TEF668XA系列设备V205用户手册：接口控制与功能概述

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TEF668XA系列用户手册，包括TEF6686A、TEF6687A、TEF6688A和TEF6689A，版本V205，是由NXPSemiconductors公司提供的。这份文档详细介绍了该系列设备的控制接口，特别是API（应用程序编程接口）的概述，以及与之相关的I²C总线通信技术。该系列产品的核心功能集中在音频调谐器上，其特点是具有广泛的频率范围，从早期版本的5.00升级到V205时，增加了FM调谐范围至64MHz，这在第3.1节有所提及。用户手册的主要内容围绕以下几个关键点展开： 1. **概述**：文档首先提供了关于TEF668XA系列设备的整体介绍，强调了其作为一款用于音频调谐控制的专用集成电路的特性。 2. **保密性**：所有文档内容受法律免责声明约束，体现了商业敏感性和知识产权保护。 3. **联系信息**：NXPSemiconductors鼓励用户查询更多信息或购买服务可通过官方网址访问（http://www.nxp.com），对于销售办公室地址，可以通过电子邮件salesaddresses@nxp.com获取。 4. **修订历史**：手册的历史更新记录从1.5版到1.6版，主要更改包括FM调谐范围扩展、API初始化过程的更新（6.2.1、6.2.2、6.2.3部分），以及新增或修改的命令“c”（6.3.4部分）。 5. **控制接口**：重点在于V205版本的控制接口设计，它允许通过I²C总线进行设备控制，这对于开发者来说是至关重要的，因为它提供了与硬件交互的标准化方法。 6. **关键词**：Lithio品牌，以及具体的型号如TEF6686A、TEF6687A、TEF6688A和TEF6689A，都是与这个系列设备紧密相关的搜索标签。这份用户手册是开发人员和系统集成者在使用TEF668XA系列设备时的重要参考资料，提供了详细的技术规格、安装指南、功能操作和维护信息，确保用户能充分利用这些产品的特性以实现高效和精确的音频调谐功能。

NXP Semiconductors

TEF668XA User Manual

TEF6686A, TEF6687A, TEF6688A and TEF6689A, /V205

doc

All information provided in this document is subject to legal disclaimers.

User Manual

Rev. 1.6 — 18 August 2016

16 of 143

3.5 FM cmd 12 Set_Antenna

Antenna signal attenuation control (RF AGC minimum limit).

In case of an active antenna application part of the required level correction can be

located in the front-end.

module

cmd

Set_Antenna

attenuation, off_mode

index

attenuation

[ 15:0 ]

LNA gain reduction

0 / 60 / 120 / 180 / 240 / 300 / 360 (*0.1 dB) = 0 … 36 dB antenna

attenuation (6 dB step size)

0 = no attenuation (default)

off_mode

[ 15:0 ]

FM LNA attenuation setting used during FM off

300 = 30 dB attenuation; FM LNA input impedance is medium

420 = 42 dB attenuation; FM LNA input impedance is low (default)

Application example

FM_Set_Antenna (1, 60)

FM_Set_Antenna (2, 300)

FM 6 dB antenna attenuation

FM medium imp. when ‘off’ (indexed)

I²C example (hex)

[ w 20 0C 01 003C ]

[ w 20 0C 02 012C ]

FM 6 dB antenna attenuation

FM medium imp. when ‘off’ (indexed)

Note: parameter ‘attenuation’ can realize a certain amount of antenna signal attenuation

by limitation of the minimum AGC setting. This function is not for general FM use.

Note: FM command parameter ‘off_mode’ can set a higher than default FM input

impedance when FM reception is disabled (i.e. radio-standby or AM operation). This

function is primarily intended for multi-tuner applications with shared antenna to avoid FM

antenna signal attenuation at the other tuner.

For AM operation see chapter 3.32 AM cmd 12 Set_Antenna.

NXP Semiconductors

TEF668XA User Manual

TEF6686A, TEF6687A, TEF6688A and TEF6689A, /V205

doc

All information provided in this document is subject to legal disclaimers.

