REV. M

Page 17

September 1998

AS3502

V1

D7

D6

D5

D4

D3

D2

D1

D0

Name

0

V14

V13

V12

V11

V10

F19

F18

Default

X

X

X

X

X

X

X

X

Bit No

Symbol

Name and Description

D6-D2

V14-V10

A 5 bit coefficient (X) written into this register allows to programme both the tone ringer

attenuation in pulse density mode and the attenuation of the tone generator in square

wave mode. The coefficient in decimal format for a given attenuation can be calculated

as:

X

= 31*10^(

Volume(dB )

20

);X= ( 1…31)

VOUT

= 2 *VDD *10^(

V 1

20

) (V)

In tone generator square wave mode a 4-bit coefficient using bits V13 to V10 allows to

programme the volume where coefficient in decimal format for a given volume can be

calculated as:

X

= 16 *10^(

Volume(dB )

20

);X= (0…15)

In receive direction the absolute output value on the speaker and earpiece outputs

depends on AGR and V2.

VOUTEP= 6.14 dBm + V2C + V1 + AGR (dBm)

VOUTSP=6.14 dBm + V2 + V1 + 3 dB (dBm)

In transmit direction the output value depends on V1 and DGX.

VOUT = 6.14 dBm0 + V1 + DGX (dBm0)

F19-F18

These bits are the two most significant bits of the 10-bit frequency coefficient.

12) FREQUENCY CONTROL REGISTER 2

This register contains eight bits of the 10-bit coefficient of the second frequency.

F2

D7

D6

D5

D4

D3

D2

D1

D0

Name

F27

F26

F25

F24

F23

F22

F21

F20

Default

X

X

X

X

X

X

X

X

Bit No

Symbol

Name and Description

D7-D0

F27-F20

A 10-bit coefficient (X) written into this register and into bits D0 and D1 of V2 allows to

programme the second frequency from 3.9 Hz to 3996 Hz. The coefficient in decimal

format for a given frequency can be calculated as:

X

=

f (Hz )* 256

1000