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SL13A-ASWB Datenblatt(PDF) 11 Page - ams AG |
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SL13A-ASWB Datenblatt(HTML) 11 Page - ams AG |
11 / 49 page ams Datasheet: 2014-May-06 [v1-01] SL13A – 11 Fu n c t i o n a l D e s c r i p t i o n Figure 11, “State Transition Diagram,” on page 13 shows the command overview. Figure 14, “cool-Log™ Command Overview,” on page 14 shows the different states and their interactions. Initializing the Chip A virgin chip (not initialized) can be initialized either through the SPI bus or through the electromagnetic field from a reader in the standby mode. The power source is either from a battery (VBAT) or extracted from the RF field via the AFE circuit. After the initializing procedure, the chip will enter the ready mode. If the External-Sensor flag is set, an external analog output sensor can be connected to the SEXT pin. Ready State In the ready mode, all parameters can be set, read and changed through a reader with the appropriate passwords. Active State In active mode, the real-time clock (RTC) is running, the desired parameters are set and the on-chip temperature sensor is in standby. Logging State A log flag from the timer will enable the logging mode in which the sensor and the A/D converter will be activated, and the measured value will be stored in the EEPROM together with the time of the event. If the External Sensor flag is set, the external sensor will also be activated and the measured data stored. The A/D converter can be multiplexed between internal temperature sensor, external sensor or battery voltage. After the event, the chip will return to the active mode. During the time of the logging procedure, the chip will not be able to receive any RF command. If an RF command is sent during this time, the chip will ignore it and will not send any reply. Functional Description |
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