29.5.3 Sampling at Multiple Rates

Figure 29-12 shows an application example of sampling an ADC input at a fast rate (1x rate), a second analog input at a slower rate (1/2 rate) and four other inputs at a 1/8 rate. The example is a motor control application using a Silicon Controlled Rectifier (SCR) that triggers at a specified time after the AC line zero-crossing.

While this example uses the simple binary sampling ratios, the PTG module can generate a very wide range of sample ratios to meet the requirements of an application. This example demonstrates coordination between the PTG, ADC, PWM and PPS in order to achieve the required sampling rates.