, connect the MODE pin to VCC, and for SPI mode, connect it to GND.
• What is the maximum clock frequency supported by the SM5908?
  The maximum clock frequency supported by the SM5908 is 10 MHz for I2C mode and 20 MHz for SPI mode.
• How do I handle the SM5908's power-on reset (POR) and brown-out reset (BOR) features?
  The SM5908 has an internal POR and BOR circuitry. The POR is triggered when the supply voltage falls below 1.9V, and the BOR is triggered when the supply voltage falls below 2.2V. Ensure that your design takes these features into account to prevent unexpected resets.
• What is the purpose of the SM5908's internal oscillator, and how do I use it?
  The SM5908 has an internal oscillator that can be used as a clock source. To use it, connect the XIN pin to a capacitor (typically 10nF) and the XOUT pin to GND. The internal oscillator frequency is approximately 2.2 MHz.