MAS3549F datasheet(60/92 Pages) MICRONAS

60 / 92 page

MAS 35x9F

DATA SHEET

June 30, 2004; 6251-505-1DS

Micronas

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 35x9F.

VDD, VSS

SUPPLY

Digital supply pins.

XVDD, XVSS

SUPPLY

Supply for digital output pins.

I2CVDD

SUPPLY

Supply for I2C interface circuitry. This net uses VSS or

XVSS as the ground return line.

PVDD

SUPPLY

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.

AVDD0/AVSS0

SUPPLY

Supply for analog output amplifier.

AVDD1/AVSS1

SUPPLY

Supply for internal analog circuits (A/D, D/A convert-

ers, clock, PLL, S/PDIF input).

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

SUPPLY

DC/DC converters switch ground. Connect using sep-

arate wide trace to negative pole of battery cell. Con-

nect also to AVSS0/1 and VSS/XVSS, VREF.

DCSO1/DCSO2

SUPPLY

DC/DC converter switch connection. If the respective

DC/DC converter is not used, this pin must be left

vacant.

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 to enable proper

function of the PUP-signals.

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.

PUP

OUT

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.

VBAT

Analog input for battery voltage supervision.

4.3.4. Oscillator Pins and Clocking

XTI

XTO

OUT

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,

Fig. 5–1 on page 89).

CLKO

OUT

The CLKO can drive an output clock line.

4.3.5. Control Lines

I2CC

SCL

IN/OUT

I2CD

SDA

IN/OUT

Standard I2C control lines.

DVS

I2C device address selector. Connect this pin either to

VDD (I2C device address: 3E/3Fhex) or VSS (I

device address: 3C/3Dhex) to select a proper I

device address (see also Table 3–2 on page 23).

4.3.6. Parallel Interface Lines

PI12..PI19

IN/OUT

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.

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