SIERRA WIRELESS AirLink LX40 Enterprise LTE Router User Guide

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Installation and Startup  

Low Side Current Sink Output  

You can use Pin 4 as a low side current sink; for example, to drive a relay.  

LX40  

Vin  

Vin  

Internal pull-up  

resistor  

Off  

Protection  

Circuitry  

External solenoid/relay circuit  

ISink = 500 mA (Typ)*  

Pin 4 (power connector)  

* See Table 2-7 on page 29 for more details.  

Figure 2-17: Low Side Current Sink  

Table 2-7: Low Side Current Sink  

Pull-up  

Off  

State  

On  

Minimum Typical Maximum  

Comments  

300 mA  

—

500 mA  

0 mA  

850 mA  

I_Typical = 25°C  

I_Min = 65°C  

I_Max = -30°C  

Off  

Off  

—

V

= 12  

in  

Note: The router protection circuitry has a high-impedance (~200 kΩ) path to ground. If Pin 4 is  

connected to 12 V, there will be a small current flow (~100 μA) into Pin 4 during bootup. This flow is  

countered when the internal pull-up resistor (10 kΩ) becomes active after bootup. Depending on  

your application, you may need to install an external pull-up resistor (10 kΩ) in order to nullify the  

small input current flow for the first 30 seconds during bootup.  

Rev. 4 January 2022  

29  

41112510  

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General	Details
Name	SIERRA WIRELESS AirLink LX40 Enterprise LTE Router User Guide
Make	SIERRA WIRELESS
Language	English
Filetype	PDF (Download)
File size	0.96 MB

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