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Audio or TV systems with remote control will use digital potentiometers or a similar functions integrated into their audio chip sets. Digital potentiometer ICs with SPI or i2c control are made by various vendors. voltage controlled amplifiers have been used in old systems but aren't common any more. As for the first part of your question, you
Sounds like you are driving FPGA SDA line not correctly as open drain. You say the i2c slave is driving SDA low but only reaches 0.7 V. What's the voltage on both sides of the level translator in this situation? What's the high level?
Hi, use a comparator like the MAX9140. And two resistors to set your desired threshold voltage. Klaus btw: What logic device generates 0.8V low level? Maybe a simple pull down resistor could ensure proper low level. - - - Updated - - - Hi, i2c signals are bidirectional! Therefore you can´t use a
Hey I am using the accelerometer MMA7455, this works to 2.4 to 3.6V, while the entire board works at 5V. To maintain the same voltages of the circuit board and accelerometer, I put the TXB0108 that is able to raise the voltage to 5V (3.3V to 5V). By putting up the circuit I do not receive the coordinates X, Y, Z in the Display. If not beca
MCP23008 IC I/O EXPANDER i2c 8B - Only 2 wires (i2c standard)
Hi, Simple answer: read the arduino's microcontroller datasheet. (If you ask me for a yes/no answer, I need to do the same) Check what's the max signal input voltage for the i2c pins, when supply voltage is 3V3. Often with microcontrollers the max inout voltage is VCC + 0.5V or so... With dedicated i2c (...)
proposal: ACS712 hall effect sensor to measure the DC current , with galvanic insulation range 0-5A , 0-20A ADC12 bits like MCP3304 4CH 12 bits for : -Amps (analog signal from ACS712) -Battery voltage -temperature LM35DZ (0-50°C) 0 -500mV use classic i2c protocole or maybe a specialized device .. see LTC family power management & other s
Hello All, Can someone point me to a circuit, where I can pro-grammatically using SPI/i2c/PWM etc protocols set current source from 0mA to 500mA in steps of 1mA. may be an IC or even transistor-MOSFET based circuit design. Vin MAX= 24V Vin MIN = 3V Vout Max= 24V Iout= 0mA to 500mA in steps of 1mA .. current managed completely us
hi every one can i power mcp23017 using 3.3v supply my dspic works on 3.3v supply. in data sheet it is given as follows Operating voltage: - 1.8V to 5.5V @ -40°C to +85°C - 2.7V to 5.5V @ -40°C to +85°C - 4.5V to 5.5V @ -40°C to +125°C i cant understand the meaning my doubt is can i power the ic with 3.3v will it work correctly? regar
Hello, Is there any variable voltage regulator IC similar to LM317 available the output of which can be interface through a digital interface like i2c or SPI. With regards, Sandeep
which type of battery you are using NImh or Lithium Iron ?for LiOn many ic for monitoring voltage ,low voltage of battery,battery charge current,temperature search on ti website.for read data from such IC simple spi or i2c protocol need to use.
hello, i think you will not find out, direct IC to drive 3 amps at output. did you allready see Microchip MCP23017 .. drive up to 2x8 = 16 outputs dialogue in i2c. after you need to add 1 MOSFET driver as IRLZ14 (gate input at TTL level) for each output to be able to drive 3 the desired voltage (12,24..or more Volts) Maybe sp
No ATmega pin is working in open drain mode without being explicitely programmed for it, except i2c ("TWI") pins. So you should look for the code.
In the past I have used CCS C Compiler that has built in functions for just about anything that we might want to do. These include: RS232 I/O, SPI two wire I/O, Discrete I/O, Parallel port, i2c I/O, Processor controls, Bit/Byte Manipulation, Standard C Math, voltage Ref, A/D Conversion, Standard C char / String, Timers, Standard C memory, Capture
Trying to communicate with lpc2148 inbuilt i2c protocol(i2c0) to external adc chip (pcf8591 philips adc-dac chip) to read adc voltage from it. But proteus simulation with lpc2138 is not responding to the code written.Being a newbie to i2c protocol specifically on LPC2148, can anyone guide me on this. Slave address = (...)
