MySensors micro step-up module revision 1.0

[Zeph]

What is the chip used?

[axillent]

@Zeph it is the same as for Battery board - tps61222. It has lowest quiescent current on the market

[BSoft]

@axillent said:

tps61222

In the past i was thinking on TPS78233. The idea was solder it on a pro mini board, then i think it could be difficult to solder something too small and quit the idea :D

[axillent]

@Bandra

@Bandra said:

@axillent Looks like a much-needed part for our battery sensors. Is there any chance of moving the pins together to emulate the current step converter in the store? Ie, having three pins in a row: Vout GND Vin. This makes it a drop-in replacement for the existing part.

unfortunately there is no standard convention of this type. It is hard to match all different needs
input and output connectors are a generic tradeoff

[axillent]

@gregl

@gregl said:

Alex - i guess this chip cannot output both 3.3 and 5V at the same time, so would it be possible to have a module with two of these chips each one at 3.3 and the other at 5v ??
-Then it can be used for 5v sensors/devices.

current draw from the battery is a multiplication from the stepup ratio
this means that current draw from the buttery with 5V output is 1.5 times higher comparing to 3.3V with the same current on the output
also current on the output much less depends on the voltage etc. MCU will draw 1-5mA regardless (with some extend) the VCC voltage
this leads into conclusion that as lower VCC used as better will be battery life

In my opinion 2.4V will be even more optimal for Battery board, but it is much more convenient to have 3.3V

While you need 5V you need to choose:

• best choice is to find all needed components able to work from 3.3V. For example PIR sensor is usually run from 4.5-20V. But there is no problem to purchase PIR running from 0.7-6V
• least optimal choice is to select 5V as a basic operation. This way you can use cheap LDO (like XC6206P332MR) to source radio

having two channels in stepup as you requested will double cost because you will need double number of components

and you always can use two universal modules simultaneously, one configured to 3.3V and other to 5V

[RJ_Make]

Interested.. any ETA?

[hek]

@ServiceXp

A sample has been ordered from factory. When Alexander is back from vacation we'll verify and order production. A wild guess 1-1.5 month.

[axillent]

I'm finally back from a long trip
Sorry to be silent

Seeed stepup boards are awaiting me at home.
Just need to run final performance tests

[bjornhallberg]

@axillent Fantastic! But they will come pre-soldered I hope :P

[axillent]

@bjornhallberg yes sure
this is for so called engineering samples

[Tibus]

wich inductor do you use for this chip. Your inductor seems verry small!

[johnr]

How far away are these today?