Installation and Startup
Rev. 2 January 2021
29
41112510
Low Side Current Sink Output
You can use Pin 4 as a low side current sink; for example, to drive a relay.
Figure 2-17: Low Side Current Sink
Note: The router protection circuitry has a high-impedance (~200 k
Ω
) path to ground. If Pin 4 is
connected to 12 V, there will be a small current flow (~100
μ
A) into Pin 4 during bootup. This flow is
countered when the internal pull-up resistor (10 k
Ω
) becomes active after bootup. Depending on
your application, you may need to install an external pull-up resistor (10 k
Ω
) in order to nullify the
small input current flow for the first 30 seconds during bootup.
LX40
V
in
V
in
Internal pull-up
resistor
Off
Protection
Circuitry
Pin 4 (power connector)
External solenoid/relay circuit
I
Sink
= 500 mA (Typ)*
on page 29 for more details.
Table 2-7: Low Side Current Sink
Pull-up
State
Minimum
Typical
Maximum
Comments
Off
On
300 mA
500 mA
850 mA
I_Typical = 25°C
I_Min = 65°C
I_Max = -30°C
Off
Off
—
0 mA
—
V
in
= 12