NXP Semiconductors TWR-RF-SNAP User manual

TWR-RF-SNAP featuing the Synapse Wireless SM700 IEEE 802.15.4 RF Engine
USER’S MANUAL
TWR-RF-SNAP
Document Revision v1.0
© 2011 Synapse, All Rights Reserved
All Synapse products are patented or patent pending
Specifications are subject to change without notice –confirm that data is current
Synapse, the Synapse logo, SNAP, and Portal are all registered trademarks of
Synapse Wireless, Inc.
500 Discovery Drive
Huntsville, Alabama 35806
877-982-7888
Doc # 600049-01A
© Freescale Semiconductor, Inc. 2011. All rights reserved.
Freescale™ and the Freescale logo are trademarks of
Freescale Semiconductor, Inc. All other product or service names
are the property of their respective owners.

TWR-RF-SNAP User’s Manual Page 2 of 22
Contents
1 Overview ......................................................................................................................................................3
2 Reference Documents..............................................................................................................................5
3 Hardware Features...................................................................................................................................6
3.1 Using the TWR-RF-SNAP.................................................................................................................................................6
Options for Powering the TWR-RF-SNAP Module:
Installing into the Tower System:
3.2 IEEE 802.15.4 RF Engine.................................................................................................................................................8
SM700 RF Engine: Synapse Part # SM700PC1
3.3 On-board Sensors, Inputs, and Indicators................................................................................................................9
Temperature Sensor:
Photocell (Light Sensor):
Power Switch:
User LED 1 (Red):
User LED2 (Green):
Power LED:
Switch 2 (software accessible input):
Switch 3 (software accessible input):
Reset Button:
3.4 Expansion Interfaces......................................................................................................................................................10
TWPRI Connector:
UART1 (SNAP UART0):
UART2 (SNAP UART1):
I2C (SNAP I2C):
SPI (SNAP SPI):
ADC:
GPIO Expansion Header:
3.5 SNAP SN132 USB Dongle..............................................................................................................................................12
RF100 RF Engine: Synapse Part # RF100P86
Software Features...................................................................................................................................... 13
3.6 SNAP / SNAPpy.................................................................................................................................................................13
SNAP Highlights:
3.7 Synapse Portal IDE..........................................................................................................................................................14
Portal Highlights
4 Configuration Settings..........................................................................................................................18
4.1 Jumper / Switch Settings..............................................................................................................................................18
5 Electromechanicals ...............................................................................................................................19
5.1 Elevator Connections.....................................................................................................................................................19
5.2 Tower Form-Factor ........................................................................................................................................................22

TWR-RF-SNAP User’s Manual Page 3 of 22
1Overview
The Wireless Mesh Networking Tower Board (TWR-RF-SNAP) is a peripheral Tower System Module.
The TWR-RF-SNAP provides wireless mesh networking via the FCC Certified Synapse Wireless SM700
RF Engine. The SM700 is based on the Freescale MC13224 chip which combines a 32-bit ARM7 MCU
with an IEEE 802.15.4 radio transceiver.
The TWR-RF-SNAP module can function standalone or within the Tower System. As part of the Tower
System, the TWR-RF-SNAP can interface with Tower System controller modules via SPI and can access
available Tower System peripheral modules using UART or I2C. The TWR-RF-SNAP also includes a
General Purpose Tower Plug-in (TWRPI) socket allowing direct access to a selection of sensor plug-ins
via I2C.
A SN132 USB Dongle is also included with the TWR-RF-SNAP. The USB Dongle features the RF100 RF
Engine based on a Freescale MC9S08 MCU and the Freescale MC13191 radio. The USB dongle
provides a communication portal to a host computer via USB.
The TWR-RF-SNAP can be accessed in Synapse’s Portal IDE using either the on-board USB or wirelessly
using the included RF100 USB Dongle.
The TWR-RF-SNAP features the following:
Synapse Wireless SM700. A surface-mount RF Engine powered by the Freescale MC13224.
Onboard Sensors / Push Buttons / LEDs for user interaction and feedback
Tower Plug-in (TWRPI) socket for additional sensors
microUSB connector for powering and providing wired access to the Portal IDE
Optional battery connector for untethered operation.
Included SN132 USB Dongle with RF100 RF Engine for wireless access to a host computer

TWR-RF-SNAP User’s Manual Page 4 of 22
A block diagram for the TWR-RF-SNAP is shown in the figure below.
Primary Tower Elevator Connector
SM700
Synapse Wireless
802.15.4 RF Engine
TWRPI Socket
GPIO Expansion
Header
USB
Interface
Photocell
Sensor
Temp.
Sensor
PushbuttonsReset
LEDs
microUSB
UART
I2C
SPI
I2C, Analog, GPIO
GPIO
UART
Analog
Analog
Isolation Jumper Block
Figure 1 - TWR-RF-SNAP Block Diagram

TWR-RF-SNAP User’s Manual Page 5 of 22
An image of the TWR-RF-SNAP with callouts is shown in the figure below.
Figure 2 - TWR-RF-SNAP Image
2Reference Documents
The documents listed below should be referenced for more information on the Freescale Tower
system and the TWR-RF-SNAP. Refer to http://freescale.com/tower for the latest revision of all
released Tower documentation.
TWR-RF-SNAP Schematics
TWR-RF-SNAP Quick Start Guide
TWR-RF-SNAP Lab Document

