MAS3504D datasheet(25/40 Pages) MICRONAS

25 / 40 page

MAS 3504D

Micronas

4.2.1. Pin Descriptions

4.2.1.1. Power Supply Pins

Connection of all power supply pins is mandatory for

the function of the MAS 3504D.

VDD

SUPPLY

VSS

SUPPLY

The VDD/VSS pair is internally connected with all digi-

tal modules of the MAS 3504D.

XVDD

SUPPLY

XVSS

SUPPLY

The XVDD/XVSS pins are internally connected with

the pin output buffers.

AVDD

SUPPLY

AVSS

SUPPLY

The AVDD/AVSS pair is connected internally with the

analog blocks of the MAS 3504D, i.e. clock synthe-

sizer and supply voltage supervision circuits.

4.2.1.2. DC/DC Converter Pins

DCEN

The DCEN input signal enables the DC/DC converter

operation.

DCSG

SUPPLY

The ‘DC converter Signal Ground’ pin is used as a

basepoint for the internal switching transistor of the

DC/DC converter. It must always be connected to

ground.

DCSO

OUT

DCSO is an open drain output and should be con-

nected with external circuitry (inductor/diode) to start

the DC/DC converter. When the DC/DC converter is

not used, it has to be connected to VSS.

VSENS

The VSENS pin is the input for the DC/DC converter

feedback loop. It must be connected directly with the

Schottky diode and the capacitor as shown in Fig. 2–1

on page 7.

When the DC/DC converter is not used, it has to be

connected to VDD.

4.2.1.3. Control Lines

I2CC

SCL

IN/OUT

I2CD

SDA

IN/OUT

Standard I2C control lines. Normally there are Pull-up-

resistors tied from each line to VDD.

4.2.1.4. Parallel Interface Lines

4.2.1.4.1. PIO Handshake Lines

’PIO handshake lines’ are used in operation mode.

PIO-DMA mode is used in input mode and

µP mode in

output mode.

PCS

The ’PIO chip select’ is driven from microcontroller to

activate data output from MAS 3504D to the bus. Data

is output to the bus on the falling edge of PCS and is

removed on the rising edge of PCS.

The ’PIO request’ must be set to ‘1’ to validate data

output from MAS 3504D.

RTR

OUT

‘Ready to read’ is driven from the MAS 3504D in PIO/

DMA input mode.

RTW

OUT

‘Ready to write’ is driven from MAS 3504D to indicate

that data is available in PIO output mode.

EOD

OUT

‘End of DMA’ is supported by the built-in firmware in

PIO-DMA input mode.

4.2.1.4.2. PIO Data Lines

PI19...PI12

PARALLEL DATA

OUT/IN

These pins are used to send or receive compressed

data.

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