SI270X-A-EVB Silicon Laboratories Inc, SI270X-A-EVB Datasheet - Page 20

• Manufacturer Part Number: SI270X-A-EVB
• Description: BOARD EVAL FOR SI270X-A
• Manufacturer: Silicon Laboratories Inc

Specifications of SI270X-A-EVB

• Board Type: Fully Populated
• Amplifier Type: Class D
• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Max Output Power X Channels @ Load: 5W x 2 @ 3 Ohm
• Voltage - Supply: 9V
• Utilized Ic / Part: SI270X-A
• Description/function: Audio Amplifiers
• Output Power: 5 W
• Product: Audio Modules
• For Use With/related Products: Si270x
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1929

Si2704/05/06/07-A10
4.2.2. Standby Mode
Standby Mode is a reduced power state where the register states are preserved and the 2-Wire interface is fully
operational, allowing for new parameters and configuration settings to be programmed even though the amplifier
output is powered down. This state has the shortest wake-up time relative to the other low power modes. If the
buffered reference clock output (CLKO) is enabled, the timing generation circuitry remains active.
Standby Mode is initiated by setting the STANDBY argument of the ACTIVATE command via the 2-Wire interface.
Standby Mode can also be initiated by setting the AAD argument of the ACTIVATE command, which additionally
enables the Audio Activity Detector. See "4.5.2. Audio Activity Detector" on page 24 for additional information
about this setting.
To avoid clicks and pops in the audio output, mute is first asserted before entering Standby Mode.
4.2.3. Sleep Mode
Sleep Mode is the lowest power consumption state in which the chip parameters and configurations are retained.
However, chip parameter and configuration settings cannot be programmed and the buffered reference clock
output (CLKO) is disabled in this mode. The time to activate the chip is shorter from the Sleep Mode than when
activating from the Power Down Mode.
Sleep mode is initiated by setting the SLEEP argument of the ACTIVATE command.
4.2.4. Power Down Mode and Reset
Asserting the RST pin low disables the analog and digital circuitry, resets the registers to their default settings, and
disables the 2-Wire bus. The RST pin should always be asserted low when power to the device is ramped up, and
released once the power supply voltages have stabilized.
After RST is released high, the chip comes up in Power Down Mode with the registers set to their default values.
The 2-Wire interface remains active but only responds to the POWER_UP command that puts the device into
20
Sleep
Mode
POWER_DOWN
[ SLEEP / STANDBY ]
ACTIVATE
Figure 14. Operating Modes
POWER_DOWN
RESET
Assert
Power Down
[ SLEEP / ACTIVE ]
Rev. 0.6
Standby
RESET
ACTIVATE
Mode
Mode
POWER_UP
Release
RESET
[ ACTIVE / STANDBY / AAD ]
ACTIVATE
POWER_DOWN
Active
Mode