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24C02C-SN Datasheet(PDF) 4 Page - Microchip Technology |
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24C02C-SN Datasheet(HTML) 4 Page - Microchip Technology |
4 / 12 page 24C02C DS21202A-page 4 Preliminary © 1997 Microchip Technology Inc. 2.0 PIN DESCRIPTIONS 2.1 SDA Serial Data This is a bi-directional pin used to transfer addresses and data into and data out of the device. It is an open drain terminal, therefore the SDA bus requires a pull-up resistor to VCC (typical 10 k Ω for 100 kHz, 2 kΩ for 400 kHz). For normal data transfer SDA is allowed to change only during SCL low. Changes during SCL high are reserved for indicating the START and STOP conditions. 2.2 SCL Serial Clock This input is used to synchronize the data transfer from and to the device. 2.3 A0, A1, A2 The levels on these inputs are compared with the cor- responding bits in the slave address. The chip is selected if the compare is true. Up to eight 24C02C devices may be connected to the same bus by using different chip select bit combina- tions. These inputs must be connected to either VCC or VSS. 2.4 WP This is the hardware write protect pin. It must be tied to VCC or VSS. If tied to Vcc, the hardware write protection is enabled. If the WP pin is tied to Vss the hardware write protection is disabled. 2.5 Noise Protection The 24C02C employs a VCC threshold detector circuit which disables the internal erase/write logic if the VCC is below 3.8 volts at nominal conditions. The SCL and SDA inputs have Schmitt trigger and filter circuits which suppress noise spikes to assure proper device operation even on a noisy bus. 3.0 FUNCTIONAL DESCRIPTION The 24C02C supports a bi-directional 2-wire bus and data transmission protocol. A device that sends data onto the bus is defined as transmitter, and a device receiving data as receiver. The bus has to be controlled by a master device which generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions, while the 24C02C works as slave. Both master and slave can operate as trans- mitter or receiver but the master device determines which mode is activated. |
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