User Manual

Rev. 1.6 — 18 August 2016

18 of 143

3.8 FM cmd 23 Set_NoiseBlanker

Noise blanker option and sensitivity settings.

module

cmd

Set_NoiseBlanker

mode, sensitivity, level_sensitivity (, modulation, offset, attack, decay)

index

mode

[ 15:0 ]

noise blanker

0 = off

1 = on (default)

sensitivity

[ 15:0 ]

trigger sensitivity

500 … 1500 [*0.1 %] = 50 … 150 % relative trigger sensitivity

1000 = 100 % (default)

level_sensitivity

[ 15:0 ]

trigger sensitivity on level detection

500 … 1500 [*0.1 %] = 50 … 150 % relative trigger sensitivity

1000 = 100 % (default)

modulation

[ 15:0 ]

extended API: modulation dependency on trigger sensitivity

330 … 1660 [*0.1 %] = 33 … 166 % modulation (= 25 … 125 kHz FM dev.)

Modulation index where minimum pulse detection sensitivity is reached;

trigger sensitivity is controlled between maximum sensitivity for no

modulation and minimum sensitivity at set modulation index

1250 = 125 % (default)

offset

[ 15:0 ]

extended API: sensitivity offset

25 … 200 [*0.1 %] = 2.5 … 20 % fixed sensitivity threshold

Pulse detection offset; prevent false triggering in good signal conditions

80 = 8 % (default)

attack

[ 15:0 ]

extended API: trigger reference attack time

15 … 1200 [*1 µs] = 15 … 1200 µs

Attack time of noise average filter used as reference for pulse detection

900 = 900 µs (default)

decay

[ 15:0 ]

extended API: trigger reference decay time

150 … 6000 [*1 µs] = 150 µs … 6 ms

Decay time of noise average filter used as reference for pulse detection

900 = 900 µs (default)

Application example

FM_Set_NoiseBlanker (1, 1, 1000, 1000)

FM_Set_NoiseBlanker (1, 1, 1000, 1000, 1250, 80, 900, 900)

FM default values

defaults extended API

I²C example (hex)

[ w 20 17 01 0001 03E8 03E8 ]

[ w 20 17 01 0001 03E8 03E8 04E2 0050 0384 0384 ]

FM default values

defaults extended API

Note: Extended API control parameters 4 to 7 are available for additional performance

tuning. Change of default values is not advised in general but allows for performance

fine-tuning on specific conditions. Feature innovation may cause extended API defaults

and control to change with firmware release.

NXP Semiconductors

TEF668XA User Manual

TEF6686A, TEF6687A, TEF6688A and TEF6689A, /V205

doc

All information provided in this document is subject to legal disclaimers.

User Manual

Rev. 1.6 — 18 August 2016

19 of 143

Note: Extended API control parameters 4 to 7 are incompatible with version V102 (p2.21

and later) and different defaults and ranges apply. Re-use of V102 values is not possible

and will cause sub-standard performance.

For AM operation see chapter 3.34 AM cmd 23 Set_NoiseBlanker.

3.9 FM cmd 24 Set_NoiseBlanker_Options

Extended API control options of the FM noise blanker.

module

cmd

Set_NoiseBlanker_Options

blank_time, blank_time2, blank_modulation, blank_time_level

index

blank_time

[ 15:0 ]

noise blanker blank time on low modulation

75 … 300 [*1 µs] = 75 … 300 µs pulse stretch time

Blank time for low modulation; compared to parameter ‘blank_time2’ an

equal or longer value is suggested optimized for noise pulse suppression

225 = 225 µs (default)

blank_time2

[ 15:0 ]

noise blanker blank time on high modulation

75 … 300 [*1 µs] = 75 … 300 µs pulse stretch time

Blank time for high modulation; compared to parameter ‘blank time’ an

equal or smaller value is suggested optimized for modulation fidelity

112 = 112 µs (default)

blank_modulation

[ 15:0 ]

modulation dependent blank time

160 … 1660 [*0.1 %] = 16 … 166 % modulation (= 12 … 125 kHz FM dev.)

Modulation index threshold for which the blank time is adapted;

the ‘blank_time’ setting is used below the set modulation index and the

‘blank_time2’ setting is used above the set modulation index

250 = 25 % (default)

blank_time_level

[ 15:0 ]

noise blanker blank time on level detection

100 … 400 [*1 µs] = 100 … 400 µs pulse stretch time

225 = 225 µs (default)

Application example

FM_Set_NoiseBlanker_Options (1, 225, 112, 250, 225)

Extended API default values

I²C example (hex)

[ w 20 18 01 00E1 0070 00FA 00E1 ]

Extended API default values

Note: Extended API control as available from this command is not advised in general but

allows for performance fine-tuning on specific conditions. Feature innovation may cause

extended API defaults and control to change with firmware release.

Note: Extended API control defaults differ from version V102 (p2.21 or later) and are new

advised values. Re-use of V102 values is not suggested for optimal performance.

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