PEF 20954 HT V1.1 Infineon Technologies, PEF 20954 HT V1.1 Datasheet - Page 101

• Manufacturer Part Number: PEF 20954 HT V1.1
• Description: IC ECHO CANCELLER DGTL TQFP144
• Manufacturer: Infineon Technologies

Specifications of PEF 20954 HT V1.1

• Function: Smart Integrated Digital Echo Canceller (SIDEC)
• Interface: PCM, Serial, UCC
• Number Of Circuits: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 350mA
• Power (watts): 900mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 144-LFQFP
• Includes: Double Talk Detection
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: PEF20954HTV1.1; SP000007505

The timer can be used by the processor, if the processor wants to do different operations
inbetween. The timer is counting downward. The timing decrement is 1 ms. The
accuracy of the timer is +0 ... 1 ms. The maximum value is 65535 ms.
TIM[15:8]
LTIM[7:0] (Addr. 3CH): Low-Byte for Timer, Reset value = 00H
TIM[7:0]
CONFSCU1[7:0] (Addr.: 12H): Configuration of speech control unit 1,
write protected, Reset value = 69H
BNADD [3:0]
Attenuation Measurement
ADAPTFAST[1:0] Fast count period for attenuation meters for total echo attenuation
ADAPTSLOW[1:0] Slow count period for attenuation meters for total echo attenuation
CONFSCU2[7:0] (Addr.: 13H): Configuration of speech control unit 2,
write protected, Reset value = 97H
Data Sheet
ADD[3]
THL[4]
TIM[7]
BYP
BN
ADD[2]
THL[3]
TIM[6]
BYP
BN
load value for the Timer (high byte)
load value for the Timer (low byte)
Safety distance for SO > background noise + BNADD comparison
"0000": +0 dB
"0010": 3 dB
"0100": 6 dB
"0110": 9 dB
"1000": 12 dB
"1010": 15 dB
"1100": 18 dB
"1110": 22.5 dB
and transhybrid loss
"00": 2 ms
and transhybrid loss
"00": 64 ms
ADD[1]
THL[2]
TIM[5]
BYP
BN
"01": 1 ms
"01": 32 ms
ADD[0]
THL[1]
TIM[4]
BYP
BN
101
FAST[1]
ADAPT
THL[0]
TIM[3]
BYP
"0001": 1.5 dB
"0011": 4.5 dB
"0101": 7.5 dB
"0111": 10.5 dB
"1001": 13.5 dB
"1011": 16.5 dB
"1101": 21 dB
"1111": 24 dB
"10": 500 s "11": 250 s
"10": 16 ms
FAST[0]
ADAPT
ADD[1]
TIM[2]
RE
"11": 8 ms
Register Description
SLOW[1]
ADAPT
ADD[0]
TIM[1]
RE
Rev. 2, 2004-07-28
PEB 20954
PEF 20954
DHHLEC
SLOW[0]
ADAPT
TIM[0]