#embeddeddesign

bq25185 + TPS61023 = USB or Solar lipoly with 5V output 🔋☀️🔌

We spent the weekend tweaking our bq25185

https://www.digikey.com/short/8hd2778w

designs and made one basic breakout for this flexible battery charging chip. Then, we made a board with a 3.3V buck output to charge the battery with a USB or solar panel and got a clean and consistent 3.3V out. With both of those working, here's a design for a version that has a 5V booster with the TPS61023

PCM510x MCLK-less I2S DAC with line level out 🎧💻

We're starting to stock a lot of chips that are able to do digital I2S out, which makes for great-quality audio playback. That's great when you have enough processing power to decode WAVs or MP3s in real-time. However, we could really use some better DACs in the shop. We like the UDA1334A

TLV320DAC3100 take 2 🎧🔊

After much wrasslin’ with the TLV320DAC3100, we finally have a library that properly configures the PLL and sets up both the headphone and speaker output well enough. However, we made a mistake with the headphone wiring, accidentally swapping ground and mic, and we’re experiencing some noise in the headphones when the Class D speaker output is active.

We’re rerouting the board to separate the speaker outputs from the TRRS jack to address this. While at it, we’re also exposing the MICDET and bias pins—interestingly, the mic detects can double as a potentiometer input for volume control. The board grew by 50 mils, but we believe this version is the one. After testing, it should be ready for sale.

MOAR Sparkle Motion testing - built-in I2S mic 🎤📊

We're rounding the corner with testing our Sparkle Motion

Got lots and lots of solenoids?

We were chatting with a customer and realized we need a better solution for customers with many solenoids or other high-current on/off loads. This breakout will make it easy to control and power many inductive or high-current loads. An mcp23017

https://www.digikey.com/short/nf4pn2rc

expander over I2C provides 8 output pins, each connected to an AO3406 N-Channel FET

https://www.digikey.com/short/rh398zbh

with a 1N4007 flyback diode.

https://www.digikey.com/short/343h9890

TDK InvenSense T5837 PDM mic with low power auto-wake on sound 🔊🎤🔋

On a recent Great Search, we looked at I2S microphones

- but we also glanced at the latest offerings from TDK InvenSense

and found an interesting PDM mic with 'low power auto-wake' - the T5837

CP2105 dual UART breakout 🔌💻

Sometimes, you need more than one UART for interfacing with hardware. So instead of getting two CP2102 breakouts

you could use this CP2105