EVBUM2757/D
5
Figure 3. J
−
Link Connection
J
−
Link
Debugger
Host PC
RSL15
Evaluation and
Development
Board
JTAG
Header
10
−
pin Ribbon
Cable
General Purpose Input/Output (GPIO)
The RSL15 Evaluation and Development Board contains
15 GPIO signals available on several inline headers. The
headers provide access to all GPIO signals, which in turn
provide access to a wide variety of interfaces (GPIO, SPI,
UART, etc.). See Table 3 for pinouts. VDDO, VBAT and
GND are present on the end of each header.
Table 3. GPIO REFERENCE
GPIOs
GPIO
Header Pin
Header
Alternate Function
On Board
0
5
GPIO-A
Wakeup source, SW1
1
7
GPIO-A
Wakeup source, RTC
clock input
2
9
GPIO-A
JTAG TDO*, Wakeup
source
3
11
GPIO-A
JTAG TDI*, Wakeup
source,
4
12
GPIO-A
JTAG TRST*,
5
10
GPIO-A
UART RXD (from
RSL15)
6
8
GPIO-A
UART TXD (from
RSL15)
7
6
GPIO-A
8
5
GPIO-B
GREEN LED
9
7
GPIO-B
10
9
GPIO-B
BLUE LED
11
11
GPIO-B
12
12
GPIO-B
13
10
GPIO-B
14
8
GPIO-B
15
6
GPIO-B
*Assigning a function to these GPIOs other than JTAG pins means
they cannot be used for the JTAG connection.
The RSL15 Evaluation and Development Board also has
one momentary switch that can be used as a momentary hard
pull
−
down on
GPIO0
(
SW1
). The
RESET
switch can be
used to reset the RSL15.
For more information on the GPIOs, refer to the RSL15
Hardware Reference Manual.
Jumper Wires Female to Female 6.00 in (152.40 mm)
28 AWG can be used to connect GPIOs to external
peripherals or instruments. Such cables can be procured
from SparkFun Electronics PN: PRT
−
12796.
RF
The RSL15 Evaluation and Development Board contains
two features that assist with evaluating the capabilities of the
RSL15 and assist in developing Bluetooth applications.
These two features are the on
−
board antenna and the UFL
connector. The functions are switched between via a 0
W
resistor soldered onto part footprint R4.
Integrated PCB Antenna
The integrated PCB antenna is the default option for
radiating the RF output of the RSL15. If it is desired to use
the on
−
board antenna, no changes need to be made out of the
box.
UFL Connector
Placed on the PCB is a UFL connector that can be used to
connect to the conducted RF output of the RSL15. By
default, the UFL connector is disconnected from the RF
output. In order to connect the UFL connector to the RF
output, R4 must be uninstalled and R5 populated. To switch
back to the integrated antenna, R4 must be populated and R5
uninstalled. Note that R4 and R5 share a pad.
Figure 4. Selection of RF Path Through R4, R5 (0
W
Resistors)
