ST5088FN datasheet(19/33 Pages) STMICROELECTRONICS

19 / 33 page

Microwire access to B channel on receive

path

Bit MR (4) selects access from MICROWIRE

set high, data written to register CR2 is decoded

each frame, sent to the receive path and data in-

put at DR is ignored.

In the other direction, current PCM data input re-

ceived at DR can be read from register CR2 each

frame.

Microwire access to B channel on transmit

path

Bit MX (3) selects access from MICROWIRE write

only Register CR3 to DX output. When bit MX is

set high, data written to CR3 is output at DX every

frame and the output of PCM encoder is ignored.

B channel selection

Bit ’EN’ (2) enables or disables voice data trans-

fer on DX and DR pins. When disabled, PCM data

from DR is not decoded and PCM time-slots are

high impedance on DX.

In GCI mode, bits ’T1’ (1) and ’T0’ (0) select one

of the four channels of the GCI interface.

In COMBO I/II mode, only B1 or B2 channel can

be selected according to the interface format se-

lected. Bit ’T1’ is ignored.

CONTROL REGISTER CR2

Data sent to receive path or data received from

DR input. Refer to bit MR(4) in ”Control Register

CR1” paragraph.

CONTROL REGISTER CR3

DX data transmitted. Refer to bit MX(3) in ”Control

Rgister CR1” paragraph.

CONTROL REGISTER CR4

First byte of a READ or a WRITE instruction to

Control Register CR4 is as shown in TABLE 1.

Second byte is as shown in TABLE 6.

Transmit Input Selection

MIC1 or MIC2 source is selected with bit VS (7).

Transmit input selected can be enabled or muted

with bit TE (6).

Transmit gain can be adjusted within a 15 dB

range in 1 dB step with Register CR5.

Sidetone select

Bit ”SI” (5) enables or disables Sidetone circuitry.

When enabled, sidetone gain can be adjusted

with Register (CR5). When Transmit path is dis-

abled, bit TE set low, sidetone circuit is also dis-

abled.

External Auxiliary signal select

Bit ”EE” (4) set to one connects EAIN input to the

loudspeaker amplifier input.

Ring/Tone signal routing

Bits ”RTL” (3) and RTE (2) provide select capabil-

ity to connect on-chip Ring/Tone generator either

to loudspeaker amplifier input or to earpiece am-

plifier input or both.

PCM receive data routing

Bits ”SL” (1) and ”SE” (0) provide select capability

to connect received speech signal either to Loud-

speaker amplifier input or to earpiece amplifier in-

put or both.

CONTROL REGISTER CR5

First byte of a READ or a WRITE instuction to

Control Register CR5 is as shown in TABLE 1.

Second byte is as shown in TABLE 7.

Transmit gain selection

Transmit amplifier can be programmed for a gain

from 0dB to 15dB in 1dB step with bits 4 to 7.

0 dBmO level at the output of the transmit ampli-

fier (A reference point) is 0.739 Vrms (overload

voltage is 1.06 Vrms).

Sidetone attenuation selection

Transmit signal picked up after the switched ca-

pacitor low pass filter may be fed back into the

Receive Earpiece amplifier.

Attenuation of the signal at the out pu t of th e

sidetone attenuator can be programmed from

–8dB to –23dB relative to reference point A in

1 dB step with bits 0 to 3.

CONTROL REGISTER CR6

First byte of a READ or a WRITE instruction to

Control Register CR6 is as shown in TABLE 1.

Second byte is as shown in TABLE 8.

Earpiece amplifier gain selection:

Earpiece Receive gain can be programmed in 1

dB step from 0 dB to -15 dB relative to the maxi-

mum with bits 4 to 7.

0 dBmO voltage at the output of the amplifier on

pins VFr+ and VFr- is then 824.5 mVrms when

0dB gain is selected down to 146.6 mVrms

when –15 dB gain is selected.

Loudspeaker amplifier gain selection:

Loudspeaker Receive amplifier gain can be pro-

grammed in 2 dB step from 0 dB to -30 dB rela-

tive to the maximum with bits 0 to 3.

0 dBmO voltage on the output of the amplifier on

pins LS+ and LS- on 50

Ω is then 1.384 Vrms

(3.91Vpp) when 0 dB gain is selected down to

43.7 mVrms (123.6mVpp) when -30 dB gain is se-

lected.

ST5088

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