AK4532_04 Datasheet, PDF (12/17 Pages) Asahi Kasei Microsystems – Internet/Network/General Purpose Multimedia Audio CODEC

ASAHI KASEI
4. Explanation of each sequence
4.1. Reset & Power down
Power Supply
PD pin
PD(register)
RST(register)
[AK4532]
Internal State
INIT1
INITA Normal PD INITA Normal INIT2 Normal PD+INIT2 INITA Normal
Write to register
External clock
MCLK,LRCK,SCLK
Inhibit(1)
Inhibit(2)
Inhibit(2
The clocks may be stopped.
• INIT1: Initializing all registers. The AK4532 exists in the power down state.
• INIT2: Initializing all registers except PD , RST registers.
• INITA: Initializing the analog section. Initializing period is 516/fs.
• PD:
Power down state. All analog outputs are floating.
In case of RST register = “0”, initializing all registers except PD , RST registers.
• Inhibit(1): Inhibits writing to all registers.
• Inhibit(2): Inhibits writing to all registers except for PD , RST registers.
• The AK4532 operates with the external clocks(MCLK, LRCK, SCLK) during initializing the
analog section.
Figure 1. Reset & Power Down Sequence
4.2. PD pin operation
“H”: Normal operation
“L”: Initializing mode 1(INIT1 in Figure 1)
• Initializing all registers.
• Inhibits writing to all registers.
• The initialization of the analog section starts at rising edge of PD pin.
• SDO pin stays “L” during the initializing periods of 516/fs.
• Going into power down state.
4.3. RST register operation
“1”: Normal operation
“0”: Initializing mode 2(INIT2 in Figure 1)
• Initializing all registers except PD , RST registers.
• Inhibits writing to all registers except PD , RST registers.
• RST register goes “1” when PD pin goes “L”.
• The analog section is not initialized.
4.4. PD register operation
“1”: Normal operation
“0”: Power down
• The contents of all registers are held.
• PD resister goes “1” when PD pin goes “L”.
• All analog outputs(LOUT, ROUT) go floating.
• The initialization of the analog section starts at the rising edge of PD resister.
• SDO pin stays “L” during the initializing period of 516/fs.
4.5. SDO output pin operation
0178-E-02
12
2004/12