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ST14C02C Arkusz danych(PDF) 3 Page - STMicroelectronics |
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ST14C02C Arkusz danych(HTML) 3 Page - STMicroelectronics |
3 / 12 page 3/12 ST14C02C Figure 4. Maximum RL Value versus Bus Capacitance (CBUS) for an I 2C Bus AI01100 VCC CBUS SDA RL MASTER RL SCL CBUS 100 200 300 400 0 4 8 12 16 20 CBUS (pF) VCC = 5V SIGNAL DESCRIPTION Serial Clock (SCL) The SCL input pin is used to synchronize all data in and out of the memory. A pull up resistor can be connected from the SCL line to VCC. (Figure 4 in- dicates how the value of the pull-up resistor can be calculated). Serial Data (SDA) The SDA pin is bi-directional, and is used to trans- fer data in or out of the memory. It is an open drain output that may be wire-OR’ed with other open drain or open collector signals on the bus. A pull up resistor must be connected from the SDA bus to VCC. (Figure 4 indicates how the value of the pull-up resistor can be calculated). Mode (MODE) The MODE input may be driven dynamically. It must be held at: s VIL or VIH for the Byte Write mode s VIH for Multibyte Write mode s VIL for Page Write mode When unconnected, the MODE input is internally read as a VIH (Multibyte Write mode). Note that the voltages are CMOS levels, and are not TTL com- patible. On the D15 micromodule, the MODE pin is not connected to a contact. This pin is left floating on the silicon. This type of ST14C02C is always in its MultiByte mode, and cannot be changed from this. DEVICE OPERATION The memory device supports the I2C protocol, as summarized in Figure 5. Any device that sends data on to the bus is defined to be a transmitter, and any device that reads the data to be a receiv- er. The device that controls the data transfer is known as the master, and the other as the slave. A data transfer can only be initiated by the master, which will also provide the serial clock for synchro- nization. The memory device is always a slave de- vice in all communication. Table 3. Endurance and Data Retention Device Endurance (Erase/Write Cycles) Data Retention (Years) ST14C02C 1,000,000 10 |
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