SVN-840C Development Board
Getting Started Guide
Eagle Matrix Co., Ltd. Copyright @2019
All of the normal voltage VDD power sources can be disconnected or isolated from the common
VDD by cutting or unsoldering the solder bridges SB3, SB17 (Near Coin Cell), SB18 (Between 10 pin
Cortex Connector and Tag connectors), SB19 (Near JTAG 20 pin Connector). The VBUS or 5V power
plane can be disconnected from the power switch SW1 by cutting solder bridge SB20.
Low Frequency Crystal
By default, the low frequency crystal is connected to the SVN-840C module as shown in Figure 1.
The allows for the most clock modes to be used. The crystal can be disconnected, and the pins can
be used as GPIO pins. The crystal is connected to the module by shorted solder bridges SB1 and
SB2. The GPIO are connected by open solder bridges SB8 and SB9. To use the GPIO please cut SB1
and SB2 and connect SB8 and SB9.
NFC Antenna Connector
By default, the NFC connector is not connected to the SVN-840C and is instead connected to GPIO.
If you wish to use the NFC connector, please move the 0R resistors R7 and R8 to series pads C12
and C13.
Note: Because the NFC is not connected by default any Nordic SDK examples that use NFC will
need to have the 0R resistors moved for the to be NFC connected.
LEDs
4 LEDs are provided on the SVN-840C Development Board. These green LEDs are connected to the
pins of the SVN-840C module similarly as the Nordic nRF52 DK, sharing the same pins. They are
connected to the VDD plane and are active low, the GPIO needs to be enabled for high drive when
you wish to use these. They can be disconnected from the module by cutting solder bridges SB4,
SB5, SB6, and SB7.
Note: All LEDS require a minimum of 2V in the VDD to turn on, if you are operating under 2V it is
not possible to use the LEDS on the development board including the power indicator LED.
Push Buttons
There are 4 push buttons connected to the SVN-840C Development Board. They are connected to
the pins of the SVN-840C module similarly as the Nordic nRF52 DK, sharing the same pins. The
push buttons are all active low and connect to ground when pressed. The button pins need to be
set with the internal pull-up resistors to work properly.
High and Normal Voltage Current Measure
The current of the SVN-840C development board can be measured in high voltage mode using the
connector P10 near power switch SW1. To measure the current solder bridge SB14 must be cut
and an Ammeter can be placed in series using P10.
