Low-Power Mode

For low-power applications, the OPAMP module contains settings for power saving. One of them is to tradeoff speed versus power efficiency to get the lowest power consumption. The speed setting is configured for each amplifier individually by the Bias Control field in the Operational Amplifier x Control register (OPAMPCTRLx.BIAS). The BIAS bits select the amount of bias current provided to the operational amplifiers. This will also affect the start-up time. Another low-power configuration is to disable the voltage doubler by setting the Low-Power Mux bit in the Control Register (CTRLA.LPMUX), if the supply voltage is guaranteed to be above 2.5V. Disabling the voltage doubler saves power and reduces the start-up time.