SI3050-E-KT View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3050-E-KT

GLOBAL VOICE DAA

Silicon Laboratories 

Si3050 + Si3018/19

4. AOUT PWM Output

Figure 18 illustrates an optional circuit to support the pulse width modulation (PWM) output capability of the Si3050

for call progress monitoring purposes.To enable this mode, the INTE bit (Register 2) should be set to 0, the PWME

bit (Register 1) set to 1, and the PWMM bits (Register 2) set to 00.

+5VA

LS1

AOUT

R41

Q6

C41

Figure 18. AOUT PWM Circuit for Call Progress

Table 12. Component Values—AOUT PWM

Component

LS1

Q6

C41

R41

Value

Speaker BRT1209PF-06

NPN KSP13

0.1 µF, 16 V, X7R, ±20%

150 1/10 W, ±5%

Supplier

Intervox

Fairchild

Venkel, SMEC

Venkel, SMEC, Panasonic

Registers 20 and 21 allow the receive and transmit paths to be attenuated linearly. When these registers are set to

all 0s, the transmit and receive paths are muted. These registers affect the call progress output only and do not

affect transmit and receive operations on the telephone line.

The PWMM[1:0] bits (Register 1, bits 5:4) select one of three different PWM output modes for the AOUT signal,

including a delta-sigma data stream, a 32 kHz return to 0 PWM output, and a balanced 32 kHz PWM output.

Rev. 1.31

19

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