Advanced Printing Systems
SS205-V4+ LV - Technical Manual - Rev B Page 19
This is given for a Phototransistor working in linear mode. Icc threshold can be approximated as a linear
function of I Led (for 5 mA < I Led < 35 mA).
Note: This might be affected by ambient light perturbations. In order to prevent this, it is recommended to
perform differential measurement of Icc (or Vout):
- First, Icc1 (or Vout1) with opto Led switched off
- Then Icc2 (or Vout2) with opto Led switched on
and calculate Icc = Icc2 – Icc1 (or Vout = Vout2 – Vout1)
In order to optimize and decrease the number of elements of the SS205-V4-LV-CA, the opto sensor can
perform dual functions - door open and end of paper detection. The shape and distance from the opto
sensor to the paper is designed in a way that as soon as the door is opened, the distance between the paper
and the sensor increases.
Phototransistor Threshold current given in sample of §6.1 can be adjusted to handle this state as an
absence of paper.
It is highly recommended to integrate differential measurement (Led switch off/on) and adjust calibration
for better reliability.
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