Shanghai Belling Corp., Ltd

BL24C02/04/08/16

3

DEVICE/PAGE ADDRESSES (A2, A1 and A0): The A2, A1 and A0 pins are device address inputs that

are hard wired for the BL24C02. Eight 2K devices may be addressed on a single bus system (device

addressing is discussed in detail under the Device Addressing section).

The BL24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4K devices may be

addressed on a single bus system. The A0 pin is a no connect and can be connected to ground.

The BL24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be

addressed on a single bus system. The A0 and A1 pins are no connects and can be connected to

ground.

The

BL24C16 does not use the device address pins, which limits the number of devices on a single bus

to one. The A0, A1 and A2 pins are no connects and can be connected to ground.

SERIAL DATA (SDA): The SDA pin is bi-directional for serial data transfer. This pin is open-drain driven

and may be wire-ORed with any number of other open-drain or open- collector devices.

SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device

and negative edge clock data out of each device.

WRITE PROTECT (WP): The BL24C02/BL24C04/BL24C08/BL24C16 has a Write Protect pin that

provides hardware data protection. The Write Protect pin allows normal read/write operations when

connected to ground (GND). When the Write Protect pin is connected to VCC, the write protection feature

is enabled and operates as shown in the following Table 2.

Part of the Array Protected

WP Pin Status:

BL24C02

BL 24C04

BL 24C08

BL 24C16

At V

CC

Full (2K)

Array

Full (4K)

Array

Full (8K)

Array

Full (16K) Array

At GND

Normal Read/Write Operations

Memory Organization

BL24C02, 2K SERIAL EEPROM: Internally organized with 32 pages of 8 bytes each, the 2K requires an

8-bit data word address for random word addressing.

BL24C04, 4K SERIAL EEPROM: Internally organized with 32 pages of 16 bytes each, the 4K requires a

9-bit data word address for random word addressing.

BL24C08, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes each, the 8K requires a

10-bit data word address for random word addressing.

BL24C16, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes each, the 16K