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MAX7323 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX7323 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 17 page Any of the four open-drain ports can be configured as a logic input by setting the port output logic-high (logic- high for an open-drain output is high impedance). When the MAX7323 is read through the serial interface, the actual logic levels at the ports are read back. The four ports offer latching transition detection func- tionality. All input ports are continuously monitored for changes. An input change sets 1 of 4 flag bits that identify changed input(s). All flags are cleared upon a subsequent read or write transaction to the MAX7323. A latching interrupt output, INT, automatically flags data changes on any of the I/O ports used as inputs. The interrupt output INT, and all transition flags are deasserted when the MAX7323 is next accessed through the serial interface. Internal pullup resistors to V+ are selected by the address select inputs, AD0 and AD2. Pullups are enabled on the input ports in groups of two (see Table 3). Use the slave address selection to ensure that I/O ports used as inputs are logic-high on power-up. I/O ports with internal pullups enabled default to a logic-high output state. I/O ports with internal pullups disabled default to a logic-low output state. Output port power-up logic states are selected by the address select inputs AD0 and AD2. Ports default to logic-high or logic-low on power-up in groups of two (see Table 3). Initial Power-Up On power-up, the transition detection logic is reset, and INT is deasserted. The interrupt mask register is set to 0x3C, enabling the interrupt output for transitions on all four input ports. The transition flags are cleared to indi- cate no data changes. The power-up default state of the four push-pull outputs is set according to the I2C slave address selection inputs, AD0 and AD2 (see Table 3). Power-On Reset The MAX7323 contains an integral power-on-reset (POR) circuit that ensures all registers are reset to a known state on power-up. When V+ rises above VPOR (1.6V max), the POR circuit releases the registers and 2-wire interface for normal operation. When V+ drops to less than VPOR, the MAX7323 resets all ports to the POR defaults (see Table 3). RST Input The active-low RST input operates as a reset that voids any current I2C transaction involving the MAX7323, forcing the MAX7323 into the I2C STOP condition. The reset action does not clear the interrupt output (INT). Standby Mode When the serial interface is idle, the MAX7323 automat- ically enters standby mode, drawing minimal supply current. I2C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os 6 _______________________________________________________________________________________ PART I2C SLAVE ADDRESS INPUTS INPUT INTERRUPT MASK OPEN- DRAIN OUTPUTS PUSH- PULL OUTPUTS APPLICATION MAX7323 110xxxx Up to 4 — Up to 4 4 4 I/O, 4 output-only versions: 4 open-drain I/O ports with latching transition detection interrupt and selectable pullups. 4 push-pull outputs with selectable power-up default levels. MAX7328 MAX7329 0100xxx 0111xxx Up to 8 — Up to 8 — 8 open-drain I/O ports with nonlatching transition detection interrupt and pullups on all ports. All ports power up as inputs (or logic-high outputs). Any port can be used as an input by setting the open-drain output to logic-high. 16-PORT EXPANDERS MAX7324 8 Yes — 8 Software equivalent to a MAX7320 plus a MAX7319. MAX7325 Up to 8 — Up to 8 8 Software equivalent to a MAX7320 plus a MAX7321. MAX7326 4 Yes — 12 Software equivalent to a MAX7320 plus a MAX7322. MAX7327 101xxxx and 110xxxx Up to 4 — Up to 4 12 Software equivalent to a MAX7320 plus a MAX7323. Table 1. MAX7319–MAX7329 Family Comparison (continued) |
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