
Manufacturer Specific Profile Area
Manual • Doc.-No.: C.3034.21 / Rev. 1.2
CAN-CBX-THERMO
Page 102 of 123
8.11.2 ADC_PGA (2400
h
)
Index
Sub-
index
Description
Value range
Default
Data type
Access
2400
h
0
Number_of_entries
4
4
unsigned 8
ro
1
ADC_PGA_1
1...4
3
unsigned 8
rw
2
ADC_PGA_2
1...4
3
unsigned 8
rw
3
ADC_PGA_3
1...4
3
unsigned 8
rw
4
ADC_PGA_4
1...4
3
unsigned 8
rw
Description of the parameter ADC_PGA_x (x = 1...4):
This parameter sets the gain (PGA) of the A/D-converters (ADS1255).
Value range:
The gain V
x
is:
V
x
= 2
ADC_PGA_x
The gain 2, 4, 8 and 16 can be set. The gain is transparent for the user and already included in the
calculation of the firmware.
NOTICE
For the connection of thermocouples the following voltage limits have to be considered.
Depending on ADC_PGA_x the maximum permissible voltage values are:
Gain
(ADC_PGA_x)
Input voltage
U
FS
[V]
1
± 1.024
2
± 1.024
3
± 0.512
4
± 0.256
INFORMATION
The recommended gain is ADC_PGA_x =3.