Digilent MCC 152 – 12-Bit Analog Voltage Output & DIO DAQ HAT for Raspberry Pi

• Two 12-bit simultaneous voltage outputs
• 5 mA output drive, sourcing
• 0.8 V/μs slew rate
• Eight bidirectional digital bits

The Measurement Computing MCC 152 is a voltage output and digital input/output HAT (Hardware Attached on Top) designed for use with Raspberry Pi®. The MCC 152 provides two 12-bit analog outputs with a 0 V to 5 V output range and 5 mA output drive, sourcing. Both outputs can be updated simultaneously with software. It provides eight bidirectional digital bits. Each digital bit is configurable for pull-up or pull-down or can be disabled. Each output bit can source 10 mA and sink 25 mA. Users can configure the software to generate an interrupt when the state of a digital input bit changes. The MCC 152 can interface with 3.3 V or 5 V logic types. The input polarity is software programmable for normal (active high, default) or inverted logic (active low).

HAT configuration parameters are stored in an onboard EEPROM that allows the Raspberry Pi to automatically set up the GPIO pins when the HAT is connected. The open-source MCC DAQ HAT Library of commands in C/C++ and Python allows users to develop applications on the Raspberry Pi using Linux. The MCC DAQ HAT Library supports operation with multiple MCC DAQ HATs running concurrently. Console-based and user interface (UI) example programs are available for each API.

Screw Terminals

• AO0 to AO1 (AOx): Analog output terminals.
• DIO0 to DIO7 (DIOx): Digital input/output terminals.
• VIO (VIO): Digital I/O supply voltage (5 V or 3.3 V, selectable with jumper W3.)
• AGND (AGND): Common ground for the analog output terminals.
• DGND (DGND): Common ground for the digital I/O terminals.

Address Jumpers

• A0 to A2: Used to identify each DAQ HAT when multiple boards are connected. The first DAQ HAT connected to the Raspberry Pi must be at address 0 (no jumper). Install jumpers on each additional connected board to set the desired address.

DIO Power jumper (W3)

5V and 3.3V: Selects the DIO voltage; the factory default is 5 V.

Status LED

The LED turns on when the board is connected to a Raspberry Pi with external power applied.

Header Connector

The board header is used to connect with the Raspberry Pi.

Mixing 3.3V and 5V Digital Inputs

The MCC 152 digital inputs are tolerant of 5V signals when the DIO is set to 3.3V operation with jumper W3. However, the current can flow into the MCC 152 from the 5V signal, so the user must limit this current to avoid raising the voltage of the digital power supply rail (VIO) and possibly damaging components. MCC recommends using a series resistor of 700 ohms or larger.