Expand 12 Click Board™

Product Code: MIKROE-4889

How Does The Expand 12 Click Board™ Work? The Expand 12 Click Board™ as its foundation uses the MAX7300, a general-purpose input/output (GPIO) expander from Maxim Integrated, now part of Analog Devices. This port expander is a simple solution when additional I/Os are needed while keeping interconnections to a minimum, particularly great for system monitoring applications, industrial controllers, portable equipment, and others. The MAX7300 comes in a 28-port configuration, which can be configured to any combination of logic inputs and logic outputs, and default to logic inputs on Power-Up. Any I/O port can be configured as a push-pull output (sinking 10mA, sourcing 4.5mA) or a Schmitt-trigger logic input. Each input has an individually selectable internal pull-up resis­tor. Additionally, transition detection allows seven ports (from port 24 up to port 30) to be monitored in any maskable combina­tion for changes in their logic status. A detected transition is flagged through a status register bit, as well as an interrupt pin (port 31) if desired.

The Expand 12 Click Board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings with a maximum frequency of 400kHz. Besides, it also allows the choice of the least significant bit of its I2C slave address by positioning the SMD jumpers labeled as ADDR SEL to an appropriate position marked as 1 and 0. This way, the MAX7300 provides the opportunity of the 16 possible different I2C addresses by positioning the SMD jumper to an appropriate position. The Expand 12 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the I2C communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Port expander Applications Can be used in system monitoring applications, industrial controllers, portable equipment, and many more On-board modules MAX7300 - general-purpose input/output (GPIO) expander from Maxim Integrated, now part of Analog Devices Key Features Remote I/O pins that default to inputs at Power-Up, compliant with the I2C-bus Fast and Standard modes, 5V tolerant I/Os, sinking 10mA and sourcing 4.5mA, programmable slave addresses, and more Interface I2C Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout on the Expand 12 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NC NC 2 RST INT 15 NC NC 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 SCL I2C Clock NC 6 MOSI SDA 11 SDA I2C Data Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator JP1 VCC SEL Left Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V JP2-JP3 ADDR SEL Left I2C Address Selection 1/0: Left position 1, Right position 0 J1-J4 4-31 Populated I/O Expander Ports EXPAND 12 CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit