WM8608 ETC-unknow, WM8608 Datasheet - Page 45

• Manufacturer Part Number: WM8608
• Description: The Wm8608 Comprises A High Performance Multi-channel Pwm Digital Power Amplifier Controller. Simply By Adding Appropriate Power Output Stages A Multi-channel Power Amplifier May Be Built. Six Identical Full Audio Bandwidth Channels, Plus A Reduced B
• Manufacturer: ETC-unknow

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STANDBY, OUTPUT DISABLE AND RESET MODES
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STANDBY
Setting the STDBY register bit selects a low power mode, and immediately configures the output to
produce an output defined in Table 47 (PWMCFG). All trace of the previous input samples is
removed, but all control register settings are preserved.
OUTPUT DISABLE (OPDIS) PIN AND REGISTER (OPDISR)
The OPDIS pin is provided to immediately shutdown the outputs, primarily for their protection. This is
useful for short-circuit or thermal protection. The OPDIS pin can be configured in 2 modes:
In synchronous mode if OPDIS is high for longer than 100ns the outputs will be disabled. They will be
enabled again at the end of a processing frame when OPDIS goes low for longer than 100ns.
In latched mode if OPDIS is high for longer than 100ns, the outputs will be disabled and will remain
off until OPDIS is reset via the control interface and the end of a processing frame is reached (Table
50).
The output disable register (OPDISR) also allows the PWM outputs to be disabled via a register
write. If OPDISR is set the PWM outputs will be disabled at the end of the next processing frame and
enabled if OPDISR is reset at the end of the next processing frame.
Table 49 Power Down
EXTERNAL APPLICATION POWER-DOWN (EAPDB) PIN
The state of the output pin EAPDB shows whether the device is disabled (i.e. OPDIS input pin active
or STDBY register set).
Table 50 EAPDB Pin
R29 (1Dh)
Power Down
REGISTER ADDRESS
Power Down
Application
Synchronous
Latched
External
EAPDB
(default)
STATE
1
0
BIT
0
1
2
OPDISR
STDBY
The device is operating
correctly
The outputs are disabled or
the WM8608 device is in
Standby (default) mode
LABEL
MENA
DESCRIPTION
DEFAULT
1
0
1
0 : Normal Mode
1: Standby Mode
Output disable register
0: Normal mode
1: PWM output disabled
0 : Synchronous
1: Latched, reset via Control I/F
Standby select:
OPDIS Mode
DESCRIPTION
PP Rev 1.5 March 2004
WM8608
45