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MAX4814E Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX4814E Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 17 page DA1 select the connections of switch A to switch SW_ and inputs DB0 and DB1. Select the connections of switch B to SW_. See Table 3a for the pin configuration and Table 3b for a complete summary. I2C Interface Method (Mode 1) In mode 1, the switch connections are controlled through the I2C interface. Inputs SDA and SCL program registers R0 and R1. Register R0, bits [7 to 2], select the connection of switch A and switch B to switch SW_ (see the I2C Registers and Bit Descriptions section). The bits of register R1 transfer data to the output DO_. The data on output DO_ is used to communicate with the MAX3845. In mode 1, DA0/DO0 becomes output DO0, DA1/DO1 becomes output DO1, DA2/DO2 becomes output DO2, and DB0/DO3 becomes output DO3. DB1 and DB2 are high impedance. See Table 3a for the pin configuration. See Table 4 for register R1 to DO_ output mapping. I2C Registers and Bit Descriptions Two internal registers (RO and R1) program the MAX4814E. Table 2 lists both registers, their address- es, and power-up default states. Both registers are read/write registers. In register R0, bit BAEN is used as the enable for switch A, and bit BBEN is used as the enable for switch B. Writing 1 to bit BAEN enables switch A; and writing 0 to bit BAEN disables switch A. Writing 1 to bit BBEN enables switch B, and writing 0 to bit BBEN disables switch B. BASEL1 and BASEL0 select the connections of switch A to switch SW_, while BBSEL1 and BBSEL0 select the connections of switch B to switch SW_, as summarized in Table 6. I2C Register R0 Two LSB Bits The two LSBs are hard coded as 00. Register R0 ignores any value written to the two LSBs; anytime reg- ister R0 is read the hard-coded values are returned. Bank A Enable (BAEN) and Bank B Enable (BBEN) Bits 1 = Enable 0 = Disable Bank A Select (BASEL1/BASEL0) and Bank B Select (BBSEL1/BBSEL0) Bits Bits BASEL1 and BASEL0 select the switch SW_ that switch A is connected to. Bits BBSEL1 and BBSEL0 select the switch SW_ that switch B is connected to (see Table 6). Power-On Default States When power is applied to the MAX4814E internal power-on reset (POR), circuitry sets registers R0 and R1 to their default states. Register R0 is set to all zeros, or 00h, and register R1 is set to 10101010, or AAh, as shown in Table 2. Having all zeros in register R0 disables both banks A and B; see Table 6 for register R0 to switch mapping. Setting register R1 to AAh forces the outputs at DO_ to be high impedance. Note: The output, DO_ is used to communicate with the MAX3845 when the MAX4814E is being used without its companion. The MAX3845 and the MAX4814E use the I2C interface (MODE = 1). All DO_ outputs need to be connected through a 10kΩ resistor to GND. DVI/HDMI 2:4 Low-Frequency Fan Out Switch 10 ______________________________________________________________________________________ X = Hardwired code, not programmable by user. Table 1. Mode Configuration INPUT PIN MODE OPERATION 0 Puts the device in mode 0. The direct-control inputs DA_ and DB_ control the switches. 1 Puts the device in mode 1. The switches are controlled by the I2C interface. DO_ becomes an active output. Inputs DB1 and DB2 are high impedance. Table 2. I2C Register Map BIT POWER-UP REGISTER 7 6 5 432 1 0 ADDRESS BINARY HEX R0 BBEN BBSE L1 BBSEL0 BAEN BASEL1 BASE L0 X X 0x00 0000 0000 00 R1 DO3 High Impedance DO3 Data DO2 High Impedance DO2 Data DO1 High Impedance DO1 Data DO0 High Impedance DO0 Data 0x01 1010 1010 AA |
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Similar Description - MAX4814E |
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