STA321 Datasheet, PDF (28/157 Pages) STMicroelectronics – 4-channel digital audio system with FFX™ driver

Power-up and power-down sequences
Figure 10. Hardware power-down sequence (full mode)
DC- Tdown
DC- Tup
STBY (active H)
DC Reg. PWDN
(active High)
DC Reg. A. OK
(active High)
Comp Cell PWDN
(active High)
EA is in Pwdn
EA Volume
Operational Volume
CB is in Pwdn
CB Volume
Operational Volume
PLL LOCKED
(active High)
PLL_PWDN
(active High)
I2C [CORE_CLK_ON]
CLK_I2C
I2C [CLK_PROC_ON]
CLK_PROC_CLK
I2C [CLK_FFX_ON]
CLK_FFX_CLK
I2C [CLK_ADC_ON]
CLK_ADC_CLK
I2C [CLK_SRC_ON]
CLK_SRC_CLK
E.A Fade Out
Bridge Fade Out
MUTE
O.V.
MUTE
O.V.
E.A Fade In
Bridge Fade In
PLL Locking Time
STA321
28/157
Doc ID 15351 Rev 3