I/O & Pinout

Connector Diagram

DAQAstra Mainboard labels

backofboard

SuperSeal Connector Diagram -- Looking into the connector

board_pinout

34-Pin Connector Pinout

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Pin Number

Pin Name

Description
1 AUX Power

12-32VDC power supply input. Hot-swappable with PoE.
2

+5V

 5VDC, 1A output supply
3

+5V

 5VDC, 1A output supply
4

+12V

 12VDC output supply. 2.5A if using AUX, 1.4A if using PoE
5

+12V

 12VDC output supply. 2.5A if using AUX, 1.4A if using PoE
6 SCL I2C Bus SCL
7 SDA I2C Bus SDA
8 UART RX This is not crossed-over on our side. Connect to another device’s TX pin.
9 UART TX This is not crossed-over on our side. Connect to another device’s RX pin.
10 DO0 0-3V3 sourcing digital-outputs. NOT ISOLATED, DUT must be grounded to DAQAstra. PWM on TIMER 11
11 DO2 PWM on TIMER 4
12 DO4 PWM on TIMER 8
13 DO6 PWM on TIMER 9
14 DO8 PWM on TIMER 2
15 DI0

Digital-Inputs are isolated. Use the jumpers on DAQAstra to use the internal 5V as the open-drain input's logic-high. Use the OPTO selection to use an external voltage, instead. All digital-inputs share the same logic supply.

Add series resistors to current-limit. 500 ohm for 12V, 1000 ohm for 24V.
16 DI2
17 DI4
18 DO1 PWM on TIMER 10
19 DO3 PWM on TIMER 4
20 DO5 PWM on TIMER 9
21 DO7 PWM on TIMER 3
22 DO9 PWM on TIMER 2
23 DI1
24 DI3
25 DI5
26 GND Ground
27 GND Ground
28 GND Ground
29 GND Ground
30 GND Ground
31 GND Ground
32 CANH
33 CANL
34 OPTO External supply for DI pins

26-Pin Connector Pinout

26-pinout

Pin Number

Pin Name

Description

Notes
1 AIN0 Analog-to-Digital Converter Input 0 0 - 5V, 12-bit. Input buffered using voltage-follower.
2 AIN1 Analog-to-Digital Converter Input 1 0 - 5V, 12-bit. Input buffered using voltage-follower.
3 AIN2 Analog-to-Digital Converter Input 2 0 - 5V, 12-bit. Input buffered using voltage-follower.
4 AIN3 Analog-to-Digital Converter Input 3 0 - 5V, 12-bit. Input buffered using voltage-follower.
5 LOAD3 PWR High-Side Solid-State Relay 3 Power Supply

Connect the positive lead of voltage supply to power LOAD3. Must be <50V and external supply GND must be tied to a DAQAstra GND pin.
6 LOAD2 PWR High-Side Solid-State Relay 3 Power Supply

Connect the positive lead of voltage supply to power LOAD2. Must be <50V and external supply GND must be tied to a DAQAstra GND pin.
7 LOAD2- High-Side Solid-State Relay 2 Load Cathode

Switched load negative lead. Optional connection adding a flyback diode to clamp inductive spikes from switched inductive loads.
8 AIN4 Analog-to-Digital Converter Input 4 0 - 5V, 12-bit. Input buffered using voltage-follower.
9 AIN5 Analog-to-Digital Converter Input 5 0 - 5V, 12-bit. Input buffered using voltage-follower.
10 AIN6 Analog-to-Digital Converter Input 6 0 - 5V, 12-bit. Input buffered using voltage-follower.
11 LOAD3+ High-Side Solid-State Relay 3 Load Anode Switched load positive lead.
12 LOAD3- High-Side Solid-State Relay 3 Load Cathode

Switched load negative lead. Optional connection adding a flyback diode to clamp inductive spikes from switched inductive loads.
13 LOAD2+ High-Side Solid-State Relay 2 Load Anode Switched load positive lead.
14 AIN7 Analog-to-Digital Converter Input 7 0 - 5V, 12-bit. Input buffered using voltage-follower.
15 DAC1 Digital-to-Analog Converter Output 1 0-5V or 0-12V, 12-bit analog output. The maximum output voltage is selectable via the DAC VCC jumper on the PCB.
16 DAC2 Digital-to-Analog Converter Output 2

