MCP3428 Are I2C IO pins 5-V tolerant? (Matt Bruensteiner)
For future searches, this question probably applies to MCP3426, MCP3427, and MCP3428. The datasheet for these parts gives an absolute maximum for "all inputs and outputs" of Vdd + 0.4 V. A spec like...
View ArticleMCP45HV Digipot addressing problems (PIC_USR)
Hi There, I'm using a pair of MCP45HVX1 digi-pots on my board, each one works fine if I use the address byte as 0x00. Neither work if I set it to what the datasheet says, 0x78 for A1=0:A0 = 0 or 0x7A...
View ArticleStrange output from MCP39F501 Energy IC (thiagorod)
Hello, I designed a board following the schematics from the EV Board of this IC (but a simpler design). The power supply is good and stable, providing 12VDC to a UA78M33 and then converting it to 3.3V...
View ArticleDigital HID ballast? (elberto)
Hi to all, I hope to post in right section, if not please move discussion. I was taking a look to digital HID ballast reference design and I've seen board is available only for demonstration purposes...
View ArticleNo output at MCP23017 ports (vishalgpt)
Hello, it's my first time that I'm posting a query on any forum. So, I have zero experience with MCP23017, and need to use multiple of them in my project. So, for testing purpose I started with single...
View ArticleMCP16301 EMC issues (SGHughes42)
I've designed a circuit which uses an MCP16301 to drop a 24V rail down to 5V. We've just had the product EMC tested and it failed Class B with extra probing showing the inductor as the source of the...
View ArticleMIC2251 Output voltage drops to zero after load ~1.5A (loko)
Hey folks, I've a big issue with the mic2251. As I noticed correctly this boost converter is able to deliver 2A?I've used different inductors from 10µH, 22µH and also 100µH and a MBRS340T3G (rated to...
View ArticleMCP39F521 Question (laffelt)
I am using the MCP39F521 in a new design which will be monitoring and controlling the AC rms power to a transformer. I will not be using the energy accumulation functions, just using it for power...
View ArticleMCP48FVB22 SPI DAC code example? (twelve12pm)
Is there some example code (doesn't matter which MCU it is for) that shows how to setup the MCP48FVB22 configuration registers and how to output various analog voltages? I'm just looking for a simple...
View ArticleMCP39F521 EEPROM READ results not expected (sridhar_rajagopal)
I'm trying to implement reading and writing to EEPROM on the MCP39F521 - i.e. the "PAGE READ EEPROM COMMAND" and "PAGE WRITE EEPROM COMMAND" PAGE READ in the datasheet says that the response is "ACK +...
View ArticleDr. Wattson - Energy Monitoring Board for Arduino, based on MCP39F521...
Hello everyone! I have created a new energy monitoring breakout board based on the MCP39F521 for Arduino and other MCUs, that I call Dr. Wattson - please check out http://bit.ly/2wg2wte for more...
View Articledigital pot, low current draw (brownt)
I am using a 50kohm MCP4341 and I am expecting to be able to draw up to 15mA through the wiper, but that is not the case. I am using the quad pot in this manner. The wipers are all permanently tied...
View Articleshared vs separate analog / digital power pins (bg_blea)
When using AVDD and AVSS as reference for the ADC, is it preferable to select a chip that has separate analog power pins over one that shares them with the digital power pins in order to minimize...
View ArticleHelp using Micrel MIC2101 (andrefleitao)
Hi. I noticed that the Pololu D24V50F5 Step-Down voltage regulator uses the Micrel MIC2101 controller. Theirinductor is 1.8 uH (1R8 in the image here https://a.pololu-files.co...6a58c48aa66a6b29cf674)...
View ArticleTC664/TC665 Fan Speed PWM controlling and Monitoring RPM (kalesha)
Hi group, We are using TC664 to control motor speed (PWM) and also monitoring the speed RPM by SMBus I2C communication The Pin Vout which is PWM out to control motor is based on Input of Vin pin or...
View ArticleLoad cell and Hx711 interfacing with pic mcu (chaitanya_gaware)
I am working on the load cell it has four wire i am using hx711 module to get the data from it but i am getting confused with the data it send, hx711 module send the 24 bit data , my first problem is...
View ArticleMCP39F521 Register Read (laffelt)
I have designed a small board using the MCP39F521 chip to monitor AC line voltage and power. The I2C interface is running well, I am instructing the chip to read back 24 bytes (0x18) starting at the...
View ArticleMCP39F521 Current measurement haywire (inky)
Greetings all, I have designed a four channel device with relays so each channel can be turned off when I require it. I have mimicked the dev board for the circuit design, albeit, the V_plus and the...
View ArticleWhy do MCP 6N16 in amp need the feedback loop to be connected to Vref ? (luk)
Hello,I need a 1x gain from an MCP6N16 intrumentation amplifier. I need the output to be shifted by VDD/2.My first attemp to acheive it is to short the OUT pin to the FEEDBACK pin and connect a...
View ArticleHV2601 Analog Switch (kr narendra)
Hello everyone,We use a HV2601 from microchip that works on the recommended +100v &-100v supply.Can it be used with +75v and -75V ?.Do help us.Regards...
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