When the SD pin is set to high, the FDC enters shutdown mode. Shutdown mode is the lowest power state. To exit shutdown mode, set the SD pin to low. Entering shutdown mode returns all registers to their default state.

While in shutdown mode, no conversions are performed. In addition, entering shutdown mode clears any error condition and deassert the INTB pin. While the device is in shutdown mode, is not possible to read to or write from the device via the I²C interface.