onsemi RSL15, User Manual

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EVBUM2757/D
www.onsemi.com
2
BOARD DESIGN & OVERVIEW
Introduction
The RSL15 Evaluation and Development Board is
designed for simplicity of use when evaluating capabilities
and developing applications for the RSL15 Bluetooth Low
Energy Wireless MCU. For more information about the
RSL15 System on Chip, please visit
www.onsemi.com/
rsl15 . For information on how to get the board connected
and programmed quickly, see the RSL15 Getting Started
Guide.
The EVB provides configuration options available and
features that are intended to provide an easy − to − use
development experience. Some of these features include an
automatic switching power supply between USB and battery
power, and a DIP switch for quickly disconnecting the
J
− Link OB MCU from the RSL15, usually for accurate
power measurements.
The RSL15 EVB includes SEGGER J − Link on − board
technology that supports easy development and debugging
through a single USB cable. The RSL15 Evaluation and
Development Board main functional blocks are presented in
Figure 1.
RSL15 Evaluation and Development Board Features
The RSL15 Evaluation and Development Board enables
developers to evaluate the performance and capabilities of
RSL15, and to develop, demonstrate, and debug
applications. Key features of the EVB include:
•
Easy code download and debugging with SEGGER
J
− Link on − board technology
•
JTAG debug port accessible via 10 − pin header
•
Automatic power supply switching between battery and
USB
•
Access to all RSL15 interfaces and GPIOs via standard
0.1 inch headers
•
2 push button switches
♦
1 dedicated to resetting the device via the NRESET
pin
♦
1 connected to GPIO0
•
Test points and GND hooks for easy probing
•
CR2032 Battery Holder
•
Simple configuration for power measurements
•
Integrated PCB antenna with matching and filtering
network
•
UFL connector used for conducted RF connections
CONFIGURATION
Power Supply
The RSL15 Evaluation and Development Board is
equipped with an easy − to − use power supply. The Board can
be powered from three sources:
•
A CR2032 standard 3.0 V battery inserted into the battery
holder
•
Power from the USB connection, 5 V, regulated down to
3.0 V by an on
− board regulator
•
An external power source connected to headers on board
In the default configuration out of the box, the board
sources VBAT from VOUT, and VDDO is shorted to VBAT.
VOUT is the output of the automatic switching power
supply, sourced from the CR2032 battery or USB
connection.
The on − board LEDs are guaranteed to work at the default
3.0 V level for VDDO. Below the 3.0 V level, the BLUE
LED might not illuminate. The green LED illuminates at
a voltage level of 1.7 V or above.
The NRESET pad of the device has an internal pull − up
resistor to VDDO. If VDDO is left unpowered, the NRESET
pad will be left floating, possibly resulting in unintended
resets. For this reason, it is recommended to always have
VDDO powered.
WARNING:
The absolute maximum safe voltage for this
product is 3.6 V. Any overvoltage conditions
are likely to damage the device. 4.3 V Li
− Ion
CR2032 batteries cannot be used directly in
the battery holder.
Configuration of the power supply is achieved with the
following configuration headers shown in Table 1:
Table 1. POWER SUPPLY CONFIGURATION HEADERS
Designator Function
VBAT-SEL
− Main configuration header, selects the
source for
VBAT
− Short pins 3 & 2 (labeled VOUT and
VBAT) for sourcing power from the battery
or USB connection. DEFAULT POSITION
− Remove the jumper and connect an
external power source to pin 2 (labeled
VBAT) and a GND connection to power
the board from an external power source.
− Short pins 1 & 2 (labeled VBAT and 3V0)
to bypass the load switch devices and
power the RSL15 from the on − board
regulator directly.
VDDO-EN
Short this header to connect VBAT and
VDDO together. Pin 1, labelled VDDO,
can be used to connect an external power
source.
This header is shorted by
DEFAULT .