Sage-Tips

Does I2C work with 3. 3 V?

Both of it’s I2C interfaces run at 3.3v. I2C devices purchased through Sparkfun, Adafruit, SeeedStudio, Parallax, Pololu, can be any combination of 3.3v or 5v.

Is TTL 5V or 3. 3 V?

People often say “TTL” when they really mean 5V CMOS. Real 5V TTL (74LS and similar) has 3.3V compatible input thresholds but has much higher input current requirements than any CMOS device does. So you need to make sure your 3.3V device can deliver enough current for the TTL inputs.

What voltage does I2C use?

I2C uses only two bidirectional open-collector or open-drain lines: serial data line (SDA) and serial clock line (SCL), pulled up with resistors. Typical voltages used are +5 V or +3.3 V, although systems with other voltages are permitted.

What is 3. 3 v logic?

3.3 V CMOS Logic Levels A 3.3 V device can interface with a 5V device without any additional components. For example, a logic 1 (HIGH) from a 3.3 V device will be at least 2.4 V. This will still be interpreted as a logic 1 (HIGH) to a 5V system because it is above the VIH of 2 V.

What is I2C frame format?

I2C Packet Format : In the I2C communication protocol, the data is transmitted in the form of packets. These packets are 9 bits long, out of which the first 8 bits are put in SDA line and the 9th bit is reserved for ACK/NACK i.e. Acknowledge or Not Acknowledge by the receiver.

What is the voltage of the low level threshold for an I2C signal?

The I2C standard defines the low-level threshold with 0.3 Vcc, the high-level threshold with 0.7 Vcc.

Can you connect a 3.3 V UART directly with a 5V UART?

Advanced Member level 3 Yes, you can but, this IC is one way direction. That’s mean you have to use two of this IC.

Is I2C low power?

We measured the signals of I2C with oscilloscope, and found the low voltage level of I2C wave is about 860mV.

How many devices can you connect to the I2C bus?

128 devices
I2C Device Addressing All of our modules and the common chips you will use will have 7 bit addresses. This means that you can have up to 128 devices on the I2C bus, since a 7bit number can be from 0 to 127.

What is the difference between TTL and Lvttl?

Note that 5 V TTL and 3.3 V LVTTL input and output threshold voltages are identical. The difference is the upper range for the allowable high levels.