DIGI POT 11 Click Board™

Product Code: MIKROE-5318

How Does The DIGI POT 11 Click Board™ Work? The DIGI POT 11 Click Board™ is based on dual MAX5387, a dual volatile, low-voltage linear taper digital potentiometers from Analog Devices, with four digitally controlled potentiometers, are realized with end-to-end resistance values of 50kΩ. The potentiometers consist of 255 fixed resistors in series between appropriate H and L terminals, providing a low 35ppm/ºC end-to-end temperature coefficient. The potentiometer wiper (W) terminals are programmable to access any one of the 256 tap points on the resistor string. The DIGI POT 11 Click Board™ communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of 400kHz. The potentiometers are programmable independently of each other. The MAX5387 has a 7-bit slave address with the first five MSBs fixed to 01010. The address pins A0 and A1 of both potentiometers are programmed by the user and determine the value of the last three LSBs of the slave address, which can be selected by positioning onboard SMD jumpers labelled as ADDR SEL, in U1 or U2 part, to an appropriate position marked as 0 or 1.

The I2C interface contains a shift register that decodes the command and addresses bytes, routing the data to the appropriate control registers. Data written to a control register immediately updates the wiper position. In the beginning, wipers A and B always power up in mid-position. The DIGI POT 11 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Digital potentiometer Applications Can be used as a mechanical potentiometer replacement for the portable consumer market and battery-backup industrial applications On-board modules MAX5387 - dual volatile linear taper digital potentiometer from Analog Devices Key Features Double dual potentiometers, 256-tap linear taper positions, single 3.3V supply, low power consumption, 50kΩ end-to-end resistance, I2C interface, Power-On sets wiper to midscale, and more Interface I2C Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V PINOUT DIAGRAM This table shows how the pinout of the DIGI POT 11 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 NC Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator JP1-JP4 ADDR SEL Left I2C Address Selection 0/1: Left position 0, Right position 1 J1-J4 U1-U2 Populated DIGI POT Header Terminals DIGI POT 11 CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit Supply Voltage - 3.3 - V End-to-end Resistance - - 50 kΩ