Hello I recently bought a few MCP1640T-I/CHY. I am using them to get 5v from 3.7v when using li-po battery or 4.5v when using USB (4.5v because of a diode).
This is the schematic to get 5v I am using: [link=https://www.dropbox.com/s/rh4b0ia30
MCP1640 very hot (dragondgold)
↧
↧
Is this a Microchip part? (picture) (elektrinis)
Found on lithium battery protection board. One chip for 4 cells. Anyone recognizes it?
http://i.imgur.com/a3sZU4w.jpg
edit: this is mitsumi. Info no longer needed.
↧
MCP3421 one cell lipo fuel gauge (exapod)
Hi,
i want to use the MCP3421 18 bit ADC as a basic fuel gauge for a one cell lipo.
If i connect the VIN- to my ground the max voltage that i can read is 2.048 V, a fully charged lipo is 4.1V, i was thinking of using a voltage divider but i really do
↧
Fast data logger with PIC (ctzof)
Hello everyone,
I want to make a fast data logger card with PIC. The card is going to read input dc and ac voltages, convert them to digital values and store them to an external memory or to PC. Here are the specifications:
1. Fast 10-bit sample
↧
Document AN1149 - MCP73837/8 - bug in the Figure 2 - wrong PMOS position?? (Johnny_Poland)
Hello,
I am working on battery charger system with MCP73837. During reading AN1149 I have focused on the the Figure 2 on the PMOS transistor. Below I am sending the original part of picture with described the Gate, Drain and Sou
↧
↧
MCP73871-2AA (vojinilic)
Hi All,
I'm using MCP73871-2AA and I've connected ~TE pin to GND. This meand that safety timer is enabled. When I fully charge LiPoly battery my STAT1 output is turned on. In Microchip's PDF is written that safety timer for this IC is disable
↧
MCP73831 STAT ouput. LED options (Medic)
Hi experts,
I have a MCP73831 for charging the lithium battery in my circuit but have found connecting LEDs for CHARGING and CHARGED status on the STAT line results in several mA quiescent current which runs the battery down when the c
↧
Sound pressure meter + RF transmission problem (kw)
So the problem is the following.
I have an application where every N milliseconds I sample a number of signals, then switch on a radio and send them.
Normally the interference introduced by the radio to the opamps does not matter, because I sample du
↧
Power hungry radio module screwing up my op amp! (kw)
So I have a radio module that consumes 40mA more when transmitting than when it is not transmitting.
It transmits several hundred times a second. I see that when it is transmitting, the opamp output (MCP6052 amplifying a microphone signal by 1000 times
↧
↧
Benefit of using 2 amplification stages against ground noise, coupling, impedance (kw)
So right now I use a single opamp stage (MCP6052) to amplify an electret mic signal with gain = 1000.
Now before we begin let me verify if the gain is really 1000. The electret mic is connected to ground directly, and to V+ through a 10k resistor.
Th
↧
MCP4728 datasheet serious bug (Eigen)
MCP4728 datasheet serious bug
Thers is a serious bug of MCP4728 datasheet in the Figure 5-6 General call Read I2C address.
Waste a lot of time do debug.
The Figure 5-6 is wrong ,the Figure 5-6 show ACK (Master ) this is a big bug.
↧
MCP1700-5002E/TO question about minimum Vin. (chstr23)
Hello, I would like to use the MCP1700-5002E/TO with a 3.7v litio battery. But I have a problem, because the mcp not work fine. If vi
↧
MCP3551 - Odd results? (RichardJAston)
I'm going wrong somewhere but there has to be a limit to how many times I can read the datasheet before mental atrophy sets in!
I am using a Zilog MCU (Z8F6423) to interface with the MCP3551. CS is driven through a HC138 decoder. S
↧
↧
chopper stabilized amplifiers (gsac)
I am using a section of MCP6V02 as a follower ( buffer ) of a voltage reference.
I have some troubles because I see a triangular ripple with 400mV ( PkPk ) with a frequency of about 150KHz.
What is wrong in my design ?
↧
MCP73871 - PROG2, TE, CE Pins (brad.young)
Hello All,
I am looking to implement a MCP73871 into my design. The device will primarily be powered and recharged by USB, but needs to be able to run on the battery when its disconnected. The MCP73871 seems to be a sensible choice
↧
IC for TV booster by Microchip (micropad)
Dear All
Any one would please advice me about IC that introduce by Microchip used booster for TV signal
Thanks in advance
↧
Why are the Microchip forums targets of off topic spam? (dan1138)
The topic of my post is rhetorical.
So why are the Microchip forums targets of off topic spam?
The most obvious is that these forums are popular, active and allow any user to post links to anywhere on the internet.
There are a lot of site
↧
↧
USB2514B USB 2.0 Hi-Speed Hub Controller Trouble (Konstantin)
We have a device with usb2514b USB hub. The Device have worked fine about half year. One day after weekends we powered on the device and somehow USB didn't work. After some explorations we've figured out that all components and paths are all right. But a
↧
MCP624- Solar current Sensing- Problems Op Amp (svia)
I want to measure the current driven by a solar cell. Cell is 6V maximum, and current 80mA. I use a 1Ohm shunt resistor, that goes form ground terminal of the cell, to ground.
I'm using one op amplifier of MCP624. (I now that maybe it is not t
↧
Behaviour of MCP73831 when no battery is attached? (XorXaX)
Hello,
I have a circuit with a PIC18 whit USB that uses a MCP73831 for battery charging.
The +5V from USB goes in to the MCP73831 with a 4,7uF ceramic capacitor on the input and one
on the output, and then the battery. The PROG r
↧
