From b951df97a54cbb08b1432939d771c3efda00940e Mon Sep 17 00:00:00 2001 From: rickb44 Date: Sun, 27 Dec 2015 21:05:56 +0000 Subject: [PATCH] Intermediate updates of schematics. Add questions-12-27-2015 git-svn-id: https://svn.code.sf.net/p/freetel/code@2577 01035d8c-6547-0410-b346-abe4f91aad63 --- sm2000/doc/Questions-12-27-2015.txt | 35 +++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 sm2000/doc/Questions-12-27-2015.txt diff --git a/sm2000/doc/Questions-12-27-2015.txt b/sm2000/doc/Questions-12-27-2015.txt new file mode 100644 index 00000000..d6d92848 --- /dev/null +++ b/sm2000/doc/Questions-12-27-2015.txt @@ -0,0 +1,35 @@ +Questions for Dave +12/27/15 + + 1. 4 Status LEDS Pg 1? + 2. Led power on indicator? Pg 1 + 3. Select & Back Switches? Pg1 + 4. Usart 3 pullups? Pg 1 + 5. Boot1 pulldown? Pg 1 + 6. Stlink Conn & SIgs? Pg1 + 7. Self Test jmpr & pullup? Pg1 + 8. Reset Switch, pullup& cap? Pg1 + 9. STM32F4907 power section OK? Pg1 + 10. CPU AIN1 & 2 ? Pg1 + 11. CPU DAC1(2)? others? Pg1 + 12. Test points? Where & type? PG1 & 2 + 13. Ext SPI & I2c I/O? + 14. I2c to Si570 & SI 5351? + 15. 8 MHz osc(CPU)? Pg1 + 16. Uart 3.3V I/O pullups? + 17. Same USP OTG Interface? Pg1 + 18. EEPROM chip & interface? PG1 + 19. Review Voltage regulators? Pg2 What is Vgg? + 20. Int/Ext MIC interface, same? Pg2 + 21. Speaker? Amp? Ext SPKR & COnn? Pg2 + 22. Same Vdd -> AVdd filtering? Pg2 + 23. Start with 160mm x 100mm PCB? 4 layers? + 24. Same power input jack? Pg2 + 25. Ext PTT input? isolated? Pg2 + 26. Jumper blocks 2 x 2? where? PG 3 & 4 + 27. Scope probe footprints? Where? + + +Power Dissipation? +1.568W xls sht. 33.38W in regulators. Eliminate 9V regulator? power still high. +FIltering on +12V input. Limit input to 12V - 14V? 13.8V in shack or mobile, 12V PS common? difficult to accomodate wider range. -- 2.25.1