AT24C32 IC Two-Wire Serial EEPROM

AT 24C32 IC is Serial Electrically Erasable PROM of 4K x 8 (32Kbit). It is specially designed for low power advanced, applications such as personal communications or data acquisition. It is the standard 8-pin plastic DIP, and 8-pin surface mount SOIC packages. 24C32 detail is given below.

AT24C32 Pinout

AT24C32 Pin-out Configuration

Pin NumberPin NameDescription of the pins
1A0User configured pin
2A0User configured same like pin 1
3A0It is also user configured
4Vss (Ground)Connected to the ground
5Serial Data (SDA)This pin is for Serial Data for I2C Communication
6Serial Clock (SCL)Serial Clock pin for I2C Communication data
7WP (Write Protect)If connected to Vss write is enabled and if connected to Vcc write is disabled.
8VccConnect to supply

AT24C32 Specifications and Features

  • Supply Voltage: 1.8V to 5.5V DC
  • Supply Current – Max: 2 MA
  • Memory Size: 4K x 8 (32Kbit)
  • Organization: 4 k x 8=32kbit
  • Interface Type: Serial, 2-Wire and I2C
  • Max Clock Frequency: 40 kHz
  • 32-Byte Page Write Mode feature
  • Self-timed write cycle feature
  • 8-pin PDIP, SOIC and TSSOP available packages

Equivalent Of AT24C32 IC

24LC512, 24C04 are the same as AT24C32

Replacement For AT24C32 IC

You can replace it with EEPROM’S: 24LC1026, AT24C256, 25LC050

How to Use AT24C32 IC

Its interface is very easy you can easily connect it with a microcontroller by using only 5 pins. The interfacing diagram for AT24C32 IC is given below.

How to Use AT24C32 IC

Pin 6 of AT24C32 IC is connected to the Serial clock pin of the microcontroller and the Serial Data pin 5 is connected to the Serial Data pin (SDA) of the microcontroller. The SCK and SDA pins are pulled high using two pull-up resistors (4.7k). This will keep the bus at high state during the off condition.

Select pins A0, A1, and A2 are only useful if more than one EEPROM is connected to the same microcontroller otherwise these pins can be grounded directly. In the above circuit diagram, we have connected the three pins to the PIO pins so that we can use more than one EEPROM IC if required.

Pin 7 is provided for improving data security in the AT24C32 IC. Data can be written/erased only if the WP pin is held low (logic 0). On the other condition the data written on the EEPROM will remain unchanged.

Applications of AT24C32 IC

  • Used in Data Logging
  • Remote storage devices
  • Used in storage devices
  • Audio devices commonly used AT24C32 IC
  • Data analytics can use this ic
  • Flash memory of MCU is less

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