RTCU NX-200 Technical Manual V1.00
Advanced Automotive M2MI/IoT Gateway
Logic IO ApS.
Ph: (+45) 7625 0210
Holmboes Allé 14
Fax: (+45) 7625 0211
8700 Horsens
Page 15 of 45
Email: [email protected]
Denmark
Power supply
The RTCU NX-200 device must be supplied with 8..36 VDC from an external DC power source
connected to the 4 pin power connector. Positive power is applied to the SUPP pin, and the ground
is connected to the PGND pin.
The connector has two “SUPP” supply pins as these also supplies power to the digital outputs. If
the total current consumption on the digital outputs exceeds 1.5A, then power must be applied to
both pins. Otherwise, one pin is sufficient.
There are three different labels for the ground connections: Power Ground (PGND), Signal Ground
(SGND) and Analog Ground (AGND). The signal and analog grounds are filtered from the power
ground. Power ground must only be used as a power supply return path. The signal ground is
used as a ground reference for digi
tal I/O’s and serial interfaces, a
nd the analog ground is used as
a low noise analog ground reference for the analog inputs.
The RTCU NX-200 is protected against wrong polarity. If a chassis or system grounds are
connected to either SGND or AGND, a wrong polarity on the supply lines will destroy the internal
GND connection. For the avoidance of such a scenario, a fuse can be installed on the positive
supply.
The RTCU also contains an internal high capacity backup battery that will supply the RTCU, if the
external power supply should fail or be disconnected. By default, the RTCU is powered down
when a power failure occurs. This setting, however, can be changed. Please consult the RTCU IDE
documentation for additional information.
Disabling the external DC power from the application interface and forcing the device to operate
on the internal backup battery is supported. Please consult the RTCU IDE documentation for
additional information.
When the ignition input is activated with a logical high, the RTCU device will wake-up if it was in
power-down mode. The ignition input (digital input 1) is available on the power connector to
minimize the need for connectors in minimal installations, but it is also available on the X3
connector (digital I/O and analog Inputs) - only one should be used at a time.
X1: 4 pin PWR connector overview.
Pin
Name
Description
1
SUPP
Power supply, positive (+) connection
2
DI1/IGN
Digital input 1 / Ignition input (Shared with 16 pin connector)
3
SUPP
Power supply, positive (+) connection
4
PGND
Power Ground
