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參數(shù)資料
| 型號： | LM4935 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | ADC |
| 英文描述： | Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC |
| 中文描述： | 音頻子系統(tǒng)的雙模單聲道立體聲耳機和揚聲器放大器的高效率和多功能模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 50/112頁 |
| 文件大?。?/td> | 5017K |
| 代理商： | LM4935 |
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12.0 Status & Control Registers
(Continued)
12.29 HEADSET DETECT OVERVIEW
The LM4935 has built in monitors to automatically detect headset insertion or removal. The detection scheme can differentiate
between mono, stereo, mono-cellular and stereo-cellular headsets. Upon detection of headset insertion or removal, the LM4935
updates read-only bit 0 - headset absence/presence, bit 1- mono/stereo headset and bit 2 - headset without mic / with mic, of the
STATUS register (0x18h). Headset insertion/removal and headset type can also be detected in standby mode; this consumes no
analog supply current when the headset is absent.
The LM4935 can be programmed to raise an interrupt (set the IRQ pin high) when headset insert/removal is sensed by setting
bit 0 of DETECT (0x17h). When headset detection is enabled in active mode and a headset is not detected, the HPL_OUT and
HPR_OUT amplifiers will be disabled (switched off for capless mode and muted forAC-coupled mode) and the EXT_BIAS pin will
be disconnected from the MIC_BIAS amplifier, irrespective of control register settings.
The LM4935 also has the capability to detect button press, when a button is present on the headset microphone. Both parallel
button-type (in parallel with the headset microphone, default value) and series button-type (in series with the headset micro-
phone) can be detected; the button type used needs to be defined in bit 3 of MIC_2 (0x0Ch). Button press can also be detected
in stand-by mode; this consumes 10 μA of analog supply current for a series type push button and 100 μA for a parallel type push
button. Upon button press, the LM4935 updates bit 3 of STATUS (0x18h). In active OCL mode, with internal microphone selected
(INT_EXT = 0; (reg 0x0Bh)), if a parallel pushbutton headset is inserted into the system, INT_EXT must be set high before BTN
(bit 3 of STATUS (0x18h)) can be read. The LM4935 can also be programmed to raise an interrupt on the IRQ pin when button
press is sensed by setting bit 1 of DETECT.
The LM4935 provides debounce programmability for headset and button detect. Debounce programmability can be used to reject
glitches generated, and hence avoid false detection, while inserting/removing a headset or pressing a button.
Headset insert/removal debounce time is defined by HS_DBNC_TIME; bits 6:3 of DETECT (0x17h). Parallel button press
debounce time is defined by BTN_DBNC_TIME; bits 5:4 of MIC_2 (0x0Ch).
Note that since the first effect of a series button press (microphone disconnected) is indistinguishable from headset removal, the
debounce time for series button press in defined by HS_DBNC_TIME.
Headset and push button detection can be enabled by setting CHIP_MODE 0; bit 0 of BASIC (0x00h). For reliable headset / push
button detection all following bits should be defined before enabling the headset detection system:
1) the OCL-bit (AC-Coupled / Capless headphone interface (bit 7 of BASIC (0x00h))
2) the headset insert/removal debounce settings (bit 6:3 of DETECT (0x17h))
3) the BTN_TYPE-bit (Parallel / Series push button type (bit 3 of MIC_2 (0x0Ch))
4) the parallel push button debounce settings (bit 5:4 of MIC_2 (0x0Ch))
Figure 8 shows terminal connections and jack configuration for various headsets. Care should be taken to avoid any DC path from
the MIC_DET pin to ground when a headset is not inserted.
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LM49350 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Audio Codec Sub-System with a Ground-Referenced Stereo Headphone Amplifier |
| LM49350RL | 制造商:Texas Instruments 功能描述:Audio Codec 1ADC / 1DAC 36-Pin uSMD T/R 制造商:Texas Instruments 功能描述:AUDIO CODEC SUBSYSTEM 36MICRO SMDXT |
| LM49350RL/NOPB | 功能描述:接口—CODEC Hi Perf Audio Codec Subsystem RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel |
| LM49350RL/NOPB | 制造商:Texas Instruments 功能描述:Audio Codec IC |
| LM49350RLEVAL | 功能描述:音頻 IC 開發(fā)工具 LM49350RL EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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