- Forums
- Product Forums
- General Purpose MicrocontrollersGeneral Purpose Microcontrollers
- i.MX Forumsi.MX Forums
- QorIQ Processing PlatformsQorIQ Processing Platforms
- Identification and SecurityIdentification and Security
- Power ManagementPower Management
- Wireless ConnectivityWireless Connectivity
- RFID / NFCRFID / NFC
- Advanced AnalogAdvanced Analog
- MCX Microcontrollers
- S32G
- S32K
- S32V
- MPC5xxx
- Other NXP Products
- S12 / MagniV Microcontrollers
- Powertrain and Electrification Analog Drivers
- Sensors
- Vybrid Processors
- Digital Signal Controllers
- 8-bit Microcontrollers
- ColdFire/68K Microcontrollers and Processors
- PowerQUICC Processors
- OSBDM and TBDML
- S32M
- S32Z/E
-
- Solution Forums
- Software Forums
- MCUXpresso Software and ToolsMCUXpresso Software and Tools
- CodeWarriorCodeWarrior
- MQX Software SolutionsMQX Software Solutions
- Model-Based Design Toolbox (MBDT)Model-Based Design Toolbox (MBDT)
- FreeMASTER
- eIQ Machine Learning Software
- Embedded Software and Tools Clinic
- S32 SDK
- S32 Design Studio
- GUI Guider
- Zephyr Project
- Voice Technology
- Application Software Packs
- Secure Provisioning SDK (SPSDK)
- Processor Expert Software
- Generative AI & LLMs
-
- Topics
- Mobile Robotics - Drones and RoversMobile Robotics - Drones and Rovers
- NXP Training ContentNXP Training Content
- University ProgramsUniversity Programs
- Rapid IoT
- NXP Designs
- SafeAssure-Community
- OSS Security & Maintenance
- Using Our Community
-
- Cloud Lab Forums
-
- Knowledge Bases
- ARM Microcontrollers
- i.MX Processors
- Identification and Security
- Model-Based Design Toolbox (MBDT)
- QorIQ Processing Platforms
- S32 Automotive Processing Platform
- Wireless Connectivity
- CodeWarrior
- MCUXpresso Suite of Software and Tools
- MQX Software Solutions
- RFID / NFC
- Advanced Analog
-
- NXP Tech Blogs
- Home
- :
- i.MX Forums
- :
- i.MX Processors
- :
- Re: Using iMX27 with MC13783 Power Management, no Switcher outputs!
Using iMX27 with MC13783 Power Management, no Switcher outputs!
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page
Using iMX27 with MC13783 Power Management, no Switcher outputs!
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
I have a development card using an iMX27 processor and an MC13783 Power Management device to provide the LDO and Switcher rails that I require to power the iMX27. I have configured the PUMS pins on the MC13783 to provide +1V2 on SW1 and +1V8 on SW2 but I'm not getting any outputs from these 2 switchers. Both PUMS1 and PUMS2 are connected to GND, and PUMS3 is floating - I have followed the MC13783 User guide, specifically section 5.3 of the document. The LDO's are present and SW3 (unused) is also up and running. SW1 and SW2 are both configured for 'Parallel use' to provide up to 1A. Has anyone else had issues with the MC13783 power management device used in this manner with the iMX27?
Regards,
Darren
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
My email address is darren.harrold@vislink.com if you want to communicate directly.
Darren
Chuck Farago said:
Hello Darren,
Yes, the missing terminations are the reason for your switcher issues. In particular, the charger related connections and the VINCAM connection are important for proper switcher operation. Please see the enclosed unused charger and unused pin list documents, and ensure that your entire design complies with the info in these documents. If you have further questions, please let us know.
Thanks & Regards,
Chuck
Darren Harrold said:Hi Chuck,
I'm using the MC13783VK5 device. Yes I did see this document on the Freescale website and I think I have my circuit wired for the VK5 part with both SW1 and SW2 set for 'Parallel mode'. The pages from my schematic where the MC13783 is used are attached for you to look at. One document that was pointed out to me was AN3276 - Interfacing iMX31 to MC13783. In this document section 6.4.1 states recommendations for terminations related to unused functions. On my circuit I don't have VINVIB or VINCAM connected to +3V3. Also it states that the pins CHRGISNSP, CHRGISNSN, BATTISNS and BATT should be tied to +3V3 but again I haven't connected these pins to anything. I have connected CHRGMOD0 to GND and CHRGMOD1 to VATLAS. Could these missing terminations be the reason why I'm not having the correct voltages from SW1 and SW2??
Regards,
Darren
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi Chuck,
Ok thank you for the reply and the attached documents. I will modify the next revision of my design and incorporate the changes as per the documentation.
Is it possible to email you directly at Freescale so I can send you the schematics for the next revision of my design, so you can confirm I've connected the missing unused pins correctly?
Regards,
Darren
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello Darren,
Yes, the missing terminations are the reason for your switcher issues. In particular, the charger related connections and the VINCAM connection are important for proper switcher operation. Please see the enclosed unused charger and unused pin list documents, and ensure that your entire design complies with the info in these documents. If you have further questions, please let us know.
Thanks & Regards,
Chuck
Darren Harrold said:
Hi Chuck,
I'm using the MC13783VK5 device. Yes I did see this document on the Freescale website and I think I have my circuit wired for the VK5 part with both SW1 and SW2 set for 'Parallel mode'. The pages from my schematic where the MC13783 is used are attached for you to look at. One document that was pointed out to me was AN3276 - Interfacing iMX31 to MC13783. In this document section 6.4.1 states recommendations for terminations related to unused functions. On my circuit I don't have VINVIB or VINCAM connected to +3V3. Also it states that the pins CHRGISNSP, CHRGISNSN, BATTISNS and BATT should be tied to +3V3 but again I haven't connected these pins to anything. I have connected CHRGMOD0 to GND and CHRGMOD1 to VATLAS. Could these missing terminations be the reason why I'm not having the correct voltages from SW1 and SW2??
Regards,
Darren
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi Chuck,
I'm using the MC13783VK5 device. Yes I did see this document on the Freescale website and I think I have my circuit wired for the VK5 part with both SW1 and SW2 set for 'Parallel mode'. The pages from my schematic where the MC13783 is used are attached for you to look at. One document that was pointed out to me was AN3276 - Interfacing iMX31 to MC13783. In this document section 6.4.1 states recommendations for terminations related to unused functions. On my circuit I don't have VINVIB or VINCAM connected to +3V3. Also it states that the pins CHRGISNSP, CHRGISNSN, BATTISNS and BATT should be tied to +3V3 but again I haven't connected these pins to anything. I have connected CHRGMOD0 to GND and CHRGMOD1 to VATLAS. Could these missing terminations be the reason why I'm not having the correct voltages from SW1 and SW2??
Regards,
Darren
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello Darren,
Can you please provide the top markings of the MC13783 ICs that you are using? Also, please ensure that your schematic follows the recommendations in the enclosed application note AN3417 for your IC version. You can also find this app note on www.freescale.com.
Thanks and Regards,
Chuck
PMIC Applications
Freescale Semiconductor
