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參數(shù)資料
| 型號： | TEA5760UK/N1/S21,1 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA25 |
| 封裝： | 3 X 2.80 MM, 0.60 MM HEIGHT, WLCSP-25 |
| 文件頁數(shù)： | 2/37頁 |
| 文件大?。?/td> | 209K |
| 代理商： | TEA5760UK/N1/S21,1 |
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TEA5760UK_1
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 14 December 2006
9 of 36
NXP Semiconductors
TEA5760UK
Single chip FM stereo radio
6.17 Power-on reset
After start-up of VCCA and VCCD, a power-on-reset circuit will generate a reset pulse and
the registers will be set to their default values as shown in Table 8. The power-on reset is
effectively generated by VCCD. To prevent any uncontrolled control interface response,
before power is switched on, pin BUSEN must be LOW. The audio output pins are
high-ohmic (hard mute), all other bits are set default according to Table 8.
6.18 Control interface
The I2C-bus operates with a maximum clock frequency of 400 kHz.
6.19 Auto search and preset mode
6.19.1 Search mode
In Search mode the TEA5760UK can search channels automatically.
When the INTX signal is used as an interrupt to the host processor to indicate a search
stop, the INTMSK register must be reset and only the FRRMSK must be set. In this way
the host processor will only be interrupted when the search/preset algorithm is ready.
Search mode is initiated by setting the SM bit to logic 1 in the FRQSET register. When bit
SUD = 0 then it searches down, when SUD=1it searches up. The tuner starts searching
at the frequency where it is or at a new start frequency programmed to the tuner. In the
case the programmed frequency is a valid channel and auto search is initiated, the radio
will stay tuned to programmed frequency. To continue the auto search tune algorithm
under such conditions, an offset frequency relative to the tuned frequency has to be
programmed (for example 100 kHz) to search for subsequent channels. With the Search
Stop Level (SSL) bits the minimum eld strength of channels to be found can be set. The
tuner will stop on a channel with a eld strength equal to or higher than this reference level
and then will check the IF frequency. When both are valid the Search mode terminates. If
the level check or the IF count fails, it keeps on searching. When no channels are found
the TEA5760UK stops searching when it has reached the band limit and the BLFLAG
goes HIGH. A search always stops with the FRRFLAG being set and a hardware interrupt.
Figure 3 describes this procedure.
After this interrupt the TEA5760UK will keep its status and will not update the INTREG,
FRQCHK and TUNCHK tuner registers for a period of 15.625 ms. The state of the
TEA5760UK can be checked by reading tuning registers INTREG, FRQCHK and
TUNCHK. Table 4 shows the possible states after an auto search or a preset.
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