DK-EVAL-04A
Hardware
Power supply
DK-EVAL-04A is supplied from the internal accumulator or from external power source via micro USB connector XC3 which
also serves as a charger. The TR transceiver is supplied when jumper JP1 is set. Charging is indicated by LED3. The
accumulator is protected against over-current (by resettable fuse SN035-16) and against over-discharging.
The accumulator should be kept charged.
For external power source also connector XC1 (pins 6 and 7) can be used.
Jumper JP1 must be disconnected in this case.
Pushbuttons
•
User pushbutton SW1
is connected to pin C5 of the TR module, active low. Therefore, the TR module should have the C5 pin configured as an
input with internal pull-up. It is arranged by OS by default. Wake-up on change or interrupt on change on this pin can
also be configured by user software.
•
Reset pushbutton SW2
TR module is disconnected from the power supply when the SW2 pushbutton is pressed.
LEDs
•
LED1 and LED2 are on when the appropriate pushbutton is pressed.
•
LED3: charging indication. LED3 is on during charging and switched off when fully charged.
SIM connector
Caution:
The TR module can be plugged / unplugged into / from the SIM connector while powered off only.
Tip:
Use the SW2 pushbutton for this. The TR module is disconnected from power while the SW2 pushbutton is held.
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