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MAX7321 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX7321 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 15 page case of a bus lockup, terminating any serial transaction to or from the MAX7321. Any port 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 MAX7321 is read through the serial interface, the actual logic levels at the ports are read back. The open-drain ports offer latching transition detection when used as inputs. All input ports are continuously monitored for changes. An input change sets 1 of 8 flag bits that identify changed input(s). All flags are cleared upon a subsequent read or write transaction to the MAX7321. A latching interrupt output (INT) is programmed to flag logic changes on ports used as inputs. Data changes on any input port forces INT to a logic-low. Changing the I/O port level through the serial interface does not cause an interrupt. The interrupt output INT is deassert- ed when the MAX7321 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 four (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. 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 four (see Table 3). Initial Power-Up On power-up, the transition detection logic is reset, and INT is deasserted. The transition flags are cleared to indicate no data changes. The power-up default states of the eight I/O ports are set according to the I2C slave address selection inputs, AD0 and AD2 (Table 3). For I/O ports used as inputs, ensure that the default states are logic-high so that the I/O ports power up in the high-impedance state. All I/O ports configured with pullups enabled also have a logic-high power-up state. Power-On Reset The MAX7321 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 MAX7321 resets all register contents to the POR defaults (Table 3). Table 1. MAX7319–MAX7329 Family Comparison (continued) 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 101xxxx And 110xxxx 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 Up to 4 — Up to 4 12 Software equivalent to a MAX7320 plus a MAX7323. www.maximintegrated.com Maxim Integrated │ 6 MAX7321 I2C Port Expander with 8 Open-Drain I/Os |
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