The Comparator Subsystem (CMPSS) consists of analog comparators and supporting components that are combined into a topology that is useful for power applications such as peak current mode control, switched-mode power, power factor correction, and voltage trip monitoring. The comparator subsystem is built around a pair of analog comparators and helps detection of signal exception conditions including High/Low thresholds. The positive input of the comparator is always driven from an external pin, but the negative input can be driven by either an external pin or by an internal programmable 12-bit DAC. Each comparator output passes through a programmable digital filter that can remove spurious trip signals. A ramp generator circuit is optionally available to control the internal DAC value for one comparator in the subsystem.

The following tests can be applied as diagnostics for this module (to provide diagnostic coverage on a specific function):

• Software Test of Function Including Error Tests
• Software Read Back of Written Configuration
• Periodic Software Read Back of Static Configuration Registers
• Lock Mechanism for Control Registers
• VDAC Conversion by ADC
• CMPSS Ramp Generator Functionality Check
• Hardware Redundancy