Power output specifications

System power out limits (when powered with 12 VDC)

Temperature (°C) Current limit1 (A)
–40° 4.53
20° 3.00
70° 1.83
85° 1.56

1 Limited by self-resetting thermal fuse

12 V and SW12 V power output terminals

12V, SW12-1, and SW12-2: Provide unregulated 12 VDC power with voltage equal to the Power Input supply voltage. These are disabled when operating on USB power only. The 12V terminal is limited to the current shown in the previous table.

SW12 current limits
Temperature (°C) Current limit 1 (mA)
–40° 1310
0° 1004
20° 900
50° 690
70° 550
80° 470

1 Thermal fuse hold current. Overload causes voltage drop.
Disconnect and let cool to reset. Operate at limit if the application
can tolerate some fluctuation.

5 V fixed output

5V: One regulated 5 V output. Supply is shared between the 5V terminal and CS I/O DB9 5 V output.

  • Voltage Output: Regulated 5 V output (±5%)
  • Current Limit: 230 mA

C as power output

Operating at the current limit is OK if voltage fluctuation can be tolerated. Drive capacity is determined by the logic level of the VDC supply and the output resistance (Ro) of the C terminal. It is expressed as: Vo = 5 V – (Ro • Io), where Vo is the drive limit, and Io is the current required by the external device. For example: at the maximum current limit of 10 mA on C1 the voltage level would reduce from 5 V to 3.5 V.

  • C Terminals:

    • Output Resistance (Ro): 150 Ω
    • 5 V Logic Level Drive Capacity: 10 mA @ 3.5 VDC; Vo = 5 V - (150 Ω •Io)
    • 3.3 V Logic Level Drive Capacity: 10 mA @ 1.8 VDC; Vo = 3.3 V - (150 Ω •Io)

CS I/O pin 1

5 V Logic Level Max Current: 200 mA