For our 3d Pong project, we need a voltage regulator. We get an 4.5V input, or 5V input when it is recharging, and that need to be converted to a 3.3V DC signal for our microcontroller. What IC do you recommend us?
I narrowed the search for you
You need to determine if you want through hole and current
You can then pick a price point
The first one is fine
Mcp1600-3302e foe low current
The lm3940-3.3 gives you 1A
imsmooth:
Power Management (PMIC) | Electronic Components Distributor DigiKeyI narrowed the search for you
You need to determine if you want through hole and currentYou can then pick a price point
The first one is fine
Mcp1600-3302e foe low currentThe lm3940-3.3 gives you 1A
Thanks. I did some search as well, and came to this: https://www.sparkfun.com/datasheets/Components/LD1117V33.pdf. Is this one fine too?
Furthermore I said the max output current has to be 1A. This might be way too high.. The only thing we want to provide from electrical current is a microcntroller with a gyroscope (ITG 3200) and a transmitter (RADIOMETRIX TX2A). In the datasheets I see the ITG 3200 only uses max 6,5 mA and the RADIOMETRIX TX2A uses max 13 mA. Am I right? Please check.
That would mean I'd only need a (~20mA + microcontroller working current (PICF1513)) output, right? Then I assume 1A is way too high..
I think this one
unless you want to spend a little more and use a switching regulator that can self- adjust to get the most out of your battery(s):
Look at Table 9 for the LD1117 - needs more >=4.75V to create 3.3V. You said 4.5V was the low end.
CrossRoads:
Look at Table 9 for the LD1117 - needs more >=4.75V to create 3.3V. You said 4.5V was the low end.
Yes you are right! Overlooked that.. Thanks. But are my conclusions right that the Gyroscope and the Transmitter only uses 6,5mA and 13mA max? And how much current will draw the micrcontroller (PICF1513) itself?
I don't know about the other parts, I didn't dig into all those datasheet.
PICF1513 is not Arduino, you could ask in a PIC forum about that.
A switching converter will be much more efficient than a basic regulator:
Based on the application and a similar project I did recently with ADXL345, 433Mhz transmitter andATTiny84 I have some specs:
When the device sleeps (most of the time) it consumes about 140 microAmperes. When it wakes and does some measurements it consumes about 15mA during 0.5seconds and goes back to sleep again. I use 3xAAA batteries for power. I have been measuring the voltage from 3 low cost batteries for a month now with triple time usage against normal. Voltage has dropped 2mV sofar on my Fluke. There is a switching boost regulator for the transmitter and a LED (low power). The boost can work from 1.8V-5.5V. The tiny is powered directly from the battery and the ADXL through a 3.3V LDO. The ADXL345 can work at lower voltages. The regulator limits the voltage to 3.3V and once it gets below it stops regulating but that is no problem as the ADXL can still work at lower voltages.
Guestimation for the batteries is at least one year..
J have been experimenting with the antenna a bit and it seems to work best as a straight wire (folded in a square size like the PCB). The picture was taken earlier. The range is at least 12 metres (including walls and doors). That is sufficient for thisproject.