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LJTick-LVDigitalIO

A bidirectional logic shifting board for converting 3.3V logic down to 2.5V or 1.8V. There is also a VOUT terminal which can source power at the selected voltage. Useful for users who have external boards that run on lower logic thresholds, or simply want a 3.3V, 2.5V, or 1.8V supply. The logic terminals presented on this accessory board are for communication purposes only, they cannot drive relays or other forms of load.



  • Supports bi-directional communication

  • Up to 800kHz

  • 3.3V, 2.5V, or 1.8V

  • VOUT terminal can source up to 200mA


Note: Advanced users may convert the 1.8V option to 5V by installing a jumper on R5, and removing or destroying U3.

Details

Details

The LJTick-LVDigitalIO (LJT-LVDIO) A bidirectional logic shifting board for converting 3.3V logic down to 2.5V or 1.8V. There is also a VOUT terminal which can source power at the selected voltage. Useful for users who have external boards that run on lower logic thresholds, or simply want a 3.3V, 2.5V, or 1.8V supply.

  • Supports bi-directional communication
  • Up to 800kHz
  • 3.3V, 2.5V, or 1.8V
  • VOUT terminal can source up to 200mA

Note: Advanced users may convert the 1.8V option to 5V by installing a jumper on R5, and removing or destroying U3.

Common Applications

  • Communicating with SPI, I2C, UART, 1-Wire, and other Digital IO sensors that require a supply voltage that is the same voltage as the logic level.

Figure 1: LJTick-LVDigitalIO

LJTick-LVDigitalIO with U3-LV USB Data Acquisition (DAQ) and Control Device

Figure 2: LJTick-LVDigitalIO with U3-LV

Screw Terminal Descriptions

Vout: This voltage can be selected to be either 3.3V, 2.5V, or 1.8V with the slide switch.

GND: Same as LabJack ground (GND).

DIOA/DIOB: These logic input and output lines can be configured to communicate with 3.3V, 2.5V, or 1.8V circuitry.


LJTick-LVDigitalIO Schematic

LJTick-LVDigitalIO Schematic

Figure 3: LJTick-LVDigitalIO Schematic


Specifications

For more specifications about the MOSFETs and voltage regulators used in the LJTick-LVDigitalIO look at the following datasheets:


  Product Comparison

U12 U3-LV U3-HV U6 U6-Pro UE9 UE9-Pro T7 T7-Pro
AIN Voltage ±10V 0-2.4V ±10V [1] ±10V ±10V ±5V ±5V ±10V ±10V
Analog Inputs 8 16 16 14 14 14 14 14 14
Effective Resolution [2] 12 bit 12 bit 12 bit 16 bit 22 bit 12 bit 20 bit 16 bit 22 bit
Digital I/O 20 20 16 20 20 23 23 23 23
Logic Level 5V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V
Analog Outputs 2 2 2 2 2 2 2 2 2
Counters 1 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 10 Up to 10
USB Yes Yes Yes Yes Yes Yes Yes Yes Yes
LJTick Compatible No Yes Yes Yes Yes Yes Yes Yes Yes
Internal Temp Sensor No Yes Yes Yes Yes Yes
Yes
Yes Yes
Thermocouple Ready [3] No No No Yes Yes No Yes Yes Yes
Ethernet No No No No No Yes Yes Yes Yes
Scripting No No No No No No No Yes Yes
Wireless No No No No No No No No Yes
Real-time Clock No No No No No No No No Yes
[1] Can be configured for -10V to +20V range.
[2] According to actual measured data, see related Noise and Resolution (App Note)
[3] If not thermocouple ready, can purchase an amplifier like the LJTick-InAmp, see related Thermocouples (App Note)