24C32 CMOS I²C 2-WIRE BUS

The Turbo IC 24C32 is a serial 32K EEPROM fabricated with Turbo’s proprietary, high reliability, high performance CMOS technology. It’s 32K of memory is organized as 4,096x 8 bits. The memory is configured as 256 pages with each page containing 32 bytes. This device offers significant advantages in low power and low voltage applicaTIons.The Turbo IC 24C32 uses the extended I²C addressing protocol and 2-wire serial interface which includes a bidirecTIonal serial data bus synchronized by a clock. It offers aflexible byte write and a faster 32-byte page write. The data in the upper quadrant of memory can be protected by a write protect pin.The Turbo IC 24C32 is assembled in either a 8-pin PDIP or8-pin SOIC package. Pin #1 (A0), #2 (A1), and #3 (A2) aredevice address input pins which are hardwired by the user.Pin #4 is the ground (Vss). Pin #5 is the serial data (SDA)pin used for bidirecTIonal transfer of data. Pin #6 is the serialclock (SCL) input pin. Pin #7 is the write protect (WP) inputpin, and Pin #8 is the power supply (Vcc) pin.All data is serially transmitted in bytes (8 bits) on the SDAbus. To access the Turbo IC 24C32 (slave) for a read or writeoperaTIon, the controller (master) issues a start condition bypulling SDA from high to low while SCL is high. The masterthen issues the device address byte which consists of 1010(A2) (A1) (A0) (R/W). The 4 most significant bits (1010) are a device type code signifying an EEPROM device. The A[2:0] bits represent the input levels on the 3 device address input pins. The read/write bit determines whether to do a read or write operation. After each byte is transmitted, the receiver has to provide an acknowledge by pulling the SDA bus low on the ninth clock cycle. The acknowledge is a handshake signal to the transmitter indicating a successful data transmission.