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AS3933 bảng dữ liệu(PDF) 56 Page - ams AG

tên linh kiện AS3933
Giải thích chi tiết về linh kiện  3D Low Frequency Wake-Up Receiver
PDF  64 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
Logo AMSCO - ams AG

AS3933 bảng dữ liệu(HTML) 56 Page - ams AG

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ams Datasheet
Page 55
[v1-08] 2015-Sep-02
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AS3933 − Detailed Description
Figure 64:
Parallel Tuning Capacitance on the LF3P
The Three channels can be tuned separately. The host system
(MCU) has to connect the LC-oscillator to the antenna to
measure the resonance frequency on the pin DAT. The host
should measure the frequency on this pin and just changing
register setting fine tune it to get it as close as possible to the
nominal value of the carrier frequency. With the bits R16<2:0>
it is possible to connect the LC-oscillator to the three different
antennas.
Channel Selection in Scanning Mode and
ON/OFF Mode
In case only 2 channels are active and one of the Low Power
modes is enabled, then the channels 1 and 3 have to be active.
If the chip works in ON-OFF mode and only one channel is active
then the active channel has to be the channel 1. Both Low Power
modes are not allowed to be enabled at the same time.
R19
Capacitance on LF3P
R19<0>=1
Adds 1pF to LF3P
R19<1>=1
Adds 2pF to LF3P
R19<2>=1
Adds 4pF to LF3P
R19<3>=1
Adds 8pF to LF3P
R19<4>=1
Adds 16pF to LF3P



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