Inspired By:
The Right Way to Use LC Filters on Microcontroller Analog Interfaces
https://www.youtube.com/watch?v=mSehCGvPXOI&ab_channel=AltiumAcademy​

Hey Zach !
I LOVE your videos and have been an Altium customer for about 14 years.

Upfront I want to say that you did an excellent presentation but I really want to expand on a couple of ideas backed up by "reasonable but not perfect simulations".

Click the link below for the full discussion
​

Congratulations to Yocheved our new mobile application developer.  She is joining a strong team including such engineering luminaries as JTZ, BenJ, and DMK.  Together the Tenuvah Designs team is excited to bring even more products to the market place.

Insulin Algorithms is now cleared by the FDA !
www.prnewswire.com/news-releases/fda-clears-insulin-algorithms-comprehensive-insulin-titration-software-for-clinicians-300478537.html

A common design task is to translate between voltage domains or "level shift" for various signaling schemes.  In particular connecting UARTs together, for example and FTDI232R is commonly used in USB <--> Serial adapter cables and an NXP NTB0102 dual suppl translating transceiver with auto direction sensing and 3-state output enable.

Generally the TX of the UART pulls high to indicate a stop bit (no transmission) on start-up and the RX pin should be weakly pulled down to prevent spurious bits.

The subtlety here is that you need to be careful of the auto direction sense circuitry.  Works fine but there can be some gotchas.

PS: tried tying the TX high through a pullup but that did not work.

PPS: If there is a signal integrity concern which is generally not the case for UARTs, series ~32 Ohm resistors on TX output pins can help.  For the exact resistor value you need to look at the V/I curve of the transmitter and pick the resistor value that matches the driver to the 50 Ohm Transmission line.  Layout for 50Ohm T-Lines and cables.  This will also cut down the risk of the EMI/EMC issues since any residual ringing is cutdown by IR drop in the terminator.  


Also helps protect the output driver, although most level shifters have ESD protection of about 2.5kV (Human body model).

A lot of projects have been completed through 2014, BlueTooth, Sensor, and audio design.  Upcoming will be a free design for a very small USB powered Boost/Buck converter for the DIY community.  

Features:
USB or Battery Powered
0.8V to 5.5V Range with an analog trim input ( Upto 1A)
Negative Voltage Charge Pump Tracks Positive Rail
(Upto 25mA, -0.8V to -5.5V)
USB Header Breakout
Current Limiter 
1.5" x 0.8"

iViewCharts is finished and ready for Steve Ruffley
http://www.iviewcharts.com

Just want to give a public 'thank you' to MetaStock for helping support development on your MetaStock 12 platform.

Trader Maker - Steve Ruffley

High speed tick server is up and running with beta testers ! Thanks Peter !

AEI projects are humming along and I want to state for the record that Charles runs a class act !

DCX is nearing prototype phase with a few boards to go.  Fully analog PID loop debugged and works.

FX Internals projects for custom charting, DDA Software (Insulin Algos) are moving along.  It has been a great month !

High speed proprietary data server, custom charting, adaptive algorithms for a full custom trading system.