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CAT24FC32AWTE13 데이터시트(PDF) 6 Page - Catalyst Semiconductor |
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CAT24FC32AWTE13 데이터시트(HTML) 6 Page - Catalyst Semiconductor |
6 / 12 page CAT24FC32A 6 Doc. No. 1048, Rev. F WP: Write Protect This input controls the device write protect feature. WP pin connected to VSS allows write operations to the entire memory. When this pin is connected to Vcc, the entire memory is write protected. When left floating, an internal pull-down resistor on this input will keep the memory unprotected. Read operations are not affected. A0, A1, A2: Device Address Inputs These inputs are used for extended addressing capability. The A0, A1, A2 pins can be hardwired to VCC or VSS, or left unconnected. When hardwired, up to eight CAT24FC32As may be addressed on a single bus system. When the pins are left unconnected, the default values are zero. The levels on these inputs are compared with corresponding bits, A2, A1, A0, from the slave address byte. PIN DESCRIPTION SCL: Serial Clock The serial clock input clocks all data transferred into or out of the device. The SCL line requires a pull-up resistor if it is driven by an open drain output. SDA: Serial Data/Address The bidirectional serial data/address pin is used to transfer all data into and out of the device. The SDA pin is an open drain output and can be wire-ORed with other open drain or open collector outputs. A pull-up resistor must be connected from SDA line to Vcc. The value of the pull-up resistor, Rp, can be calculated based on minimum and maximum values from Figure 4 and Figure 5. (see Note). Figure 4 Figure 5 Note: According to the Fast Mode I2C bus specification, for bus capacitance up to 200pF, the pull up device can be a resistor. For bus loads between 200pF and 400pF, the pull-up device can be a current source (Imax=3mA) or a switched resistor circuit. Minimum RP as a Function of Supply Voltage (IOL = 3mA @ VOLmax) 1 0.5 0 1.6 2 2.4 2.8 3.2 3.6 VCC (V) Minimum RP Value versus Bus Capacitance (Fast Mode I2C Bus / tr max = 300ns) 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 50 100 150 200 250 300 350 400 Cbus (pF) |
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