Request for a schematic review - paid opportunity, if you wish

[Davidelvig]

I've designed only a few Teensy boards. I now am designing a new Teensy 4.1 daughterboard.
I could use coaching from a more seasoned Teensy-board-familiar electrical engineering type person.

My main interest at this time:
- assure I'm using Teensy power pins correcting (GND, VIN, VUSB, 3V3, VBAT)

On my daughter board, I have:
- LiPo charging, LiPo connector, and powering of VIN when USB is disconnected
- CR2032 coin cell on VBAT
- Teensy 3V3 pin powers a 3V3 bus to power

a small screen
an IMU (tiny mA)
an analog pressure sensor (tiny mA)
a VS1053 synth chip (30-30 mA at full volume)
an SGTL5000 audio chip (12 mA?)
​

The pressure sensor and screen are not connected during early testing (and hence consuming no power).

Thanks. Please direct message me.
Dave

 

[bicycleguy]

see this post on VBAT life on T4.1
https://forum.pjrc.com/threads/64216-Beware!-T4x-RTC-power-consumption?p=257979&viewfull=1#post257979

 

[Davidelvig]

Thanks, and wow! I had not considered easy swapping on the coin cell in my design.
I’ll have to mull this over.

 

[Davidelvig]

I’ve had help on the original issue leading to this post and the main problem is solved. The post on VBAT was an extra bonus!