User ManualTable of Contents1 Overview11.1 picoNode12 DC and AC Characteristics22.1 Absolute Maximum Ratings22.2 Recommended Operating Conditions23 Electrical Interface53.1 Signal Descriptions74 Applications114.1 Powered Operating Mode114.2 Battery Operated Mode115 SPI Interface and Sequences145.1 SPI System Interface Overview145.2 SPI Mode and Timing155.3 Host Initialization155.4 Startup (Power On) Sequence155.5 Wake Sequence175.6 Host-Driven Reset Sequence195.7 Host MRQ Release/picoNode Allowed to Sleep Sequence206 Power States216.1 Operating States217 SPI Messaging Protocol237.1 Arbitration237.2 Message Protocol237.3 Host Interface SPI Bus State Machine267.4 SPI Bus Timing Example277.5 Host Message SPI Example287.6 Host Message “Connect” SPI Example308 picoNode Provisioning339 Antenna Diversity349.1 Antenna Design Considerations349.2 Diversity Considerations359.3 Block Diagram369.4 Antennas3610 Regulatory Considerations3910.1 FCC Warnings3911 Errata41Figure 1 Typical Application Diagram1Figure 2 SPI Timing, CPOL = 0, CPHA = 015Figure 3 picoNode Power-up Timing Sequence16Figure 4 Host-Initiated picoNode Wake Sequence – SRDY Low (Synchronous)17Figure 5 Host-Initiated picoNode Wake Sequence – SRDY High (Asynchronous)18Figure 6 Host-Driven Reset Sequence19Figure 7 Host MRQ Release/picoNode Allowed to Sleep Sequence20Figure 8 SPI Master and Slave Message Sequences25Figure 9 Host Interface SPI Bus State Machine26Figure 10 SPI Timing Example27Figure 11 Host Message on SPI – MMsg Pair28Figure 12 Host Message on SPI – MHdr Pair29Figure 13. Antenna Diversity with Ethertronics34Figure 14 picoNode Block Diagram36Figure 15 Controlled Impedance RF Trace Design38Figure 16 picoNode PCB Land Pattern45Figure 17 picoNode PCB Land Pattern Keepouts45Figure 18. Powered Example46Figure 19 Lithium Battery Example46Figure 20 picoNode Mechanical Dimensions47Table 1. picoNode Specifications1Table 2. Absolute Maximum Ratings2Table 3. Operating Conditions2Table 4. Operating Characteristics2Table 5. picoNode Pin Descriptions5Size: 1.18 MBPages: 52Language: EnglishOpen manual