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DM1800-434MB Scheda tecnica(PDF) 2 Page - RF Monolithics, Inc |
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DM1800-434MB Scheda tecnica(HTML) 2 Page - RF Monolithics, Inc |
2 / 4 page 2 Theory of Operation The major components of the DM1800- 433.92MB include an RFM TR3000 ASH transceiver and a Microchip PIC16F688 microcontroller. The TR3000 operates on a frequency of 433.92 MHz, at a nominal out- put power of 1 mW. The 16F688 provides a 9.6 kb/s serial inter- face for communication with a host micro- controller. A companion interface board is also available with USB bridge circuitry to in- terface the DM1800 to a host PC. Three of the 16F688 I/O pins are configured for exter- nal monitoring or control. Digital In is config- ured as a logic input with a weak pull-up for sensing a contact closure to a DM1800 ground pad. Digital Out is configured a logic output. Analog In is configured as a 10-bit analog-to-digital input. The DM1800 includes two LEDs that indicate the module’s operat- ing mode. The LEDs can be disabled for low current operation. The DM1800-434MB is compatible with RFM’s miniMESHTM network protocol, which provides add-on “plug-and-play” multicast mesh network routing to improve communi- cation range and robustness. TX M O D RX D AT A C N TR L1 C N TR L0 PI C 16F 6 88 µP D M 1800- 434M B B l o ck D i ag r a m LE D 1 LE D 2 AS H T r an scei ver GN D S E RI AL T X S E RI AL R X DI G I T A L O U T ANAL O G I N DI G I T A L I N BI ND GN D VO U T VI N 3 V Re g GN D GN D J1 - 1 J1 - 2 J1 - 3 J1 - 4 J1 - 5 J1 - 6 J1 - 7 J1 - 8 J1 - 9 J1 - 1 0 J2 - 2 J2 - 1 J2 - 3 Figure 1 |
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