MAS3504D datasheet(16/40 Pages) MICRONAS

16 / 40 page

MAS 3504D

Micronas

3.4. Version Number

Table 3–5 shows where the chip identification and the

name of the software is located.

3.5. Register Table

In Table 3–6, the internal registers for controlling the

MAS 3504D are listed. They are accessible by ‘regis-

ter read/write’ I2C commands (see Section 3.3. on

page 14). For a more detailed register usage (see

Table 3–8 on page 19).

Important note! Writing into undocumented registers

or read-only registers is always possible, but it is highly

recommended not to do so. It may damage the func-

tion of the firmware and may even lead to a complete

system crash of the decoder operation which can only

be restored by a reset.

3.5.1. DC/DC Converter (Reg. 8Ehex)

The DCCF Register controls both, the internal voltage

monitor and the DC/DC converter. Between output

voltage of the DC/DC converter and the internal volt-

age monitor threshold an offset exists which is shown

in Table 3–8 on page 19. Please pay attention to the

fact, that I2C protocol is working only if the processor

works (WSEN = 1).However, the setting for the DCCF

are deasserted.

The DC/DC converter may generate interference noise

that could be unacceptable for some applications.

Thus the oscillator frequency may be adjusted in 32

steps in order to allow the system controller to select a

base frequency that does not interfere with an other

application.

The CLKI input provides the base clock fCLKI for the

frequency divider whose output is made symmetrical

with an additional divider by two. The divider quotient

is determined by the content of the DCCF register.

This register allows 32 settings generating a DC/DC

converter clock frequency fdc between:

(EQ 1)

3.5.2. User Control (Reg. FDhex)

The UserControl register is used to switch between

basic operation modes. On startup, after a software

reset or a “run 1” command it is set to 0hex. The

MAS 3504D sets the control registers to default val-

ues, switches off all interfaces (except I2C) and waits

for a change in UserControl.

Table 3–5: MAS 3504D Version

Addr.

[hex]

Content

Example Value

D1:FF6

name of

MAS 3504D

version

0x03504

3504

D1:FF9

description:

“G.729a CODEC”

0x0472e

D1:FFA

0x03732

D1:FFB

0x03961

D1:FFC

0x02043

D1:FFD

0x04f44

D1:FFE

0x04543

D1:FFF

0x02020

CLKI

()

⋅

-------------------------

015

} m

32 16

}

∈

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