zl50235 Zarlink Semiconductor, zl50235 Datasheet - Page 21

• Manufacturer Part Number: zl50235
• Description: 16 Channel Voice Echo Canceller
• Manufacturer: Zarlink Semiconductor

7.5
Each group of echo cancellers can be placed in Power Down mode by writing a “0” into the PWUP bit in their
respective Main Control Register. When a given group is in Power Down mode, the corresponding PCM data are
bypassed from Rin to Rout and from Sin to Sout with two frames delay. Refer to the Main Control Register section
for description.
The typical power consumption can be calculated with the following equation:
where 0 ≤ Nb_of_groups ≤ 8.
Power Management
Figure 11 - Power Up Sequence Flow Diagram
Delay 1000 ns
Reset High
Reset Low
P
C
Hardware
= 9 * Nb_of_groups + 3.6, in mW
Zarlink Semiconductor Inc.
System Powerup
Reset Held Low
ZL50235
MCLK Active
ECAN Ready
Delay 500 µs
Delay 100 µs
Delay 500 µs
Reset High
Reg. Reset
21
Software
Delay 250 µs
PWUP to “1”
PWUP to “0”
Data Sheet