User's Manual
Table Of Contents
- About This Book
- Chapter 1 Safety1322x Sensor Node Information
- Chapter 2 1322x Sensor Node Module Overview and Description
- Chapter 3 System Overview and Functional Block Descriptions
- Chapter 4 Interface Locations and Pinouts
- 4.1 Overview
- 4.2 Power Management
- 4.3 RF Circuitry
- 4.4 USB Connector (“B” Receptacle)
- 4.5 LEDs, Switch, Buttons and Joystick
- 4.6 Debug/Development Connector (ARM JTAG Interface)
- 4.7 Audio Subsystem Connections
- 4.8 GPIO Connector
- 4.9 FLASH Memory Recovery Jumpers and Erase
- 4.10 ADC Voltage References
- 4.11 Jumper Selection
- Chapter 5 Schematic, Board Layout, and Bill of Material
System Overview and Functional Block Descriptions
1322x Sensor Node Reference Manual, Rev. 1.1
Freescale Semiconductor 3-3
The RF radio interface provides for low cost and high density as shown in Figure 3-3. An onboard balun
along with a TX/RX switch allows direct connection to a single-ended 50-Ω antenna. The integrated PA
provides programmable output power typically from -30 dBm to +4 dBm, and the RX LNA provides -95
dBm sensitivity. This solution also has onboard bypass capacitors and crystal load capacitors for the
smallest footprint in the industry. All components are integrated into the package except the crystal and
antenna.
Figure 3-3. MC1322x RF Interface
Augmenting the core device on the Sensor Node are:
• Low-cost 2.4 GHz ISM Band radio
• 2.0 USB connection
• User interface with pushbuttons, and LEDs
• Versatile power sources and management
• Debug / development port
• Audio subsystem
• Pressure, temperature, and accelerometer sensors
• GPIO connector for system expansion
Users are encouraged to reference the board schematic for the topics covered in the following sections.
3.3 Power Management and Measurement
To allow maximum versatility, the Sensor Node can be powered via a DC source (typically an AC-DC
converter; nominally 5 Vdc), the USB node, or an onboard battery pack with 2 AA alkaline batteries.
• The DC source or USB will automatically shutdown the battery supply.
• The DC source and the USB power are regulated to 3.3 V, however, the raw battery pack voltage
directly supplies the circuitry
• All sources are isolated via diodes.
• An on/off switch and a power-on LED are provided (see Section 4.2.2, “On/Off Switch and Power
On Indicator”).
ANALOG
TRANSMITTER
ANALOG
RECEIVER
RF
TX/RX
SWITCH
BALUN
LNA
PA