MAX7323 Maxim, MAX7323 Datasheet
MAX7323
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MAX7323 Summary of contents
Page 1
... I/O ports, and enables or disables internal 40kΩ pullups for the input ports in groups of two ports. The MAX7323 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain I/O ports, and push-pull output ports (see Table 1). ...
Page 2
... Total V+ Current..................................................................50mA Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...
Page 3
I C Port Expander with 4 Push-Pull Outputs PORT AND INTERRUPT INT TIMING CHARACTERISTICS (V+ = +1.71V to +5.5V -40°C to +125°C, unless otherwise noted. Typical values are +3.3V PARAMETER SYMBOL Port ...
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I C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/ +25°C, unless otherwise noted.) A STANDBY CURRENT vs. TEMPERATURE 2.0 1.8 1.6 1.4 1.2 1 +3. +2.5V 0.8 0.6 0.4 0.2 ...
Page 5
... I/O ports with a 20mA sink capability. The four open-drain outputs are overvoltage protected to +6V independent of supply voltage. The MAX7323 is set to one (0x60 to 0x6F) using the address select inputs AD0 and AD2, and is accessed over an I 400kHz. The RST input clears the serial interface in case of a bus lockup, terminating any serial transaction to or from the MAX7323 ...
Page 6
... The active-low RST input operates as a reset that voids any current I forcing the MAX7323 into the I reset action does not clear the interrupt output (INT). When the serial interface is idle, the MAX7323 automati- cally enters standby mode, drawing minimal supply current. APPLICATION ...
Page 7
... Also, if SDA and SCL are terminated with pullup resistors to a different supply voltage than the MAX7323’s supply voltage, and if that pullup supply rises later than the MAX7323’s supply, then SDA or SCL may appear at power- connected to GND. In such applications, use the four address combinations ...
Page 8
... Write 1 byte to the MAX7323 to set the output port lev- els for the four push-pull outputs, and the four open- drain I/O ports simultaneously. ...
Page 9
... The master initiates all data trans- fers to and from the MAX7323 and generates the SCL clock that synchronizes the data transfer (Figure 1). SDA operates as both an input and an open-drain out- put. A pullup resistor, typically 4.7kΩ ...
Page 10
... A single-byte write to the MAX7323 sets the logic state of the four open-drain I/O ports and four push-pull outputs 2-byte write to the MAX7323, the first byte sets the logic state of the four open-drain I/O ports and four push-pull outputs, while the second byte sets the inter- rupt mask bits for the four open-drain I/O ports ...
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... SCL PORT I INT OUTPUT Figure 6. Reading the MAX7323 (1 Data Byte MAX7321 SLAVE ADDRESS SCL PORTS t IV INT OUTPUT Figure 7. Reading the MAX7323 (2 Data Bytes) ______________________________________________________________________________________ and 4 Open-Drain I/ R/W PORT SNAPSHOT INT REMAINS HIGH UNTIL STOP CONDITION ...
Page 12
... INT goes high (high impedance if an external pullup resistor is not fitted) during the slave acknowledge. The master can now transmit 1 or more bytes of data. The MAX7323 acknowledges these subsequent bytes of data and updates the interrupt mask register with each new byte until the master issues a STOP condition (Figure 8) ...
Page 13
... When driving LEDs from one of the four output ports (O0, O1, O6, or O7), a resistor must be connected in series with the LED to limit the LED current to no more than 20mA. Connect the LED cathode to the MAX7323 port, and the LED anode to V+ through the series cur- rent-limiting resistor, R ...
Page 14
... Any combi- nation of outputs can be used as part of a load-sharing design because any combination of ports can be set or cleared at the same time by writing to the MAX7323. Do not exceed a total sink current of 100mA for the device. + The MAX7323 must be protected from the negative volt- ...
Page 15
... I C Port Expander with 4 Push-Pull Outputs (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ and 4 Open-Drain I/Os Package Information 15 ...
Page 16
... I C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) E MARKING E/2 AAAA D 0. ______________________________________________________________________________________ Package Information (continued) ( ...
Page 17
... Pages changed at Rev 1: Title change—all pages, 1–17 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...