User's Manual

On-Ramp Wireless, Inc. iii 014-0033-00 Rev. H
Contents
1 Overview ................................................................................................................ 1
1.1 On-Ramp Total Reach Wireless Network .................................................................................. 1
1.2 microNode .................................................................................................................................. 2
1.3 Referenced Documents ............................................................................................................. 3
2 DC and AC Characteristics .................................................................................. 4
2.1 Absolute Maximum Ratings ....................................................................................................... 4
2.2 Recommended Operating Conditions ........................................................................................ 4
2.3 Effects of Temperature and Voltage .......................................................................................... 6
3 Electrical Interface .............................................................................................. 10
3.1 Signal Descriptions .................................................................................................................. 12
3.1.1 VBATT ............................................................................................................................ 12
3.1.2 POWER_ON ................................................................................................................... 12
3.1.3 RESET_N ....................................................................................................................... 12
3.1.4 MRQ ............................................................................................................................... 13
3.1.5 SRDY .............................................................................................................................. 13
3.1.6 SRQ ................................................................................................................................ 13
3.1.7 USTATUS ....................................................................................................................... 13
3.1.8 SPI System ..................................................................................................................... 13
3.1.9 ANT_SEL ........................................................................................................................ 13
3.1.10 UART_SIN .................................................................................................................... 13
3.1.11 UART_SOUT ................................................................................................................ 13
3.1.12 TOUT ............................................................................................................................ 14
3.1.13 RF_PAEN_EXT ............................................................................................................ 14
3.1.14 RF_TXENA ................................................................................................................... 14
3.1.15 RF_SHDN ..................................................................................................................... 14
3.1.16 RF ................................................................................................................................. 14
3.2 Environmental .......................................................................................................................... 14
3.2.1 ESD ................................................................................................................................ 14
3.2.2 Harsh Environments ....................................................................................................... 15
4 SPI Interface and Sequences ............................................................................. 16
4.1 SPI System Interface Overview ............................................................................................... 16
4.2 SPI Mode and Timing............................................................................................................... 17
4.3 Host Initialization ...................................................................................................................... 17
4.4 Startup (Power On) Sequence ................................................................................................. 17
4.5 Wake Sequence ....................................................................................................................... 19