Operational Amplifier Version 1.0
Chapter 3 Operations of Operational Amplifier
3 Operations of Operational Amplifier
The operational amplifier can be activated by setting the PD bit in the OPCR register using the software. It can operate in closed loop mode or open loop mode, depending on the settings of the RES2, RES1 and RES0 bits in the OPCR register.
■Activating Operational Amplifier by Software
The settings shown in Figure
Figure 3 Settings for Activating Operational Amplifier
After the bits in the OPCR register are set as shown above, the operational amplifier will not start operating until it stabilizes.
■Operations of OPAMP in Closed Loop Mode
Before being activated, the operational amplifier can be set to operate in closed loop mode in advance by setting RES[2:0] in the OPCR register to "000B", "001B", "010B", "011B", "100B" or "101B".
Six different closed loop gains are available to be used in closed loop mode. Select a desired closed loop gain by setting RES[2:0] in OPCR to the value corresponding to that gain.
■Operations of OPAMP in Open Loop Mode
Before being activated, the operational amplifier can be set to operate in open loop mode in advance by setting RES [2:0] in the OPCR register to "110B".
