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ST25DV04K 数据表(PDF) 47 Page - STMicroelectronics |
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ST25DV04K 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 220 page  DocID027603 Rev 4 47/220 ST25DV04K ST25DV16K ST25DV64K ST25DVxxx specific features 219 RF_INTERRUPT: • A pulse is emitted on GPO by Manage GPO command (interrupt). • When RF_INTERRUPT is activated, a pulse of duration IT_TIME is emitted after EOF of ST25DV response to a Manage GPO interrupt command (see Section 7.6.30: Manage GPO). Figure 14. RF_INTERRUPT chronogram FIELD_CHANGE: • A pulse is emitted on GPO to signal a change in RF field state. • When FIELD_CHANGE is activated, and when RF field appear or disappear, GPO emits a pulse of duration IT_TIME. • In case of RF field disappear, the pulse is emitted only if VCC power supply is present. • If RF is configured in RF_SLEEP mode, field change are not reported on GPO, even if FIELD_CHANGE event is activated, as shown in Table 15. |
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