SI3011-F-FSR Silicon Laboratories Inc, SI3011-F-FSR Datasheet - Page 19

• Manufacturer Part Number: SI3011-F-FSR
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3011-F-FSR

• Lead Free Status / RoHS Status: Supplier Unconfirmed

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.
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.
Component
LS1
C41
R41
Q6
AOUT
+5VA
Figure 18. AOUT PWM Circuit for Call Progress
Table 12. Component Values—AOUT PWM
Speaker BRT1209PF-06
0.1 µF, 16 V, X7R, ±20%
150 1/10 W, ±5%
NPN KSP13
Value
Rev. 1.11
R41
C41
Venkel, SMEC, Panasonic
Venkel, SMEC
Supplier
Fairchild
Intervox
Si3050 + Si3011
Q6
LS1
19