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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ST25R3920B 데이터시트(PDF) 40 Page - STMicroelectronics |
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ST25R3920B 데이터시트(HTML) 40 Page - STMicroelectronics |
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40 / 158 page  Application information ST25R3920B 40/158 DS13890 Rev 4 The AM regulator, together with the am_filt bits, and circuitry behind, creates the reference for the filter curve. A larger value of am_filt results in a larger time constant of the VDD_AM regulator, and a slower signal transition. All timer names in AWS register that end with “1” (for instance, tmodsw1) represent the timer starts at falling edge. Similarly, all timer names that end with ‘2’ (for instance, tmodsw2) mean that the timer starts at rising edge (end of modulation). The typical preset values for slow, medium and fast transients in OOK and ASK can be applied by setting as showed in the below table: Note: The settings must be adjusted individually with the final antenna. Table 5. Typical preset values for slow, medium and fast transients in OOK and ASK Slow transient Medium transient Fast transient AWS Config 2 = 0xXCh AWS Config 2 = 0xX8h AWS Config 2 = 0xX4h AWS time 1 = 0x01h AWS time 1 = 0x01h AWS time 1 = 0x01h AWS time 3 = 0x9Ch AWS time 3 = 0x79h AWS time 3 = 0x57h AWS time 4 = 0x0Ah AWS time 4 = 0x07h AWS time 4 = 0x06h |
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