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MAX7327AATG+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX7327AATG+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 21 page I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os _______________________________________________________________________________________ 9 PIN CONNECTION DEVICE ADDRESS OUTPUTS POWER-UP DEFAULT AD2 AD0 A6 A5 A4 A3 A2 A1 A0 O15 O14 O13 O12 O11 O10 O9 O8 SCL GND 10 100 00 11 11 00 00 SCL V+ 10 100 01 11 11 11 11 SCL SCL 10 100 10 11 11 11 11 SCL SDA 10 100 11 11 11 11 11 SDA GND 10 101 00 11 11 00 00 SDA V+ 10 101 01 11 11 11 11 SDA SCL 10 101 10 11 11 11 11 SDA SDA 10 101 11 11 11 11 11 GND GND 10 110 00 00 00 00 00 GND V+ 10 110 01 00 00 11 11 GND SCL 10 110 10 00 00 11 11 GND SDA 10 110 11 00 00 11 11 V+ GND 10 111 00 11 11 00 00 V+ V+ 1 0 111 0 1 11 11 1 11 1 V+ SCL 10 111 10 11 11 11 11 V+ SDA 10 111 11 11 11 11 11 Table 3. MAX7327 Address Map for Outputs O8–O15 I/O Port Inputs I/O port inputs switch at CMOS logic levels as deter- mined by the expander’s supply voltage, and are over- voltage tolerant to +6V, independent of the expander’s supply voltage. I/O Port Input Transition Detection All I/O ports configured as inputs are monitored for changes since the expander was last accessed through the serial interface. The state of the ports is stored in an internal “snapshot” register for transition monitoring. The snapshot is continuously compared with the actual input conditions, and if a change is detected for any port input, INT is asserted to signal a state change. The input ports are sampled (internally latched into the snapshot register) and the old transi- tion flags cleared during the I2C acknowledge of every MAX7327 read and write access. The previous port transition flags are read through the serial interface as the second byte of a 2-byte read sequence. A long read sequence (more than 2 bytes) can be used to poll the expander continuously without the overhead of resending the slave address. If more than 2 bytes are read from the expander, the expander repeatedly returns the 2 bytes of input port data followed by the transition flags. The inputs are repeatedly resampled and the transition flags repeatedly reset for each pair of bytes read. All changes that occur during a long read sequence are detected and reported. The INT output is not reasserted during a read sequence to avoid recursive reentry into an interrupt service routine. Instead, if a data change occurs that would normally cause the INT output to be set, the INT assertion is delayed until the STOP condition. INT is not reasserted upon a STOP condition if the changed input data is read before the STOP occurs. The INT logic ensures that unnecessary interrupts are not asserted, yet data changes are detected and reported no matter when the change occurs. |
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