Introduction to Digital Power Conversion
XMC4000/1000 Family
Sensing
Application Guide 46 V1.0, 2015-01
5 Sensing
The XMC analog input signal sensing front-end, with dedicated features for switch-mode power
control applications, covers:
VADC channels
Analog Voltage / Current measurements
Fast Compare mode features, using result compare registers and sticky Fast Compare Result
(FCR) Flags
Limit Checking / Out-of-Range Comparators (indicating Outside or Inside Valid-Band, with
Boundary Flags (BFL)
ACMP / CSG (Analog Comparator / Comparator and Slope Generator) with embedded 10-bit DAC
DSD ADC (Delta-Sigma De-modulator, Analog-to-Digital Converter)
Uses
Sensing is essential for the closed loop control of the converter transfer functions.
In the closed loop there are reference inputs values, by which the loop control gain forces error
deviations towards zero.
5.1 Analog Signal Sensing
5.1.1 Level Crossing Detection, Fast Compare mode
A VADC channel, in Fast Compare mode, may generate an interaction request via the associated
FCR flag on level crossing detection events, caused by the sensed signal. A reference result register
and two hysteresis boundary registers (0/1), define the level crossing range.
Typical Fast Compare mode use cases
Over Voltage Protection (OVP)
Over Current Protection (OCP)
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