AS3977 datasheet(32/47 Pages) AMSCO

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AS3977

Data Sheet - A p p l i c a t i o n I n f o r m a t i o n

K<15:11>

PREOP2

<4:0>

application dependent

Preamplifier power level setting 2

0 (00000): power off

0 (00001): minimum power

31 (11111): maximum power

L<0>

L<7:1>

FSK2

Modulation type selection 2

0: FSK

1: reserved for test purposes only

0000000

reserved Bits: set to Binary 0000000 for normal mode

of operation

Baud Rate Generator, Data Generator and Digital Test Multiplexer section

L<9:8>

MCCS

<1:0>

Micro controller clock output

0 (00): reserved

1 (01): reserved

2 (10): Micro controller clock is on during transmit

(MCCLK is output)

3 (11): Micro controller clock is always on (MCCLK is

output)

L<12:10>

MCCDS

<2:0>

application dependent

Clock output driver driving strength setting

0 (000): 4mA (maximum) driving strength

…

7 (111): 1mA (minimum) driving strength

L<14:13>

CLKS<1:0>

application dependent

MCCLK source selection

0 (00): MCCLK connected to pre scaler output

1 (01): MCCLK connected to baud rate generator

output

2 (10): MCCLK connected to baud rate generator

output but inverted

3 (11): not used

L<15>

PSC<2:0>

application dependent

Micro controller clock pre scaler division ratio

fOUT=2

-PSC<2:0>*f

M<1:0>

M<9:2>

TCV<7:0>

application dependent

Baud rate generator counter value

M<11:10>

ASC<1:0>

application dependent

Baud rate generator after scaler division ratio

fOUT=2

-ASC<1:0>*f

M<15:12>

reserved

0010

reserved Bits: set to Binary 0010 for normal mode of

operation

Temperature Sensor section

N<0>

TSON

0: Temperature sensor off

1: Temperature sensor on

N<1>

TSNRST

Reset of temperature sensor, active=low

N<7:2>

0000000

reserved Bits: set to Binary 0000000 for normal mode

of operation

Power Down Control (see Power On Reset on page 22)

N<8>

SETPD

Set power down, active=high (see Power On Reset on

page 22)

Table 23. Configuration Registers Description

Name

Default Value

Description

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