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参数资料
| 型号： | MAS3587F |
| 厂商： | Electronic Theatre Controls, Inc. |
| 元件分类： | 通用总线功能 |
| 英文描述： | MPEG Layer 3 Audio Encoder/Decoder |
| 中文描述： | MPEG层3音频编码器/解码器 |
| 文件页数： | 53/83页 |
| 文件大小： | 734K |
| 代理商： | MAS3587F |
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ADVANCE INFORMATION
MAS 3587F
Micronas
53
4.3. Pin Descriptions
4.3.1. Power Supply Pins
The use of all power supply pins is mandatory to
achieve correct function of the MAS 3587F.
VDD, VSS
Digital supply pins.
SUPPLY
XVDD, XVSS
Supply for digital output pins.
SUPPLY
I2CVDD
Supply for I
2
C interface circuitry. This net uses VSS or
XVSS as the ground return line.
SUPPLY
PVDD
Auxiliary pin for analog circuitry. This pin has to be
connected via a 3-nF capacitor to AVDD1. Extra care
should be taken to achieve a low inductance PCB line.
SUPPLY
AVDD0/AVSS0
Supply for analog output amplifier (output stage).
SUPPLY
AVDD1/AVSS1
Supply for internal analog circuits (A/D, D/A convert-
ers, clock, PLL, S/PDIF input).
SUPPLY
AVDD0/AVSS0 and AVDD1/AVSS1 should receive the
same supply voltages.
4.3.2. Analog Reference Pins
AGNDC
Internal analog reference voltage. This pin serves as
the internal ground connection for the analog circuitry.
VREF
Analog reference ground. All analog inputs and out-
puts should drive their return currents using separate
traces to a ground starpoint close to this pin. Connect
to AVSS1. This reference pin should be as noise free
as possible.
4.3.3. DC/DC Converters and Battery Voltage
Supervision
DCSG1/DCSG2
DC/DC converters switch ground. Connect using sepa-
rate wide trace to negative pole of battery cell. Con-
nect also to AVSS0/1 and VSS/XVSS.
SUPPLY
DCSO1/DCSO2
DC/DC converter switch connection. If the respective
DC/DC converter is not used, this pin must be left
vacant.
SUPPLY
VSENS1/VSENS2
Sense input and power output of DC/DC converters. If
the respective DC/DC converter is not used, this pin
should be connected to a supply.
IN
DCEN
Enable signal for both DC/DC converters. If none of
the DC/DC converters is used, this pin must be con-
nected to VSS.
IN
PUP
Power-up. This signal is set when the required volt-
ages are available at both DC/DC converter output
pins VSENS1 and VSENS2. The signal is cleared
when both voltages have dropped below the reset level
in the DCCF Register.
OUT
VBAT
Analog input for battery voltage supervision.
IN
4.3.4. Oscillator Pins and Clocking
XTI
XTO
The XTI pin is connected to the input of the internal
crystal oscillator, the XTO pin to its output. Each pin
should be directly connected to the crystal and to a
ground-connected capacitor (see application diagram).
IN
OUT
CLKO
The CLKO can drive an output clock line.
OUT
4.3.5. Control Lines
I2CC
I2CD
Standard I
2
C control lines.
SCL
SDA
IN/OUT
IN/OUT
DVS
I
2
C device address selector. Connect this pin either to
VDD (I
2
C device address: 3E/3F
hex
) or VSS (I
2
C
device address: 3C/3D
hex
) to select a proper I
2
C
device address (see also Table 3
–
1 on page 17).
IN
4.3.6. Parallel Interface Lines
PI12..PI19
The PIO input pins PI12..PI19 are used as 8-bit I/O
interface to a microcontroller in order to transfer com-
pressed and uncompressed data. PI12 is the LSB,
PI19 the MSB.
IN/OUT
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