tda18219hn NXP Semiconductors, tda18219hn Datasheet - Page 13

• Manufacturer Part Number: tda18219hn
• Description: Silicon Tuner For Terrestrial And Cable Digital Tv Reception
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 11.
[1]
Table 12.
TDA18219HN_1
Objective data sheet
Address Register
07h
Address Register
08h
0Ah
Power_Level value is updated only if requested via triggering of MSM_byte_1 and MSM_byte_2.
Input_Power_Level_byte 6 to 0
IRQ_status
IRQ_clear
Power level detector bit descriptions
IRQ bit descriptions
10.1.4 Power level detector
10.1.5 IRQ
Table 10.
[1]
Remark: The power level measurement is not done continuously but only on request
performed by using bytes MSM_byte_1 (19h) and MSM_byte_2 (1Ah):
Remark: This feature purpose is to ease antenna pointing when no picture is displayed on
screen only. In case a power level detection is required while displaying a picture, refer to
software procedure described in application note.
Remark: An IRQ information is generated on IRQ pin (30) that reflects the IRQ_status bit.
The polarity of the pin can be selected with IRQ_Polarity bit at address 0x37h. In Normal
mode of operation, the IRQ status is then raised at the end of the calibration sequence
selected via MSM_byte_1 and MSM_byte_2 and at each new channel.
SM
1
1
1
•
•
•
[1]
All others values are forbidden.
Set MSM_byte_1 to 80h to indicate a power measurement is required
Trigger the measurement by writing 01h in MSM_byte_2
Then read byte Input_Power_Level_byte
Mode selection
Bit
7
7
Bit
SM_LNA
0
1
1
Symbol
IRQ_status
IRQ_clear
Symbol
Power_Level[6:0]
[1]
Rev. 01 — 3 February 2010
…continued
SM_XT
1
0
1
Silicon Tuner for terrestrial and cable digital TV reception
[1]
Access Value
R/W
R/W
Access Value
R
Mode
Standby mode with LT ON and XTOUT OFF
Standby mode with LT OFF and XTOUT ON
Standby mode with LT OFF and XTOUT OFF
(
0
1
0
1
07h) for result
-
Description
The power value is in the range from
40 dBμV (RMS) to 110 dBμV (RMS).
Outside this range, Power_Level
value
Description
•
•
IRQ_clear is set to 1
all calibration sequences selected
by MSM_byte_1 and launched by
MSM_byte_2 are completed
drops the bit IRQ_status
power < 40 dBμV (RMS):
Power_Level = 0
power > 110 dBμV (RMS):
Power_Level = 127
[1]
TDA18219HN
is computed as follows:
© NXP B.V. 2010. All rights reserved.
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