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首页NXP TEA685X系列FM芯片V102规格详解与接口指南
NXP TEA685X系列FM芯片V102规格详解与接口指南
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更新于2024-07-16
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NXP半导体公司的TEA685X系列(包括TEA6850、TEA6851、TEA6852和TEA6853)是一款专门设计用于无线音频应用的FM芯片,特别是针对FM调谐器和广播接收器的开发。这份名为"TEA685XUserManual / V102"的文档详细描述了该设备的规格和技术特性,版本号为V102,对应的是固件版本2.00。 该手册的重点在于提供了对TEA685X系列的全面控制接口概述,即Application Programming Interface (API),这使得开发者能够高效地与硬件进行通信,实现对FM功能如频道搜索、频率设置、音量控制等的精确操作。通过I²C总线接口,开发者可以实现远程控制和配置,这对于简化系统集成和降低功耗具有重要意义。 文档涵盖了关键信息,如产品关键词"Tiger-2",表明这是针对特定应用或性能优化的一个版本。此外,还强调了修订历史,指出从V102用户手册的Rev.1.5版本到Rev.1.6,主要更新了3.25、3.29和4.6部分的内容,修正了示例和表格中的错误。在3.32修订中,将55.4667MHz的参考频率统一为55.46667MHz,以保持与其他文档的一致性,但这一更改并不涉及控制接口的改动,因此无需重新编程。 此文档的法律免责声明部分指出,所有提供的信息受版权保护,未经NXP许可不得随意复制或使用。用户若需更多信息,可访问NXP官方网站或发送邮件至指定的销售地址获取支持。这份详细的手册对于理解和开发基于TEA685X系列的音频产品至关重要,无论是嵌入式系统设计师还是无线电工程师,都能从中找到所需的技术指导和参考资料。
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NXP Semiconductors
TEA685X User Manual
TEA6850, TEA6851, TEA6852 and TEA6853, /V102
doc
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User Manual
Rev. 1.6 — 17 February 2015
14 of 84
3.6 FM cmd 20 Set_MphSuppression
Available for TEA6851, TEA6852 and TEA6853 only.
Optional use of the ‘EMS’ FM multipath suppression system.
module
32
FM
cmd
20
Set_MphSuppression
mode
index
1
mode
[ 15:0 ]
FM multipath suppression
0 = off (default)
1 = on
Application example
FM_Set_MphSuppression (1, 1)
FM_Set_MphSuppression (1, 0)
Enable the multipath suppression
Disable the multipath suppression
I²C example (hex)
[ w 20 14 01 0001 ]
[ w 20 14 01 0000 ]
Enable the multipath suppression
Disable the multipath suppression
Note: The advised setting is ‘on’ for improved field performance.
NXP Semiconductors
TEA685X User Manual
TEA6850, TEA6851, TEA6852 and TEA6853, /V102
doc
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User Manual
Rev. 1.6 — 17 February 2015
15 of 84
3.7 FM / AM cmd 23 Set_NoiseBlanker
Noise blanker options and sensitivity setting.
module
32 / 33
FM / AM
cmd
23
Set_NoiseBlanker
mode, sensitivity
index
1
mode
[ 15:0 ]
noise blanker
0 = off
1 = on (default)
2
sensitivity
[ 15:0 ]
trigger sensitivity
500 … 1500 [*0.1 %] = 50 … 150 % relative trigger sensitivity
1000 = 100 % (default)
Application example
FM_Set_NoiseBlanker (1, 1, 1000)
AM_Set_NoiseBlanker (1, 1, 1000)
AM_Set_NoiseBlanker (1, 1, 1200)
FM default values
AM default values
I²C example (hex)
[ w 20 17 01 0001 03E8 ]
[ w 21 17 01 0001 03E8 ]
[ w 21 17 01 0001 04B0 ]
FM default values
AM default values
3.8 AM cmd 24 Set_NoiseBlanker_Audio
AM Audio noise blanker options and sensitivity setting.
module
33
AM
cmd
24
Set_NoiseBlanker_Audio
mode, sensitivity
index
1
mode
[ 15:0 ]
AM audio noise blanker (audio frequency detection)
0 = off
1 = on (default)
2
sensitivity
[ 15:0 ]
AM audio noise blanker trigger sensitivity
500 … 1500 [*0.1 %] = 50 … 150 % relative trigger sensitivity
1000 = 100 % (default)
Application example
AM_Set_NoiseBlanker_Audio (1, 1, 1000)
AM_Set_NoiseBlanker_Audio (1, 1, 1200)
AM default values
I²C example (hex)
[ w 21 18 01 0001 03E8 ]
[ w 21 18 01 0001 04B0 ]
AM default values
NXP Semiconductors
TEA685X User Manual
TEA6850, TEA6851, TEA6852 and TEA6853, /V102
doc
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User Manual
Rev. 1.6 — 17 February 2015
16 of 84
3.9 FM / AM cmd 30 Set_DigitalRadio
Available for TEA6853 only.
