EV-ADuCRF101 Evaluation Board User Guide
Rev. 0 | Page 4 of 12
MINI BOARD FEATURES
POWER SUPPLY
Two options are available for powering the board.
• Use the emulator board.
The 5 V USB supply on J3.7 is regulated via the linear
voltage regulator, U2. The 3.3 V regulator output powers
the red power LED, D2. When LK1 is in place, the regulator
output is connected back to the emulator board on J3.8.
The regulator powers the ADuCRF101 only when LK1 and
LK2 are in place on the mini board.
• Apply an external power supply to IOVDD on J1.3.
To measure the ADuCRF101 current consumption only,
apply the supply directly to IOVDD. Remove LK1 and LK2,
and disconnect the emulator board.
It is also possible to power the device from an external
supply at 3.3 V while debugging with the emulator board.
Remove LK1 and insert LK2.
Each device supply pin of the ADuCRF101 is decoupled with
0.1 µF and 100 pF capacitors. A 68 µF capacitor is used on the
supply line for the transceiver.
POWER INDICATOR/GENERAL-PURPOSE LEDS
A power LED (D2) is used to indicate that the interface board
is providing the supply to the board. Note that LK1 and LK2
must be inserted for the ADuCRF101 to be powered from the
emulator board. A general-purpose LED (D1) is connected to
P4.2 of the ADuCRF101. When P4.2 is cleared, the LED is
turned on. When P4.2 is set, the LED is turned off.
CRYSTAL CIRCUITS
Footprints for a through-hole 32.768 kHz watch crystal (Y2)
and its two capacitors are included on the board. This crystal can
be selected by software as the clock source of the wake-up timer.
EMULATOR INTERFACE
Nonintrusive emulation and download are possible on the
ADuCRF101 via serial wire by connecting the emulator board
to the J3 connector. Only two signals are required for debug
purposes: SWDIO and SWCLK. The reset signal is also connected
and can be used to provide a reset from the PC, if required.
Other emulators supporting serial wire debug (for example, JLINK
Version 6 and higher) can be used. The connections between
the mini board and the 20-pin JTAG connector are listed in
Table 3.
Table 3. Mini Board/Emulator Connections
Signal
J3 Connector
(Mini Board)
20-Pin JTAG Connector (Emulator)
GND J3.2 Pin 4, Pin 6, Pin 8, Pin 10, Pin 12,
Pin 14, Pin 16, Pin 18, Pin 20
VDD J3.8 Pin 1 and Pin 2
SWDIO J3.3 Pin 7
SWCLK J3.5 Pin 9
RESET J3.1 Pin 15
Note that the internal pull-ups on SWDIO and SWCLK are
sufficient, and no external resistors are required.
RESET/DOWNLOAD PUSH BUTTONS
A reset push button is available to allow the user to reset the part
manually. When pressed, the reset pin of the ADuCRF101 is pulled
to ground. Because the
RESET
pin on the ADuCRF101 is Schmidt-
triggered internally, there is no need to use an external Schmidt
trigger on this pin. A second push button, BOOT, is connected to
P0.6/IRQ2 and facilitates serial download mode entry.
RS-232 INTERFACE
To interface the ADuCRF101 UART pins to a PC, the USB UART
interface on the emulator board is the first option to consider.
The ADuCRF101 P1.0 and P1.1 lines are available on the top
row of the J3 connector and can be directly connected to EVA L-
ADUC-CABLE1Z, as shown in Fi
gure 4, or similar adaptor that
inclu
des an RS-232 interface device providing the required level
shifting or a USB UART interface. Supply should be provided
on J1.3 (IOVDD) and LK2 inserted when using an RS-232
interface.
To communicate via UART using a UART cable, EVA L -ADUC-
CABLE1Z, the supply should be between 3 V and 3.6 V because
the ca
ble is operational only in this supply range. The EVA L -
ADUC-CABLE1Z is available for purchase on the Ana
log
Devi
ces, Inc. web site.
Figure 4. Mini Board Connected to EVAL-ADUC-CABLE1Z
