AK4650 Datasheet, PDF (51/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

[AK4650]
■ Waking up AC-Link
1. AC-Link Power-down
The AK4650 controls the AC-link power-up/down by PR4 and PR5 bits. When PR4 bit is “1”, BITCLK and SDATAIN
go to “L”, but X’tal oscillator still operates. When PR5 bit is “1”, BITCLK and SDATAIN go to “L”, and X’tal oscillator
is powered-down. PLL power-up/down is controlled by VRA bit.
PR4 bit = “1”
PR5 bit = “1”
VRAbit = “0”
BITCLK/SDATAIN output
X’tal oscillator
Stop
Normal operation
Stop
Stop
Output
Normal operation
Table 43. AC-Link Power-down
PLL
Power Down
Power Down
Power Down
2. AC-Link Power-up
The AK4650 supports the AC-link power-up sequence using SDATAIN output in addition to COLD RESET and WARM
RESET. In this mode the operation is same as WARM RESET when the AK4650 receives the SYNC signal.
SYNC
Power Down
CODEC
Sleep State
Wake Event
New Audio
BITCLK
SDATAOUT
SDATAIN
Slot 12 TAG
WR
26H
Data
PR4
Slot 12 TAG
TAG Slot 1 Slot 2
TAG Slot 1 Slot 2
Figure 39. AC-Link Wake Up Function by SDATAIN
3. SDATAIN Output
SDATAIN pin goes to “H” when pen interrupt is enable, AC-link is powered-down and pen touch is detected. SDATAIN
pin goes to “L” after SYNC signal is changed to “L” regardless of the pen touch detection. The AK4650 operates same as
WARM RESET by receiving this SYNC signal.
MS0502-E-01
- 51 -
2007/04