Part Number: TMS320F28062F
As the red arrow points to the image below，TMS320F28062F have a build-in POR/BOR/OVR。When POR/BOR/OVR happen，the Supervisor reset release delay 400us-800us. therefore,Is necessary to add a additional reset IC to ensures the reliability of DSP reset?
You mean I need to add one reset IC that its reset value higher than BOR trip points? Like the the following IC?
The recommended supply voltage is shown as follows，What are the ripple and noise requirements for the supply voltage？
Hello, good question. The reason the F2806x BOR is set lower than VMIN is raising it would take up too much of the valid VDDIO operating range and make it difficult to purchase a voltage regulator that can supply in the limited range. If you want to proceed with F2806x you are on the right track with an external supervisor IC. I will point out that technically the one you mentioned still falls outside the recommended operating range of F28069 across temperature so you would need to evaluate that risk.
Perhaps I can suggest one of our newer device families, such as TMS320F28002x or TMS320F28003x, which have an internal BOR more in line with what you are looking for. These devices also have more robust device training and ease-of-use development tools such as SysConfig.
Regarding your last question, as long as the ripple is within the recommended operating conditions of the supply, it should not be a big concern in terms of power delivery to the device. That said, another advantage of these newer devices is that the datasheets have guidance of how PSRR can impact analog performance. For example:
(found here)
Thanks for your help，We are actually switching from F28062F to F280025c.
Q1、Can I understand that the DSP should be reset before the voltage drops to VMIN?To ensure the stability and reliability of DSP system.
Q2 As the red arrows are shown below,Is tw(RSL2) all minimum pulse width requirement for reset signal?
Q3 As the red arrows are shown below,Is tw(RSL1) the POR and BOR reset time?
Q4 As described in your reply,The internal BOR function of F280025C can be used instead of externally reset IC to ensure the stability and reliability of DSP system.