Enabling of signal lines for external digital radio processor; DR I²S output.
Note: See 3.20 FM / AM cmd 84 Set_DR_Options for additional digital radio options.
module
32 / 33
FM / AM
cmd
30
Set_DigitalRadio
mode
index
1
mode
[ 15:0 ]
digital radio
0 = off (default)
1 = on
Application example
FM_Set_DigitalRadio (1, 1)
AM_Set_DigitalRadio (1, 1)
Enable digital radio for FM use
Enable digital radio for AM use
I²C example (hex)
[ w 20 1E 01 0001 ]
[ w 21 1E 01 0001 ]
Enable digital radio for FM use
Enable digital radio for AM use
3.10 FM cmd 31 Set_Deemphasis
Selection of FM deemphasis time constant
module
32
FM
cmd
31
Set_Deemphasis
timeconstant
index
1
timeconstant
[ 15:0 ]
deemphasis time constant
0 = off; for evaluation purposes only
500 = 50 s deemphasis (default)
750 = 75 s deemphasis
Application example
FM_Set_Deemphasis (1, 750)
75 s deemphasis
I²C example (hex)
[ w 20 1F 01 02EE ]
75 s deemphasis
NXP Semiconductors
TEA685X User Manual
TEA6850, TEA6851, TEA6852 and TEA6853, /V102
doc
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2015. All rights reserved.
User Manual
Rev. 1.6 — 17 February 2015
17 of 84
3.11 FM / AM cmd 38 Set_LevelStep
Selection of level correction as a function of the tuner front-end AGC.
The level step offset is included in the weak signal handling and the level read value of
Get_Quality (4.1 FM / AM cmd 128 / 129 Get_Quality).
A setting of 0 dB will show no level change by full compensation of the actual -6 dB AGC
attenuation step. Instead a setting of -6 dB will show the actual AGC attenuation step.
module
32 / 33
FM / AM
cmd
38
Set_LevelStep
step1, step2, step3, step4, step5, step6, step7
index
1
step1
[ 15:0 ]
level offset for an AGC step from 0 to 1
-60 … 0 (*0.1 dB) = -6 … 0 dB
-20 = -2 dB (FM default) / -10 = -1 dB (AM default)
2
step2
[ 15:0 ]
level offset for an AGC step from 1 to 2
-60 … 0 (*0.1 dB) = -6 … 0 dB
-30 = -3 dB (FM default) / -20 = -2 dB (AM default)
3
step3
[ 15:0 ]
level offset for an AGC step from 2 to 3
-60 … 0 (*0.1 dB) = -6 … 0 dB
-40 = -4 dB (FM default) / -30 = -3 dB (AM default)
4
step4
[ 15:0 ]
level offset for an AGC step from 3 to 4
-60 … 0 (*0.1 dB) = -6 … 0 dB
-50 = -5 dB (FM default) / -40 = -4 dB (AM default)
5
step5
[ 15:0 ]
level offset for an AGC step from 4 to 5
-60 … 0 (*0.1 dB) = -6 … 0 dB
-60 = -6 dB (FM default) / -50 = -5 dB (AM default)
6
step6
[ 15:0 ]
level offset for an AGC step from 5 to 6
-60 … 0 (*0.1 dB) = -6 … 0 dB
-60 = -6 dB (default)
7
step7
[ 15:0 ]
level offset for an AGC step from 6 to 7 (or higher)
-60 … 0 (*0.1 dB) = -6 … 0 dB
-60 = -6 dB (default)
Application example
AM_Set_LevelStep(1, 0, -10, -20, -30, -40, -50, -60)
AM_Set_LevelStep(1, -20, -30, -40, -50, -60, -60, -60)
AM increased level extension
AM decreased level extension
I²C example (hex)
[ w 21 26 01 0000 FFF6 FFEC FFE2 FFD8 FFCE FFC4 ]
[ w 21 26 01 FFEC FFE2 FFD8 FFCE FFC4 FFC4 FFC4 ]
AM increased level extension
AM decreased level extension
Note: Adaptation of the LevelStep default values is not advised in general but allows for a
specific fine-tuning of the weak signal handling in high signal conditions.
Note: The indicated steps are the added values of feedback and input AGC steps.
Note: AGC steps higher than step 7 will employ the step 7 setting.
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