hai everybody, i am looking for a DAC ic with i2c/spi interface that will give 100mA current output , when i searched most of the ics will give only upto 20mA so if anyone knows DAC that gives 100mA current output please help me
HI I am using LTC1840 - Dual Fan Controller with 2-Wire Interface, for one of our projects. I am able to communicate using i2c , however i am not able to change the FAN speed. According to datasheet (as per my understanding) i should update the IDAC register with a value between 0 ~ 255 to change speed. I dont see any voltage difference
Can any one say is it possible to implement this code in ATMEL 24C16 EEPROM device for write the data.while i am implementing this with CPLD xc9572 I/O Pin declared as sda,scl there wont have write operation its operting frequency is 132kHz .voltage compatibility in CPLD is 3.3volt and EEPROM Datasheet describes it will
Are you using i2c library? It uses FOSH01 humidity sensor. Provide its datasheet.
hi, I am trying to interface the mcp23016 port expander with my beaglebone black computer. I have seen some tutorials on i2c interfacing on the beaglebone black. However my problem is getting the interface to work on different voltage levels. My existing circuit uses two mcp 23016 ics that run on 5 volts dc, the connections to the port are al
Does anybody know a serial (SPI, i2c) 32KByte SRAM supporting 2V - 3.6V voltage supplies? 23A256 is the closest solution I found but Vcc can go only up to 1.95V. Thanks!
That's one way. Have a fixed resistor on the main board and use the peripheral resistor as a voltage divider and measure with an ADC. Make sure to leave a big enough gap between values to allow for tolerance stack up. Another way, especially if you think you're going to have a fair number of different sensors, is to use a i2c port expander (such a
A voltage divider can't help for an essentially bidirectional bus. There are two possibilities: - the sensor can work with 3.3V i2c levels (check the datasheet). It's mainly a question of required high levels - it can't work, than one of the i2c level converters from NXP or other vendors must be used P.S.: And a third option. The ?P (...)
hello lee, If you may please describe following questions i can suggest best level converter to you. 1. Do you want a bidirectional 3.3V <> 5V converter? 3. Is it required for i2c? for i2c you need to have bi-directional level translators 2. What is maximum data rate required? 3. Do you want to implement using discrete components? 4. Do you want
For voltage sensing, you can use a voltage divider and sense the voltage using the PIC ADC module. For date and time, you can use a RTC chip and interface it to PIC16F877A. You can use DS1307 and interface it to PIC16F877A using i2c protocol. You may save the data on the PIC EEPROM or you may use an external memory for (...)
Hello everybody :) I am working on engineering work and now I have big problem...I can't do nothing more without it. I'd like to connect with light ambient sensor OSRAM SFH5712, which communicate with ATmega32 by i2c bus, but there is low voltage - only 1,8V and 3,4 Mbit/s communication speed. Of course, this sensor can work with lowest frequency -
Hello friends, 1) is there any power consumption in i2c as compared to spi?How? 2) is it having Wide supply voltage range?How much? 3) Is it having Wide operating temperature range?How much? Please Exploe these Regards Amit Shandilya
What do u mean by the specifications E.g. characteristic of the sensor's digital output signal, low and high level, known interface standard (i2c, 1-Wire, SPI, etc.) if applicable. Supply voltage, protocol, whatsoever.
I am not sure what you want to know. What do you want the DAC for? What resolution, settling time, voltage range? In general, you add the DAC of your choice and throw numbers at it, either parallel or SPI or i2c. Keith
If you really need a digital potentiometer (rather than a variable voltage or current source) then you are best to simply buy a digital potentiometer i.c. There are a lot to choose from, with interfaces such as SPI, i2c or even just up/down pins. All easy to connect to an 8051.
Folks, I?d like to power a 7-segment display with a +12V supply and control it with SAA1064. My i2c bus runs off +5V. Have read the datasheet . Typical supply voltage +5V, max +15V. I didn?t find any contraindication for using +12V power supply. Have anyone tried this? Coul
Elements used: display NORITAKE FG1010RB1 - 10x1 driver MAX6934 driver MAX6851 The drivers need power 3,3V. The display needs 4,3V to glow and anode voltage 24V. The driver due to it
If the receiving device does not have UART port, then using an i2c to UART will not help. Can you please mention the correct MPN of speakjet IC ?
