TIDUEY6 April 2021
Resolver analog front end module deals with all the analog interface requirements of the resolver to work with MCUs. It has two main functions:
The module is designed using ALM2402F-Q1 and standard linear parts. ALM2402F-Q1 is a dual channel high power operational amplifier with integrated protection for resolver against current limit and over temperature. The module is shown in Figure 3-18.
It is mounted on control mother board headers J8, J9 and J10. All power and signals are flow through J9, while J10 provides EARTH access to noise signals picked by resolver cable. J8 provides mechanical support for the module. The module has a multiplexer CD4053B-Q1 that helps to cross feed the sine and cosine signals into ADC to verify signal and channel integrity to ensure safe estimation of rotor position. The module also interfaces with resolver thermistor and provides an analog signal representing resolver temperature for the MCUs to track.