Optii Technical Specification

Electrical Connection

The I2C Galvanic Isolation/Level Shifter Optii has two Mini-DIN connectors for the connection of the two I2C buses. The figure shows the pin assignment of the male connector

PIN Description
4 Vcc

Mechanical Specification

Mechanical Data (these values may differ)

  • Height: 28 mm
  • Width: 42 mm
  • Length: 68 mm
  • Material: blue plastic housing
  • Weight: 50 g

Absolute Maximum Ratings

Supply Voltage (Vcc) -0.5 V to 6.0 V
Input Voltage I2C-lines Vcc
Testpin Input Vcc
Temperature Range 0 °C to +40 °C
Sink Current (on Line) 200 mA
Isolation Voltage 2500 V

Warning: Stresses beyond those listed may cause permanent damage to the device!

Power Supply Characteristics

Min Typ Max Unit
Supply Voltage 1.5 5.5 V
Power Mode Switch Voltage 2.5 V
Power Mode Switching Hysteresis 600 mV
Power Dissipation (one Bus) 40 100 mW

I2C-Line Characteristics

Min Typ Max Unit
Max. Transfer Speed 0 800 kHz*
Propagation Delay 50 ns**
Capacity 50 pF
Sink Current 200 mA

*) Accelerated Fast Mode (Fast Mode ist specified with 400 kbit/s only). This means that boosting, as specified for High-Speed Modes above 400 kbit/s, is not supported.

**) This is the delay between the detection of an active external device and the activation of the appropriate transducer on the other bus. The overall propagation delay depends on the bus capacity and the pull-up resistors.

Testpin Characteristics

Min Typ Max Unit
Logic High Input Threshold 0.85 V
Logic Low Input Threshold 0.4 V
Logic High Output Voltage Vcc V
Logic Low Output Voltage 100 mV
Propagation Delay 200 ns

Reference Voltage

Figure 2 shows Optii’s internal reference voltage for both power modes.

Figure 2 Internal Reference Voltage Uref

Remaining Voltage

Figure 3 shows the remaining voltage if Optii pulls down an I2C line in dependency of the pull-up resistor Rp.

Figure 3 Remaining Voltage Ulow

Supply Current

The necessary supply current for proper operation in dependency of the supply voltage is shown in Figure 4. This is the current for a single bus only.

Figure 4 Supply Current (Single Bus)

Power Consumption

The typical power dissipation of a single bus is shown in Figure 5.

Figure 5 Power Dissipation (Single Bus)