EMTRON EIC USER MANUAL
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© EMTRON AUSTRALIA PTY LTD APRIL 2018
9
3.4 Pullup Resistors
EIC10
The EIC10 has no switchable pullups to 5V, so an external 1k resistor will need to be fitted
when connecting to a temperature sensor. The 5V Analog Sensor Supply pin can be used as
the pullup supply.
Table 3.1 shows the inputs with software controlled 8V 1k Ohm pullup resistors plus
blocking diode.
Pin
Function
Pull-Up
Pin 9
Analog Voltage 7 or Frequency Input 1
Yes
–
8.0V
Pin 10
Analog Voltage 8 or Frequency Input 2
Yes
–
8.0V
Pin 11
Analog Voltage 9 or Frequency Input 3
Yes
–
8.0V
Pin 12
Analog Voltage 10 or Frequency Input 4
Yes
–
8.0V
Table 3.1. EIC10 Inputs pullup resistor summary
EIC16M
Analog Voltage Channels 9 -12 have independent software controlled 5V 1k ohm pullup
resistors. These are suitable for temperature measurement or as ON/OFF inputs by pulling
the input to ground through a switch.
Analog Voltage Channels 13 -16/ Frequency Inputs 1-4 have software controlled 8V 1k Ohm
pullup resistors plus blocking diode. A summary is shown in Table 3.2.
Pin
Function
Voltage Range
Pull-Up
13
Analog Voltage 9
0.0
–
5.0V
Yes
–
5.0V
14
Analog Voltage 10
0.0
–
5.0V
Yes
–
5.0V
15
Analog Voltage 11
0.0
–
5.0V
Yes
–
5.0V
16
Analog Voltage 12
0.0
–
5.0V
Yes
–
5.0V
17
Analog Voltage 13/Frequency 1
0.0
–
16.5V
Yes
–
8.0V
18
Analog Voltage 14/Frequency 2
0.0
–
16.5V
Yes
–
8.0V
19
Analog Voltage 15/Frequency 3
0.0
–
16.5V
Yes
–
8.0V
20
Analog Voltage 16/Frequency 4
0.0
–
16.5V
Yes
–
8.0V
Table 3.2. EIC16M Inputs pullup resistor summary
NOTE:
The blocking diode on the 8V pullup prevents large frequency based signals back-
feeding into the supply. If these channels are to be used for temperature measurement this
pullup is not suitable. An external 1k resistor will need to be fitted and pulled up to the 5V
Sensor Supply.
