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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS3955 датащи(PDF) 18 Page - ams AG |
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AS3955 датащи(HTML) 18 Page - ams AG |
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18 / 111 page  Page 18 ams Datasheet Document Feedback [v1-01] 2015-Apr-29 AS3955 − Detailed Description Passive Wake-Up AS3955 is able to operate NFC tag operations standalone and fully powered by the RF field. The connected MCU can remain is standby/sleep mode as long as its intervention is not required by the application, in order to save power. AS3955 can be configured to notify the MCU through a wake-up interrupt. A number of triggering events can be selected, e.g.: • Power up • SELECTED state entered • Reception of SLP_REQ command • NFC device has updated memory content For a complete interrupt source list, please refer to the section Interrupt Registers. Chip Kill Some applications require that the RF link is active only under certain conditions, e.g. during device configuration only in a controlled environment like a production facility. AS3955 can be configured by the MCU in order to restrict the NFC device access to the system. By setting the Configuration Byte CHIP_KILL in EEPROM, the MCU can disable access to SPI / I²C from the RF link (i.e. Tunneling and Extended mode are permanently disabled), or even disable RF communication completely. In the latter case, AS3955 will not respond to incoming RF commands. This configuration can be modified only by the MCU through SPI / I²C interfaces. |
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