TAILIEUCHUNG - Radio Frequency Identification Fundamentals and Applications, Design Methods and Solutions Part 13

Tham khảo tài liệu 'radio frequency identification fundamentals and applications, design methods and solutions part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Tag4M a Wi-Fi RFID Active Tag Optimized for Sensor Measurements 291 tag. If the signal is in the range of 0-10V it is recommended to wire it to the 0-10V V and AGND I O connector terminals. 0-10V measurement is done with a 14-bit precision ADC with accuracy in the - 5mV range. If the signal is in the range of 0-400mV is recommended to wire it to one of the channels AI0 AI1 or AI2 referenced in AGND to increase the resolution at 14-bit. Channels AI0 1 2 have current drive capability which can be enabled in software and it should be used when reading thermistors or other sensors that need current excitation. Channel 4-20mA is assigned to current sensors. DIO lines 0 1 2 3 are general input output digital lines TTL compatible. Power consumption Tag power consumption is very much determined by the task the tag runs at any given moment in time. Generally speaking the tag is running in power cycles each cycle contains a period of sleep and a period of wake time. Inside a cycle during the periods of sleep and wake the tag executes distinct tasks in terms of amount of powered required and time to execute. Figure 5 bellow shows the current consumption and length of time for each of these tasks during one cycle when the tag is powered by a Lithium battery. Total cycle length of time is between 150 and 500msec. Fig. 5. Current consumption and Function Periods The tag Wi-Fi radio module was designed for three distinct power domains in order to achieve flexible power management and lower power consumption. These power domains are G2 Microsystems 2008 c Sleep Mode when the tag is in sleep mode the tag executes the minimum amount of tasks and by that consumes the minimum amount of power to stay alive. In sleep mode power consumption is in the microwatts range while the CPU and almost all tag components are not available. The following limited number of functions will run in this mode - decrement timers and detect expiry - detect the state change of switch sensors

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