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TDA18271HD 데이터시트(PDF) 40 Page - NXP Semiconductors

부품명 TDA18271HD
상세설명  Silicon Tuner IC
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TDA18271HD 데이터시트(HTML) 40 Page - NXP Semiconductors

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TDA18271HD_4
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 19 May 2009
40 of 70
NXP Semiconductors
TDA18271HD
Silicon Tuner IC
9.4.15 Flowchart TDA18271ThermometerRead
Table 39.
TDA18271CalcCALPLL
Function
Description
Reference
Description
finds the correct values for the bytes CPD, CD1,
CD2, CD3 and update the tuner registers
Input
freq_input, MS
Table
CAL_PLL_map
Table 48 “CAL_PLL_map”
Output
-
Fig 19. Flowchart TDA18271CalcCALPLL
001aah055
Tuner registers update
Internal table
I2C-bus
Start TDA18271CalcCALPLL
End TDA18271CalcCALPLL
Div
CAL_DIV
CAL_POST_DIV
freq_input
CAL_PLL_map
freq_input
CAL_POST_DIV
Div
CAL_DIV
CD1 = (CAL_DIV / 216) & 7Fh
CD2 = (CAL_DIV / 28)
CD3 = CAL_DIV
-
CPD … CD3
-
-
CPD = CAL_POST_DIV
Find CAL_POST_DIV, Div = fLO(max) in CAL_PLL_map
Update CPD byte
CAL_DIV = (Div
× freq_input × 27) / 125
Update CD1, CD2, CD3 bytes
MS
Table 40.
TDA18271ThermometerRead
Function
Description
Reference
Description
turns the on-chip temperature sensor ON,
reads the current temperature on the die and
then turns the temperature sensor OFF
Input
MS
Table
THERMOMETER_map
Table 52 “THERMOMETER_map”
Output
TMVALUE (temperature in
°C)


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