Minimizing Shutdown Current in the MAX9877 Audio Subsystem IC

The MAX9877 audio subsystem IC was designed with the knowledge that any devices connected to an I²C bus expect both the SDA and SCL lines to idle in a logic-high state. Therefore, this device achieves the minimum shutdown supply current by relying upon the logic-high state at both SDA and SCL. This application note describes three methods for achieving minimum shutdown current in systems where SDA and SCL must be set to a logic-low when the MAX9877 is placed in shutdown.