SPRSP14E may 2019 – june 2023 TMS320F28384D , TMS320F28384D-Q1 , TMS320F28384S , TMS320F28384S-Q1 , TMS320F28386D , TMS320F28386D-Q1 , TMS320F28386S , TMS320F28386S-Q1 , TMS320F28388D , TMS320F28388S
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
The PMM has voltage monitors on both the VDDIO and VDD supply rails that release the XRSn signal high once the supply voltages cross the set thresholds during power up. The role of the PMM on this device is to ensure that IO pins are glitch free during power up and XRSn is held active low during this time. If the minimum rising slew rates are met, then XRSn will be held until the device has proper voltage levels to meet the device's electrical specifications.
However, the detection limits of the PMM are below the minimum operational ranges for the device. If the rising slew rate is not met, XRSn will be released before the supply rails are within specification. Likewise if there is a droop on either of the voltage lines the PMM may not detect an out of range event depending on where the supply voltage settle. As such, an external voltage supervisor is required to monitor the device voltage rails and release reset to the device for these conditions.
Two voltage monitors (I/O POR,VDD POR) both have to detect that their input voltage levels are greater than their respective release thresholds before the PMM will release the drive on the XRSn pin(active low, open-drain input). If the voltage on either supply pin falls below the release point XRSn will be driven low by the device. The I/Os are held in a high impedance state when either of the voltage monitors trip.