MSP4458 datasheet(44/85 Pages) MICRONAS

44 / 85 page

MSP 44x8G

PRELIMINARY DATA SHEET

Micronas

Pins 71, 72 XTAL_IN, XTAL_OUT – Crystal Input and

Output Pins (Fig. 4–12)

These pins are connected to an 18.432 MHz crystal

oscillator which is digitally tuned by integrated capaci-

tances. An external clock can be fed into XTAL_IN

(leave XTAL_OUT vacant in this case). The audio

clock output signal AUD_CL_OUT is derived from the

oscillator. External capacitors at each crystal pin to

ground (AVSS) are required. It should be verified by

layout, that no supply current for the digital circuitry is

flowing through the ground connection point.

Pin 73, TP – This pin enables factory test modes. For

normal operation, it must be left vacant.

Pin 74, AUD_CL_OUT – Audio Clock Output

(Fig. 4–12)

This is the 18.432 MHz main clock output.

Pins 75, 76, NC – Pins not connected.

Pins 77, 78, D_CTR_I/O_1/0 – Digital Control Input/

Output Pins (Fig. 4–11)

These pins serve as general purpose input/output

pins. Pin D_CTR_I/O_1 can be used as an interrupt

request pin to the controller.

Pin 79, ADR_SEL – I2C Bus Address Select

(Fig. 4–10)

By means of this pin, one of three device addresses for

the MSP can be selected. The pin can be connected to

ground (I2C device addresses 80/81hex), to +5 V sup-

ply (84/85hex), or left open (88/89hex).

Pin 80, STANDBYQ – Stand-by

In normal operation, this pin must be High. If the MSP

is switched off by first pulling STANDBYQ low and then

(after >1

µs delay) switching off the 5 V, but keeping

the 8-V power supply (‘Stand-by’-mode), the SCART

switches maintain their position and function.

Pin -, I2S_DA_IN2/3

−I2S data input (see Fig. 4–9).

This

connected

I2S_DA_IN2

and

I2S_DA_IN3. Not available for PQFP80-pin package.

* Application Note:

All ground pins should be connected to one low-resis-

tive ground plane.

All supply pins should be connected separately with

short and low-resistive lines to the power supply.

Decoupling capacitors from DVSUP to DVSS, AVSUP

to AVSS, and AHVSUP to AHVSS are recommended

as closely as possible to these pins. Decoupling of

DVSUP and DVSS is most important. We recommend

using more than one capacitor. By choosing different

values, the frequency range of active decoupling can

be extended. In our application boards we use: 220 pF,

470 pF, 1.5 nF, and 10

µF. The capacitor with the low-

est value should be placed nearest to the pins.

The ASG pins should be connected as closely as pos-

sible to the MSP ground. They are intended for leading

with the SCART signals as shield lines and should not

be connected to ground at the SCART-connector.

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