On Wed, Mar 2, 2016 at 10:49 PM, Jakub Kákona <[email protected]> wrote: > Thanks for the diagram!
no problem. > But I have one more question. Is it really necessarily to operate bq24193's > I²C bus at 1.8V? i don't know! :) > According to datasheet http://www.ti.com/lit/ds/symlink/bq24193.pdf > The 1.8V was used only as example of operating voltage.. > The Absolute Maximum Ratings for all SDA, SCL and INT pins is 7V and both > are "i2c standard open collectors" and could be pulled-up to any rail within > the operating voltage range.. > Therefore I think the Voltage translator is not necessary... if you reckon an STM32F072 could handle it, then fine. that saves at least 2 ICs, which is great. if you'd like to actually test it, STM32F072-NUCLEO boards are only $EUR 10 from rs-online, mouser, arrow and digikey. ok, so key question: what sort of timescale do you think you'd be able to do this in? reason i ask is, i need to work out the timeline. practical matters: i used eurocircuits to get the PCBs done, they were about 7-10 days (unless you pay extra), and around $EUR 70 for QTY2. i have some components (connectors, switches, capacitors) i can send you. more practical matters: from mid-april i'm going to be moving to a new country *every month* until the end of the year, to track getting this into a first production run. l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
