I've read through the TI document "Feature Differences between the TPS65950 and TPS65951", but have not been able to resolve all my questions.
I'm designing a new product using the DM3730CUS processor and the TPS65951 power processor. I am using the TPS65951 power controller rather than the TPS65950 b/c our assembler is concerned about their ability to reliably place the 0.4mm fine pitch TPS65950 BGA package.
I've used the BeagleBoard xM open source project as a reference and believe I have a good understanding of the design and layout constraints. However, there are some differences between the '50 and '51 that are neither documented in the specification sheets nor in the Feature Difference document.
The following pins are on the TPS65950 , but are not on the TPS65951:
- VMODE1
- CLK256FS
- SLEEP2
- GPIO.17
- ADCIN5
- ADCIN4
- ADCIN6
- VSIM
- KPD pins
- INT2
- nSLEEP2
- BCCS
- VBATS
- MANU (I believe this corresponds to the MANU.BRIX pin on the '51)
- ICTLAC1/2
- ICTLUSB1/2
- PCHGAC
- PCHGUSB
- BCIAUTO
The following pins are on the TPS65951, but are not on the TPS65950:
- CHRG_DET_N
- USBCHRG_ENZ
- USBCHRG_STATZ
- VPROG
- VUSBIN.CPOUT
Many of these differences are incidental to my design. My questions are:
- Is there further application support for the TPS65951, such as an example or reference design?
- I am not using the charging circuit and would like to make sure that I tie off the unused charger pins so that they do not interfere with the system running from a fixed 4.2V input source into VBAT. How should the charger-specific pins be wired?
- I am using the '51 USB OTG functionality. How should the USB power path be implemented? Specifically, what are the differences between the '50 and the '51 USB power path and how should the'51 VUSBIN.CPOUT be wired?
- What does the '51 VPROG line do, and how should it be connected?
- What does the '50 CLK256FS line do? (not described in the spec sheet) And (if anyone knows), how is this used in the Beagle Board xM design?
Thank you in advance for your help.