0-5V or 0-12V, 12-bit analog output. The maximum output voltage is selectable via the DAC VCC jumper on the PCB. The jumper controls both DAC channels.
17 LOAD0- Low-Side Solid-State Relay 0 Load Cathode Switched load negative lead.
18 LOAD0+ Low-Side Solid-State Relay 0 Load Anode

Switched load positive lead. Optional connection adding a flyback diode to clamp inductive spikes from switched inductive loads.
19 LOAD1- Low-Side Solid-State Relay 1 Load Cathode Switched load negative lead.
20 GND GND
21 GND GND
22

+5V

 5V DC Output Power 1.5A PTC Polyfuse in series with output. Voltage supply limited to continuous drain of 1A.
23

+12V

 12V DC Output Power This rail has OVP, UVLO, and OCP. Limited to 2.5A.
24 LOAD0 GND Low-Side Solid-State Relay 0 Supply GND

Connect the negative lead of voltage supply to power LOAD0. Must be <50V and external supply GND must also be tied to a DAQAstra GND pin.
25 LOAD1 GND Low-Side Solid-State Relay 1 Supply GND

Connect the negative lead of voltage supply to power LOAD1. Must be <50V and external supply GND must also be tied to a DAQAstra GND pin.
26 LOAD1+ Low-Side Solid-State Relay 1 Load Anode

Switched load positive lead. Optional connection adding a flyback diode to clamp inductive spikes from switched inductive loads.

Pinout Legend

SuperSeal Pinout Legend

Power Outputs

  • +5V**:** protected by a PTC resettable fuse rated at 1.5A. Generally used for power sensors or external modules.
  • +12V: protected by a power-management integrated-circuit (PMIC), preventing current draw over 2.5A.

DAC - Digital-to-Analog Converter:

  • Allows for the DAQAstra’s microcontroller to provide analog signals (e.g. a feedback control signal)
  • The DAC can drive up to 60mA and features a low-pass filter with a 3dB cutoff at 160kHz. 
  • Outputs an analog voltage ranging from 0-12V with 12-bit/3 millivolt accuracy.
  • The DAC is often used as a control-signal output for other controllers, like a mass-flow controller or DC-Motor drive. They are also often used in audio reproduction or as waveform generators.

AIN - Analog-to-Digital Converter:

  • Allows for the DAQAstra’s microcontroller to read analog signals (e.g. transduced audio or temperature signals).
  • All analog signals read through the SuperSeal are buffered by a unity-gain op-amp, providing stability in the measurement. 
  • Reads an analog voltage ranging from 0-5V with 12-bit accuracy, or 4096 1.2 millivolt steps across the measurement range.
  • The firmware oversamples the 12-bit samples to achieve 16-bit data. This is often used for measuring analog information about the environment (temperature, humidity, pressure).

PLCIN - Isolated PLC Digital Input:

  • Electrically isolated input, designed for -60–60V  Discrete inputs, such as the 24V I/O often found on PLCs.
  • Up to 4Mbps data rate

CAN Bus:

  • Controller Area Network bus differential inputs (CAN_P and CAN_N), connected to a CAN Transceiver.
  • Offers up to 1Mbps data rate.

DIO - Digital Input/Output:

  • Sends or receives digital logic signals in 5VTTL. There are ten DIO pins, all capable of acting as either an input or output. All GPIO from the DAQAstra are protected via a level-shifter.
  • NOTE: The level shifters that interface between the microcontroller and I/O pins do not drive the outputs to GND when the microcontroller pins are not driven (e.g. the board firmware is changing, or the board is disconnected). In this state, the outputs are High-Z (floating).

LOWSIDE - Solid-State Relay

  • An array of four Gate Driver ICs, each connected to an N-Channel MOSFET. Acts by connecting/disconnecting a load’s current return to ground. Features a TVS diode in parallel with the MOSFET, allowing for overvoltage protection and safe connection of inductive loads.
  • Rated for ~2A continuous current and up to 10A pulsed current.
  • Users can choose between connecting the high side of their load to the board’s internal 12V output, or an external output. In the former case, GNDPWR and GND must be connected (as the Lowside switches use GNDPWR as their return). This is done by shorting the pins on the GND Isolation Jumper, shown in the board render above.

Auxiliary Power Input

  • Auxiliary power enters from the 2-Terminal Female Input and is converted to Regulated 12V, via a switching converter.  An Integrated Circuit switches between a supply voltage from PoE and the regulated 12V Auxiliary. 
  • The pin closest to the pin-one indicator is the VCC pin. The other is GND.