TC Electronic DB8 MKII - Manual (Page 35)

35
frame - sysTem -maIn -GpI
operation
GPI Technical specifications
Inside the processor, a 10kohm resistor connects the Tip terminal to a +5V power supply. When nothing is connected to
the GPI input, the input voltage therefore is +5V. Resistors can be used to pull down the voltage as suggested in Fig 1.
In Table 1, voltages outside the limits mentioned are to be considered invalid. No action is taken if invalid measurements
are made. GPI recall action resumes when a stable, valid measurement again is detected.
Mode
1 of 2
1 of 4
1 of 8
Preset No
0
1
0
1
2
3
0
1
2
3
4
5
6
Target / Vs
1.000 (idle)
0.000
1.000 (idle)
0.687
0.545
0.438
1.000 (idle)
0.824
0.687
0.600
0.545
0.489
0.437
0.400
Target typ / V
5.00
0.00
5.00
3.44
2.73
2.19
5.00
4.12
3.44
3.00
2.73
2.44
2.19
2.00
Max typ / V
5.00
0.51
5.00
3.50
2.79
2.25
5.00
4.18
3.50
3.06
2.79
2.50
2.25
2.06
Min typ / V
2.67
0.00
4.16
3.38
2.67
0.00
4.50
4.06
3.38
2.94
2.67
2.38
2.13
0.00
Tech Notes:
“Idle” refers to the state when no input is connected, or when the input is left floating.
Rather than absolute voltage measurements, the windows are defined as a fraction of
the supply voltage, Vs. This voltage can be measured with a high impedance DMM on
the Tip terminal when no pull down resistors are applied.
The table shows values as a fraction of Vs, and, as a guideline, typical voltages when
Vs=5.000V. (If the Supply voltage is e.g. 5.015V, the table should be corrected by
multiplying these values by 5.015/5).