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CAT9554AWI-G Datasheet(PDF) 6 Page - ON Semiconductor |
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CAT9554AWI-G Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 16 page CAT9554, CAT9554A Doc. No. MD-9002 Rev. F 6 © 2008 SCILLC. All rights reserved Characteristics subject to change without notice 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 2 and Figure 3 (see Note). A0, A1, A2: Device Address Inputs These inputs are used for extended addressing capability. The A0, A1, A2 pins should be hardwired to VCC or VSS. When hardwired, up to eight CAT9554/9554As may be addressed on a single bus system. The levels on these inputs are compared with corresponding bits, A2, A1, A0, from the slave address byte. I/O0 to I/O7: Input / Output Ports Any of these pins may be configured as input or output. The simplified schematic of I/O0 to I/O7 is shown in Figure 4. When an I/O is configured as an input, the Q1 and Q2 output transistors are off creating a high impedance input with a weak pull-up resistor (typical 100k Ω). If the I/O pin is configured as an output, the push-pull output stage is enabled. Care should be taken if an external voltage is applied to an I/O pin configured as an output due to the low impedance paths that exist between the pin and either VCC or VSS. Figure 2. Minimum RP Value versus Supply Voltage Figure 3. Maximum RP Value versus Bus Capacitance 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. IOL = 3mA @ VOLmax VCC (V) 2 2.5 1.5 1 0.5 0 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 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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