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LTP5902 Datasheet(PDF) 10 Page - Linear Technology |
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LTP5902 Datasheet(HTML) 10 Page - Linear Technology |
10 / 29 page A d v a nce d I n fo rm a t i o n 10 Linear Technology / Dust Networks Eterna Datasheet 4.0 Operation In order to provide capabilities and flexibility in addition to ultra low power, Eterna operates in various states, as shown in Figure 8 and described in this section. CPU and peripherals inactive RESETn low and FLASH_P_ENn low lowPowerSleep Command Operation Set RESETn high and FLASH_P_EN high for 125 µs, then set RESETn low Load Fuse Settings Serial Flash Emulation Reset Doze Deep Sleep Active Power-On Reset Start Up Inactive HW or PMU Event RESETn low and FLASH_P_ENn high VSUPPLY > PoR De-assert RESETn Boot Assert RESETn Assert RESETn Assert RESETn Figure 8 State Diagram – Operating Modes 4.1 Start Up Start Up occurs as a result of either tripping of the power-on-reset circuit or the assertion of RESETn. After the completion of power-on-reset (see Section 2.1.1) or the falling edge of an internally synchronized RESETn, Eterna loads its Fuse Table (see section 4.1.1), including setting I/O direction. In this state, Eterna checks the state of the FLASH_P_ENn and RESETn and enters the serial flash emulation mode, if both signals are asserted. If the FLASH_P_ENn pin is not asserted but RESETn is not asserted, Eterna automatically reduces its energy consumption to a minimum until RESETn is released. Once RESETn is de- asserted, Eterna goes through a boot sequence, and then enters the Active state. 4.1.1 Fuse Table Eterna’s Fuse Table is a 2 KB page in flash that contains two data structures, one for hardware configuration immediately following Power on Reset or the assertion of RESETn and one for configuration of design specific parameters. Hardware support for configuration includes configuration of I/O, preventing I/O leakage from negatively affecting current consumption during power on, which can be a significant issue for current limited supplies. Examples of design-specific parameters include setting of UART modes, clock sources and trim values. Fuse Tables are created via the Fuse Table application software described in 040-0109 Design Specific Configuration Guide. Fuse Tables are loaded into flash using the same software and in-circuit programmer used to load Eterna’s networking software image – see the 040-0110 Eterna Serial Programmer Guide for details. |
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