From the datasheet of TXB0108 If pullup or pulldown resistors are connected externally to the data I/Os, their values must be kept higher than 50 kΩ to ensure that they do not contend with the output drivers of the TXB0108. For the same reason, the TXB0108 should not be used in applications such as i2c or 1-Wire where an open-drain dr
Insufficient data.. You should consider what are the other things you want to interface like gsm modem, gps, i2c eeproms. What would be your code size? What is the working voltage and power it can consume ?
LTC1860 is the simplest i2c based ADC I can find. As of DAC, simple i2c solution I don't know but LTC1660 is simple enough if you use SPI. Hope this helps. Tahmid.
Hi, If you are unwilling to use the LM35 in order to avoid ADC, then using a thermistor will not help, as there you would also need the ADC to measure the change in voltage across it due to change in resistance due to change in temperature. If you are don't want to use ADC, you can use something that uses i2c/TWI (TC74) or SPI (TC72) or one-wire(D
Hi, I am a design enginner working on TCA8418 keypad controller. we have interfaced a pic 24f processor with it . The i2c bus is pulled up with a 3.3 k pullup resistor and 1.5 k series resistor for voltage drop from 5 v to 3.3 v as the TCA8418 is a 3.3V IC and PIC24f is a 5v chip. Can any body help me as i am not possible to interface. Any sour
Here's an application note which lists some LCDs in the beginning and then describes how to talk to them on i2c:
I'm not sure, if SAA1064 supports fast i2c as set in your application. You may want to try with safe 100 kHz first. Also the 5V supply voltage most likely requires i2c pull-up resistors to 5V for reliable high levels at the bus.
When defining a project, it's a good idea to start with checking the feasibility. You may want to consult the datasheets of i2c bidirectional buffers, e.g. Philips/NXP P82B96 to understand, why "feed through" doesn't work with a FPGA. In a short, it depends on a special hardware, that detects different voltage levels at the bus. There's a t
Hi... I would like to know about low cost IC (around 1.5$ for 500 pieces)which tat can monitor power from a car battery(12 to 48V) and about low cost 12 Bit ADC IC. Both IC needed with i2c interfaces. Thanks Electra
Is the i2c interface in VGA DB15 connector 5V compatible or 3.3v compatible? I remember that most monitor's i2c is 5v compatible.
Hi all, I am working on a project on PIC16F877A with ATMEL24C512 EEPROM I?C Protocol I am using Hi-tech C Compiler please any of you if Had any piece of code please share I wan to use i2c sample library provided with hi-tech C Thanks
TMP100 is an i2c Slave. Typically, the clock and data lines are operated as open drain with pullup resistors. This allows either device, master or slave to pull the lines low, and allows the logic high voltage to be controlled. Look at the following link for some i2c basic stuff.
Hi All, i would like to ask a question about the use of RTC DS1307 from Maxim. I can get the control to MCU by i2c ... when the supply voltage to the IC is 5V.... However, when i try to add a 3V backup battery to pin 3 of the IC..i found that i can do neither read or write operation to DS1307.... Since i wanna pre-set the time to RTC and t
I am using MSP430F449 to communicate RTC (PCF8563) by software i2c. Here I am giving the i2c coding for PIC picrocontroller. Pls any one convert me to use in my micro controller. Here I am attaching the circuits of mine and the given cord circuit. In my circuit no voltage source is connected at SDA, SCL lines. the code, This (...)
I'm not sure whether this is an analog or digital question. I know that for an i2c line, you have to pull up SDA and SCL. What other lines do you have to pull up? Someone told me that you have to pull up lines that come from open drains. In general, what are guidelines for pulling up lines? Thnx for any replies
i2c it is mainly for intraboard PCB communication. Micro to i2c ADC, etc. CAN is for communication between different equipment.
Hi there, Can any one suggest the method to stablise the programmable ouput voltage.. ciruit is using i2c POT to change the voltage in between...12V,24V & 30V...with i/p:48V.. I am not getting stable o/o vge... TIA, tom