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CAT9555WI-T1 Datasheet(PDF) 7 Page - Catalyst Semiconductor |
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CAT9555WI-T1 Datasheet(HTML) 7 Page - Catalyst Semiconductor |
7 / 17 page CAT9555 7 Doc. No. 8551, Rev. E © 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice A0, A1, A2: Device Address Inputs These inputs are used for extended addressing capabil- ity. The A0, A1, A2 pins should be hardwired to VCC or VSS. When hardwired, up to eight CAT9555s 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/O 0.0 to I/O 0.7, I/O 1.0 to I/O 1.7: Input / Output Ports Any of these pins may be configured as input or output. The simplified schematic of I/Os 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 100 kohm). 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 be- tween the pin and either VCC or VSS. 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). Figure 2. Minimum Rp as a Function of Supply Voltage (IOL = 3mA @ VOL max) Figure 3. Maximum Rp Value versus Bus Capacitance (Fast Mode I2C Bus / tr max = 300ns) 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. 2.5 2 1.5 1 0.5 0 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6 VCC (V) 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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