UM0574

Hardware setup

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The EF indicates the condition of the driven LEDs. If any of them is found to be defective,

error detection mode is activated and the EF LED turns on.

The TF indicates the thermal condition of the LED driver. If the temperature exceeds the

maximal allowed temperature, the driver automatically switches off its outputs. The TF LED

shines over the whole period while the driver outputs are switched off due to the over

temperature.

2.5

Jumpers for LED failure simulation

Some LED defects can be simulated. The removal of jumper P20, P21 and P22 causes

open circuits of the D1-green, D2-green and D3-green LEDs, respectively. The attachment

of the jumper to position P1, P2 and P3 causes a short-circuit of the D6-blue, D9-blue and

D12-blue LEDs.

These simulated defects can be detected during activation of the error detection mode (see

Chapter 3, which describes the firmware modes). The defective LED is indicated by

switching of the corresponding red LED.