ZHCSMR1C october 2019 – september 2021 UCC5870-Q1
PRODUCTION DATA
The device also provides an analog feedback functionality for the ADC for applications that do not want to maintain continuous SPI communication. When enabled, the DOUT output provides a PWM signal with a duty cycle proportional to the signal that is selected to be monitored. Any of the AI* inputs and the TJ are available for monitoring on the DOUT output. As there is only one DOUT output, only one channel is selectable. Typically, DOUT is either directly monitored by the MCU, or run through an RC filter to convert it to an analog voltage that may be digitized and monitored by the host controller.
In order to use the DOUT function, the nFLT2 pin must be reconfigured to select the DOUT functionality using the CFG1[NFLT2_DOUT_MUX] bit (CFG1). When the DOUT mode is selected, any warning or fault that was selected to report to nFLT2 now reports to nFLT1 automatically. Additionally, the frequency of DOUT is selectable between 4 options using the DOUTCFG[FREQ_DOUT] bits (DOUTCFG). Select the channel to be monitored, using the DOUTCFG[DOUT_TO_AI*] bits (for the AI* inputs, DOUTCFG) or the DOUTCFG[DOUT_TO_TJ] bit (DOUTCFG) for the die junction temperature. If multiple channels are selected in the register, the duty cycle constantly changes as the ADC cycles through each channel read. It is recommended to only select one channel at a time for the DOUT function. In addition to this setup, the ADC must be enabled and setup correctly to read the desired channel to be monitored. See the ADC section for details on configuring the ADC. If a fault occurs that stops the driver output and ADC measurements, the DOUT output continues and represents the last good ADC reading.