TWR-RF-SNAP User’s Manual Page 6 of 22
3Hardware Features
This section provides more details about the features and functionality of the TWR-RF-SNAP.
3.1 Using the TWR-RF-SNAP
Options for Powering the TWR-RF-SNAP Module:
The module can be powered using any of the following options:
1) USB connector (either via USB AC-power supply or USB port on a PC)
2) The Tower Elevator modules (relying on the 5V supply pins)
3) The battery connector
Power Switch Settings:
Power Switch
Position
Operation
Far Left
Draws power from the battery connector
Middle
OFF
Far Right
Draws power from USB Port or Primary
Elevator connector
Installing into the Tower System:
In additional to functioning standalone, the TWR-RF-SNAP is designed to be used in the Freescale
Tower System. When inserted into the Tower System a Tower MCU module can utilize the TWR-RF-
SNAP to relay information to additional SNAP nodes, including the provided SN132 USB Dongle. The
TWR-RF-SNAP can also access compatible peripheral modules directly using I2C and SPI.
To ensure proper functionality of the TWR-RF-SNAP within the Tower System the Primary Edge
connector (marked with the white stripe) must be inserted into the Primary Elevator.
The TWR-RF-SNAP is also compatible with the General Purpose Tower Plug-in modules (or TWRPIs). A
TWRPI module can be inserted directly into the available socket on the TWR-RF-SNAP. The TWRPI
socket on the TWR-RF-SNAP provides access to I2C, Analog, and GPIO’s.

TWR-RF-SNAP User’s Manual Page 7 of 22
Figure 3 - Freescale Tower System Overview

TWR-RF-SNAP User’s Manual Page 8 of 22
3.2 IEEE 802.15.4 RF Engine
The TWR-RF-SNAP features the Synapse Wireless SM700 IEEE 802.15.4 RF Engine. The SM700 RF
Engine is based on the Freescale MC13224V transceiver platform. The SM700 comes with SNAP®
preloaded and ready to perform out of the box. SNAP is Synapse’s award-winning, mesh network
operating system that provides wireless connectivity for Internet-to-machine and machine-to-machine
communications.
SM700 RF Engine: Synapse Part # SM700PC1
Powerful 32-bit TDMI ARM7 microprocessor
Large on-board memory resources
oAllows for over-the-air SNAPpy script and SNAP OS upgrades
Accurate 12-bit ADC for precision sensors
SNAP –Instant-ON mesh network operating system
Powerful, reliable wireless connection in 2.4GHz license-free band
o2.4 GHz RF Frequency (2400 - 2483.5 MHz)
o16 RF Channels
Up to 100mW output power
-96 dBm Rx sensitivity
+20dBm Tx output power
2.0 to 3.6 Volts Vcc
Small footprint: 1” x 1.4” (25.4mm x 36.5mm)
Low power consumption:
oTransmit mode……193mA
oReceive mode………30mA
oHibernate mode……1.1μA
Integrated F-antenna
Over 1.5 miles range
Available AES 128-bit encryption
FCC, CE and IC certified

TWR-RF-SNAP User’s Manual Page 9 of 22
3.3 On-board Sensors, Inputs, and Indicators
The following interfaces are implemented in the TWR-RF-SNAP to allow for user interaction.
Temperature Sensor:
-Connected to ADC Ch. 1 (physical pin 9 of the SM700) –SNAP GPIO 31
-Low-Power Linear Active Thermistor IC
-Analog output
Photocell (Light Sensor):
-Connected to ADC Ch. 0 (physical pin 8 of the SM700) –SNAP GPIO 30
-Analog output
Power Switch:
-Left position –Draws power from the battery connector
-Middle position –OFF
-Right position –Draws power from the tower elevator or USB port
User LED 1 (Red):
-Connected to TMR0 (physical pin 34 of the SM700) –SNAP GPIO 8
-Activated by setting the pin HIGH
User LED2 (Green):
-Connected to TMR1 (physical pin 33 of the SM700) –SNAP GPIO 9
-Activated by setting the pin HIGH
Power LED:
-Green LED (D5) will indicate when power is applied to the board
Switch 2 (software accessible input):
-Connected to Physical Pin 57 of the SM700 –SNAP GPIO 22
-KBI pin –wake from sleep interrupt capable
-Switch is grounded when pressed
Switch 3 (software accessible input):
-Connected to Physical Pin 56 of the SM700 –SNAP GPIO 23
-KBI pin –wake from sleep interrupt capable
-Switch is grounded when pressed
Reset Button:
-Push button tied directly to RESET on the SM700 / Reboots the device

TWR-RF-SNAP User’s Manual Page 10 of 22
3.4 Expansion Interfaces
The following interfaces allow for expandability of the TWR-RF-SNAP.
TWPRI Connector:
-Freescale standard connector for General Purpose Tower Plug-ins (TWRPIs)
-Allows for plug-in of several different sensors –ex.TWRPI-MMA7660 Accelerometer
-Interfaces to sensors via I2C and/or ADC (ADC 5-7)
-See figure below for specific pin-out (J15 is the right connector, while J14 is the left connector)
UART1 (SNAP UART0):
-Connected to Physical Pins 36-37 –SNAP GPIO 14-15
-RX = Pin 37/GPIO_15, TX = 36/GPIO_14
-This serial port attaches to edge-connectors (elevator) for communication with other devices
within the Tower System
UART2 (SNAP UART1):
-USB connected to UART2 of the system (Physical Pins 21, 23-25) - SNAP GPIO 21-18
-RTS = Pin_21/GPIO_21, CTS= 23/GPIO_20, RX = 24/GPIO_19 , TX = 25/GPIO_18
-Used to upload firmware, factory default the SNAP settings, or erase a script (via Portal)
-Connected to the USB port