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TDC-GP21 Datasheet(PDF) 44 Page - ams AG

No. de pieza TDC-GP21
Descripción Electrónicos  Ultrasonic-Flow-Converter
PDF  91 Pages
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Fabricante Electrónico  AMSCO [ams AG]
Página de inicio  http://www.ams.com
Logo AMSCO - ams AG

TDC-GP21 Datasheet(HTML) 44 Page - ams AG

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TDC-GP21
acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de
3-19
parameter CYCLE_TEMP in multiples of 50 Hz or 60 Hz. The right selection of the
delay between the two measurements suppresses 50/60 Hz noise.
CYCLE_TEMP
factor
HZ60 = 0 (50Hz)
HZ60 = 1 (60Hz)
0
1
20 ms
16.67 ms
1
1.5
30 ms
25.00 ms
2
2
40 ms
33.33 ms
3
2.5
50 ms
41.67 ms
’h03, Start_Cal_Resonator: Triggers a calibration measurement of the high speed
oscilator. The TDC measures a time interval between 61 µs and 488 µs, specified
in ANZ_PER_CALRES. The end of the measurement is indicated by the interrupt.
The result, in multiples or the high speed clock period, is stored in result register
0. Dividing this by the theoretical value gives the correction factor.
’h04, Start_Cal_TDC: This command starts a measurement of 2 periods of the
reference clock. It is used to update the calibration raw data. Typically, the chip is
configured for auto-calibration and this command is not necessary.
3.4.2
SPI Sample
Figure 3-1: Sample scope picture for sequence INIT ’h70 and Start_Cal_TDC = ’h04
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