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| 型号： | MAX9851EVCMODU |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 编解码器 |
| 英文描述： | MAX9851评估板/评估系统 |
| 中文描述： | PCM CODEC |
| 文件页数： | 37/73页 |
| 文件大小： | 1357K |
| 代理商： | MAX9851EVCMODU |
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MAX9851/MAX9853
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
42
______________________________________________________________________________________
connected, HPR and HPL are pulled high by the inter-
nal sense bias. To detect the balanced mono configu-
ration, set HSTEST to 10 to enable Test 2. Test 2
connects a small pulldown current to HPR and a pullup
to HPL. A balanced mono speaker will result in HPL
pulled low whereas an open circuit would still allow
HPL to be pulled high by AVDD. Attempting to detect
the headphone configuration while the amplifiers are
active will lead to erroneous results as the outputs of
the active headphone amplifiers are biased at 0V.
In normal headset detect mode, the removal or inser-
tion of a jack, as monitored by EXTMICBIASL, triggers
an interrupt on the IRQ pin. The state changes that trig-
ger an interrupt are shown in Table 6. Alternatively, set
IHSD = 1 (register 0x02, bit B1) to cause all changes in
the HSDET bits to trigger an interrupt. Changes to
HSDET are digitally debounced with a 20ms filter.
Interrupt Output
Hardware interrupts are reported on the MAX9851/
MAX9853 open-drain IRQ pin. The interrupt pin can be
triggered by the sources shown in Table 7. When an
interrupt occurs, IRQ remains low until the interrupt is
serviced by reading the status register 0x00. If an
interrupt occurs, it will be reported only if the corre-
sponding interrupt enable is set in register 0x02 (see
the I2C Registers and Bit Descriptions section for
detailed register definitions).
HSTEST(1:0)
CONFIGURATION
00
Headphone sense bias disconnected
01
Headphone sense test 1 (standard
headphone detection)
10
Headphone sense test 2 (balanced mono
headphone detection)
11
Reserved
Table 5. Headphone Detect Test Modes
PIN-STATE CHANGE
DESCRIPTION
EXTMICBIASL: high
low or mid
Headset inserted
EXTMICBIASL: mid
low
Hook switch pressed
EXTMICBIASL: low
mid
Hook switch released
EXTMICBIASL: low
high
Headset removed
Table 6. Headset Pin Changes Causing
Hardware Interrupts
INTERRUPT SOURCES
MASKABLE IN
REGISTER (0x02)
Clip Detect
Yes
Slew Level Detect
Yes
Digital PLL UnLock
Yes
Headset Configuration Change
Yes
Headset Removal and Insertion
No
Speaker/External Fault
Yes
Table 7. Sources of Hardware Interrupts
ACTIVATE HEADSET
DETECT CIRCUITRY
HPR AND
HPL
HIGH
LOW
PERFORM
HEADPHONE SENSE
TEST 1
STEREO
HEADPHONES
PERFORM
HEADPHONE SENSE
TEST 2
BALANCED MONO
HEADPHONES
NO
HEADPHONES
Figure 9. Headphone Detection Procedure
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9851EVKIT | 功能描述:音频 IC 开发工具 Evaluation Kit/Evaluation System for the MAX9851 RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX9853ETM+ | 功能描述:接口—CODEC Stereo Audio CODEC w/DirectDrive Amp RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| MAX9853ETM+T | 功能描述:接口—CODEC Stereo Audio CODEC w/DirectDrive Amp RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| MAX9853EVCMODU | 功能描述:音频 IC 开发工具 Evaluation Kit/Evaluation System for the MAX9853 RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX9853EVKIT | 功能描述:音频 IC 开发工具 Evaluation Kit/Evaluation System for the MAX9853 RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
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