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MAX7300ATL Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX7300ATL Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 20 page MAX7300 is the recipient. When the MAX7300 is transmitting to the master, the master generates the acknowledge bit since the master is the recipient. Slave Address The MAX7300 has a 7-bit-long slave address (Figure 6). The eighth bit following the 7-bit slave address is the RW bit. It is low for a write command and high for a read command. The first 3 bits (MSBs) of the MAX7300 slave address are always 100. Slave address bits A3, A2, A1, and A0 are selected by the address inputs, AD1 and AD0. These two input pins can be connected to GND, V+, SDA, or SCL. The MAX7300 has 16 possible slave addresses (Table 3), and therefore a maximum of 16 MAX7300 devices can share the same interface. Message Format for Writing the MAX7300 A write to the MAX7300 comprises the transmission of the MAX7300’s slave address with the R/W bit set to zero, followed by at least 1 byte of information. The first byte of information is the command byte. The com- mand byte determines which register of the MAX7300 is to be written by the next byte, if received. If a STOP condition is detected after the command byte is received, then the MAX7300 takes no further action (Figure 7) beyond storing the command byte. Figure 1. MAX7300 Functional Diagram SLAVE ADDRESS BYTE D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 R/W 8 8 CE DATA 8 SDA SCL PORT REGISTERS GPIO CONFIGURATION P4 TO P31 ADDRESS MATCHER AD0 AD1 COMMAND BYTE DATA BYTE R/W 7-BIT DEVICE ADDRESS 7 7 TO COMMAND REGISTERS TO/FROM DATA REGISTERS GPIO DATA R/W CONFIGURATION REGISTERS PORT CHANGE DETECTOR MASK REGISTER COMMAND REGISTER DECODE 8 DATA BYTE COMMAND BYTE www.maximintegrated.com Maxim Integrated │ 8 MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander |
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