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MAX5434MEZT Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX5434MEZT Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 17 page 32-Tap, Nonvolatile, I2C, Linear, Digital Potentiometers __________________________________________________________________________ high while SCL is high. The bus is then free for another transmission (Figure 3). Bit Transfer One data bit is transferred during each clock pulse. The data on the SDA line must remain stable while SCL is high (Figure 5). Acknowledge The acknowledge bit is a clocked 9th bit that the recip- ient uses to handshake receipt of each byte of data (Figure 6). Each byte transferred effectively requires 9 bits. The master generates the 9th clock pulse, and the recipient pulls down SDA during the acknowledge clock pulse, so the SDA line is stable low during the high period of the clock pulse. When the master trans- mits to the MAX5432–MAX5435, the devices generate the acknowledge bit because the MAX5432–MAX5435 are the recipients. Slave Address The MAX5432–MAX5435 have a 7-bit-long slave address (Figure 4). The 8th bit following the 7-bit slave address is the NOP/W bit. Set the NOP/W bit low for a write command and high for a no-operation command. Table 1a shows four possible slave addresses for the MAX5432/MAX5433 and Table 1b shows four possible slave addresses for the MAX5434/MAX5435. The first 4 bits (MSBs) of the slave addresses are always 0101. Bits A2 and A1 are factory programmed for the MAX5432/MAX5433 (Table 1a). Connect the A0 input (MAX5432/MAX5433 only) to either GND or VDD to select one of two I2C device addresses. Each device must have a unique address to share the bus. A maxi- mum of four MAX5432/MAX5433 devices can share the same bus. Bits A2, A1, and A0 are factory programmed for the MAX5434/MAX5435 (Table 1b). Message Format for Writing A write to the MAX5432–MAX5435 consists of the trans- mission of the device’s slave address with the 8th bit set to zero, followed by at least 1 byte of information. The 1st byte of information is the command byte. The bytes received after the command byte are the data bytes. The 1st data byte goes into the internal register of the MAX5432–MAX5435 as selected by the command byte (Figure 8). tHD-STA tSU-DAT tHIGH tR tF tHD-DAT tHD-STA S Sr A tSU-STA tLOW tBUF tSU-STO PS tR tF SCL SDA PARAMETERS ARE MEASURED FROM 30% TO 70%. Figure 1. I2C Serial-Interface Timing Diagram ADDRESS BYTE PART SUFFIX A6 A5 A4 A3 A2 A1 A0 NOP/W L 0 1 0 1 0 0 0 NOP/W M 0 1 0 1 1 0 0 NOP/W N 0 1 0 1 0 1 0 NOP/W P 0 1 0 1 1 1 0 NOP/W ADDRESS BYTE PART SUFFIX A6 A5 A4 A3 A2 A1 A0 NOP/W L 0101000 NOP/W L 0101001 NOP/W M 0101100 NOP/W M 0101101 NOP/W Table 1a. Address Codes (MAX5432/MAX5433 Only) Table 1b. Address Codes (MAX5434/MAX5435 Only) |
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