参数资料
| 型号： | SC900841JVKR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 142/192页 |
| 文件大小： | 0K |
| 描述： | IC POWER MGT 338-MAPBGA |
| 标准包装： | 2,000 |
| 应用： | PC，PDA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 338-TFBGA |
| 供应商设备封装： | 338-MAPBGA |
| 包装： | 带卷 (TR) |
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FUNCTIONAL DEVICE OPERATION
AUDIO
Table 87. Microphone Bias Parametric Specifications
Microphone Detect Current Low
MC2BEN=1
50
μ A
Microphone Detect Current High
MC2BEN=1
500
650
μ A
Notes
29. For proper detection it is advised to use a microphone bias resistor not exceeding 2.7 k Ω
In case the supply voltage level is thought to be insufficient
for digital microphones, the supply at MC1B can be raised
from 2.1 to 2.7 V by setting the MIC1BIASMOD bit. However
in this case, the output supply is no longer low noise. Raising
the supply at MC1B has no effect on the output voltage at
MC2B.
The microphone bias MC2B has an integrated accessory
detection circuit for headphones, headset/microphone
presence and for a button operation placed in parallel to the
microphone. In order to operate properly, the headset must
connect the microphone ring of the jack to the ground jack, in
case no microphone is present. Accessory attach/detach
events and headset button pushes are all debounced by
30 ms.
The accessory detect circuit can be enabled
independently from the microphone or audio bias by setting
the HSDETEN bit. When the audio bias and mic bias are both
off, only the connection or disconnection of an accessory can
be detected, not the specific type of accessory. In this mode,
it is assumed that the accessory is a stereo headphone and
the HPDET interrupt, which is sensitive to both edges,
reflects attach and detach events. The HPDET interrupt can
be masked by setting the MHPDET mask bit. Masking the
interrupt does not prevent the interrupt from appearing in the
interrupt registers, but prevents the PMICINT pin from
asserting a hardware interrupt.
When the audio bias and MIC2 bias are enabled, the
accessory detect circuit can distinguish between a stereo
headphone (low-impedance), a headset microphone
(medium-impedance), a headset button push (low-
impedance) and connect/disconnect events. For headset
button pushes, the circuit also distinguishes between
momentary button pushes of less than 2 seconds duration
and long button pushes of more than 2 seconds duration.
With audio bias and MIC2 bias enabled, connecting or
disconnecting a headphone will assert the HPDET interrupt.
Connecting a headset will assert the HSDET interrupt.
Pushing the headset button and releasing it within 2 seconds
will assert the SWMPINT (switch momentary push) interrupt
and pushing the button and releasing it after more than 2
seconds will assert the SWLPINT (switch long push)
interrupt. Each of these interrupts also has a corresponding
mask bit. Note that if a headphone was detected and was
later determined to be a headset, the HPDET interrupt will be
cleared and the HSDET interrupt will be set. This situation
can occur in two ways: (1) if the audio bias and MIC2 bias
were off when the headset was connected, it will be detected
as a headphone. If the biases are then turned on, the circuit
will recognize that the accessory is actually a headset and will
update the interrupts accordingly; (2) if the headset button
was being pushed while the headset was being plugged into
the jack, it will appear to be a low-impedance accessory and
will be detected as a headphone. When the button is finally
released, the circuit will recognize that the accessory is
actually a headset and will update the interrupts accordingly.
TRANSMIT INPUTS
The transmit inputs accept signals from a low level signal
electret microphone as well as high signal level MEMS based
microphones. In addition, it allows connecting a digital
microphone. Finally, it allows on chip routing from the stereo
line-in inputs.
The microphone input amplifiers are enabled by setting the
PSCNTMIC1 and PSCNTMIC2 bits. The right channel input
is selectable between a microphone connected to MC2IN
and the line input RXINR by setting the RAMPSEL bit. The
left channel input is selectable between a microphone
connected to MC1IN and the line input RXINL by setting the
LAMPSEL bit. Note that the input signals must be AC
coupled. When in voice mode, (PCM1) MC1IN or RXINL is
sent to the left and right channels by default, depending on
the PSCNTMIC1 and LAMPSEL bits. In order to send MC2IN
or RXINR to the left and right channels when in voice mode,
the MC1IN amplifier must be disabled by setting
PSCNTMIC1IN=0.
When in stereo mode, the audio signal from MC1IN,
RXINL, or digital microphone on the MC1IN pin, is sent
exclusively to the left channel of PCM2 data. When in stereo
mode, the audio signal from MC2IN, RXINR, or digital
microphone in MC2IN pin, is sent exclusively to the right
channel of PCM2 data, as shown in Figure 71 . When in voice
mode, the active transmit input signal is sent to the left and
right channels, except for the digital microphone on MC1IN,
which is not supported in voice mode.
The MC2IN input is amplified by the ATXR pre-amplifier
with course gain setting controlled with MIC2PRE[1:0]. The
input amplifiers can also be muted by setting the RAMPMUT
bit. The selected signal can be routed to the receive section
and it can be converted by the ADC right channel. The ADC
gain can be adjusted with the VCEPGATX[4:0] bits. Before
transmitting to the digital serial interface, the volume of the
digitized signal can be controlled with a fine gain setting
through RAMPVL[5:0].
The MC1IN input is amplified by the ATXL pre-amplifier
with course gain setting controlled with MIC1PRE[1:0]. The
input amplifiers can also be muted by setting the LAMPMUT
bit. The selected signal can be routed to the receive section
and it can be converted by the ADC left channel. The ADC
gain can be adjusted with the VCEPGATX[4:0] bits. Before
900841
Analog Integrated Circuit Device Data
142
Freescale Semiconductor
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