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1, Onboard 8P chip holder, install AT24C256 chip.
2, pin power supply, on-board power display.
3, Onboard I2C communication requires pull-up resistor.
4, All pins are drawn and marked, enter the address and write protection pin can be directly jumper settings.
5, PCB board size: 36.5*12mm.
6, 32k x 8 storage units can be formed internally.
7, 2-wire serial interface.
8, Schmitt trigger, filter input to suppress noise.
9, two-way data transfer protocol.
10,Hardware write protection pin and software data protection function Has a 64-byte page write mode.
The chip has 3 working voltages:
5.0V(VCC=4.5-5.5V)
2.7V(Cc=2.7V-5.5V)
1.8V(VC=1.8-3.6V)
A0、A1: address selection input. In the serial bus structure, there are four AT24C256IC can beconnected. Use A0 and A1 to distinguish each IC. A1 is 0 when floating.
SCL: Serial Clock lnput. The rising edge writes the data on SDA into the memory, and the falling edge reads the data from the memory and sends it to SDA.
SDA: bidirectional serial data input and output port. For data exchange between memory and microcontroller.
WP: Write Protect lnput. When this pin is connected to ground, write operations areallowed; when connected to VCC, all write memory operations are disabled. lf notconnected, the chip is internally pulled down to ground.
VCC: Power
GND: Ground
NC: Empty
Package included:
3 x AT24C256 I2C interface EEPROM memory module
T
Reviewed in the United States on July 9, 2024
I can see the AT24 series is popular for a reason, tried and true. This package is nice since it already includes the necessary pullup resistors to interface with the AT24C256 chip. I'm still pretty new to programming, but it wasn't too difficult to rig this up (by following a tutorial) and write some data. Opens up a lot of possibilities for MCUs with limited EEPROM even if it's slower -- 256kb here vs 1kb for the ATmega328P in an UNO R3 for example.
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