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LJTick-LVDigitalIO Datasheet

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 the voltage regulator marked U3. Instructions for doing this can be found on the modifying the LJTick-LVDigitalIO page.

Subsections

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

Figure 2: LJTick-LVDigitalIO With U3

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 Hardware Block Diagram

Figure 3: LJTick-LVDigitalIO Hardware Block Diagram

LJTick-LVDigitalIO Schematic

Figure 4: LJTick-LVDigitalIO Schematic

Specifications

Parameter

Conditions

Min

Typical

Max

Units

Supply Voltage

 

3.6

 

5.25

V

Supply Current

No Load

 

0.2

 

mA

Operating Temperature

 

-40

 

80

°C

Output Drive Current

 

 

100

 

mA

 

 

 

 

 

 

1.8V Logic Voltage

 

 

 

 

 

Vout Output Voltage

 

 

1.8

 

V

Vout Current

 

 

300

 

mA

Rise time

 

 

180

 

ns

Fall time

 

 

580

 

ns

Max Recommended Frequency

No load, 50% duty cycle

 

1

 

MHz

Logic High

 

 

1.78

 

V

 

 

 

 

 

 

2.5V Logic Voltage

 

 

 

 

 

Vout Output Voltage

 

 

2.5

 

V

Vout Current

 

 

300

 

mA

Rise time

 

 

560

 

na

Fall time

 

 

640

 

na

Max Recommended Frequency

No load, 50% duty cycle

 

1

 

MHz

Logic High

 

 

2.46

 

V

 

 

 

 

 

 

3.3V Logic Voltage

 

 

 

 

 

Vout Output Voltage

 

 

3.3

 

V

Vout Current

 

 

300

 

mA

Rise time

 

 

2

 

ns

Fall time

 

 

800

 

ns

Max Recommended Frequency (1)

No load, 50% duty cycle

 

1

 

MHz

Logic High

 

 

3.26

 

V

Logic High (Vmax) at max frequency

1MHz, no load, 50% duty cycle

 

3.1

 

V

(1) Frequencies higher than 350kHz will not produce the full logic high voltage.

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

Files

ON-Semiconductor-NTR4003N-Datasheet.PDF

Diodes-Incorporated-AP2127-Datasheet.pdf

Richtek-RT9193-Datasheet.pdf

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