M2M Control CX660 Technical Manual V1.02
Advanced Automotive M2MI/IoT Gateway
Page 15 of 44
Power supply
The M2M CONTROL CX660 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 digital I/O’s and serial interfaces, and the analog ground is used as
a low noise analog ground reference for the analog inputs.
The M2M CONTROL CX660 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 CX660 also contains an internal high capacity backup battery that will supply the device, if the
external power supply should fail or be disconnected. By default, the CX660 is powered down
when a power failure occurs. This setting, however, can be changed. Please consult the M2M
CONTROL 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 M2M CONTROL IDE
documentation for additional information.
When the ignition input is activated with a logical high, the 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
DIN5/IGN
Digital input 5 / Ignition input (Shared with 16 pin connector)
3
SUPP
Power supply, positive (+) connection
4
PGND
Power Ground
