From c0c9ca88c506bb9c23efba6cb78cf3935a0aa240 Mon Sep 17 00:00:00 2001 From: G Bulmer Date: Tue, 16 Apr 2013 08:58:21 +0100 Subject: Updated README's describing 'Tweaked' position of User LED pads and DISC 'via' to give access to signals. --- Orone-mini-v0/Orone-mini-S8C-v0r001/README.md | 4 +++- Orone-mini-v0/README.md | 7 ++++--- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/Orone-mini-v0/Orone-mini-S8C-v0r001/README.md b/Orone-mini-v0/Orone-mini-S8C-v0r001/README.md index c2c2a12..c9b3f76 100644 --- a/Orone-mini-v0/Orone-mini-S8C-v0r001/README.md +++ b/Orone-mini-v0/Orone-mini-S8C-v0r001/README.md @@ -22,7 +22,9 @@ However there are areas that can be improved: 3. USB Electro-static Discharge (ESD) protecting the Host PC and Orone-mini 4. Socket for easier-to-connect external power 5. Power-on indicator +6. Access to all STM32F signals; two are not connected to header pins -All of these improvements are incorporated in the Orone-mini-S8 boards. + +All of these improvements are incorporated in the Orone-mini-S8C. The two signals of item 6, are not easy to access. Though both signals are on the standard 0.1" grid, they are on the interior of the board, and one signal is only available from the User LED pads. The idea is to enable anyone stacking a daughterboard, to use the extra two signals. Putting the signal pads on a 0.1" grid supports the use of simple daughterboard technology like matrix board, or strip board (e.g. Veroboard). Maple-mini uses very small components in order to achieve its 0.6" pin-header spacing. One of those components is expensive and difficult to source, C1, the power supply smoothing capacitor. Maple-mini uses a 1206 case size for C1. This has been replaced by a 2917 (7343 Metric) case size. diff --git a/Orone-mini-v0/README.md b/Orone-mini-v0/README.md index f41c137..cad83e8 100644 --- a/Orone-mini-v0/README.md +++ b/Orone-mini-v0/README.md @@ -14,6 +14,7 @@ However there are areas that can be improved: 3. USB Electro-static Discharge (ESD) protecting the Host PC and Orone-mini 4. Socket for easier-to-connect external power 5. Power-on indicator +6. Access to all STM32F signals; two are not connected to header pins These boards are designed to be DIY-assemblable, but otherwise software and signal compatible with Maple-mini. @@ -22,13 +23,13 @@ All designs are breadboard-friendly form-factors; all pins are on breadboard 0.1 * **Orone-mini-S8A-v0r001** - Maple-mini compatible STM32F development board. *Format*: two 20pin headers 0.8" apart. 1206 Components, SOT-223 voltage regulator uses LM2937-style, 'tab-is-ground', footprint - Improves on all 5 areas + Improves on first 5 areas Not yet tested. * **Orone-mini-S8C-v0r001** - Maple-mini compatible STM32F development board. *Format*: two 20pin headers 0.8" apart. 1206 Components (C1 is 2917/7343), SOT-223 voltage regulator uses LM2937-style, 'tab-is-ground', footprint - Essentially this is Orone-mini-S8A-v0r001, and so incorporates all the same improvements. However, it uses a much larger case size for C1, the supply smoothing capacitor to reduce cost, and simplify sourcing of a suitable part. C1 is 100uF/16V, Maple-mini 1206-case size has been replaced by 2917 (7343 Metric) case size. + This is similar to Orone-mini-S8A-v0r001, however it incorporates all six improvements. Further, it uses a much larger case size for C1, the supply smoothing capacitor. This reduces cost, and simplifies sourcing of a suitable part. C1 is 100uF/16V, Maple-mini 1206-case size has been replaced by 2917 (7343 Metric) case size. Not yet tested. @@ -42,7 +43,7 @@ Maple-mini Hardware compatibility --------------------------------- Orone-mini-S8x boards are not physically compatible with Maple-mini because the pin headers have been moved from 0.6" spacing to 0.8" spacing. This was a result of the increased component size used on Orone-mini. The increased component size is driven by the aim to make Orone-mini DIY-assemblable. -All Orone-mini have one change to the header pins. The Maple-mini's 'av+' power was supplied by a small voltage regulator which might close down, or be damaged when the Maple-mini was used with a power supply voltage higher than USB's voltage. Orone-mini supplies power to the 'av+' pin from a slightly larger capacity voltage regulator. The intent is to avoid damage to the small voltage regulator. However this feature has not been adequately tested yet. +All Orone-minis have one change to the header pins. The Maple-mini's 'av+' power was supplied by a small voltage regulator which might close down, or be damaged when the Maple-mini was used with a power supply voltage much higher than USB's voltage. Orone-mini supplies power to the 'av+' pin from a slightly larger capacity voltage regulator. The intent is to avoid damage to the small voltage regulator. However this feature has not been adequately tested yet. The orone-mini silk screen is larger-size text, and hence contains less information, than Maple-mini. The increase in size is intended to be easier to read, and easier for PCB makers to produce. -- cgit v1.2.3