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ST25DV04K Datasheet(PDF) 60 Page - STMicroelectronics |
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ST25DV04K Datasheet(HTML) 60 Page - STMicroelectronics |
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60 / 220 page  ST25DVxxx specific features ST25DV04K ST25DV16K ST25DV64K 60/220 DocID027603 Rev 4 5.3.2 Energy harvesting feature description The usage of Energy Harvesting element can be defined in configuration register EH_MODE. When the Energy harvesting mode is disabled or the RF field strength is not sufficient, the energy harvesting analog voltage output V_EH is in High-Z state. EH_MODE Static Register is used to define the Energy Harvesting default strategy after boot. At boot EH_EN (in EH_CTRL_Dyn register) is set depending EH_MODE value as shown in table below: Writing 0 in EH_MODE at any time after boot will automatically set EH_EN bit to 1, and thus activate energy harvesting. Writing 1 in EH_MODE at any time after boot will not modify EH_EN bit (until next reboot) and thus will not modify energy harvesting current state. EH_CTRL_Dyn allows to activate or deactivate on the fly the Energy harvesting (EH_EN) and bring information on actual state of EH and state of power supplies : • EH_ON set reflects the EH_EN bit value • FIELD_ON is set in presence of a RF field • VCC_ON is set when Host power supply is on, and low power-down mode is not forced. During boot, EH is not delivered to avoid alteration in device configuration. Caution: Communication is not guaranteed during EH delivery. Refer to the application note AN4913 (Energy harvesting delivery impact on ST25DVxxx behavior during RF communication). Energy harvesting can be set even if ST25DVxxx is in RF disabled or RF Sleep mode, or in Low power mode. In all these cases, ST25DVxxx will deliver power on V_EH pin if RF field is present. Energy harvesting voltage output is not regulated. 1. Refer to Table 9: Dynamic registers memory map for the EH_CTRL_Dyn register. Table 25. Energy harvesting at power-up EH_MODE EH_EN (at boot) Energy harvesting at power-up 0 1 EH enabled after boot (when possible) 10 EH disabled initially, EH delivered on demand (when possible) |
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