CS44800 datasheet(52/80 Pages) CIRRUS

52 / 80 page

DS632F1

CS44800

7.3.5

Power Down Output Mode (PDN_OUTPUT_MODE)

Default = 0

0 - PWM Outputs are driven low during power down

1 - PWM Outputs are driven to the inactive state during power down

Function:

This bit is used to select the power-down state of the PWM output signals. When set to 0, each channel

which has been powered down, following the ramp-down cycle if enabled, will drive the output signals,

PWMOUTxx+ and PWMOUTxx-, low.

When set to 1, each channel which has been powered down, following the ramp-down cycle if enabled,

will drive the output signals to the inactive state. PWMOUTxx+ is driven low and PWMOUTxx- is driven

high.

7.3.6

Power Down (PDN)

Default = 1

0 - Normal Operation

1 - Power down

Function:

The entire device will enter a low-power state when this function is enabled, and the contents of the control

registers are retained in this mode. The power-down bit defaults to ‘enabled’ on power-up and must be

disabled before normal operation can occur.

7.4

PWM Channel Power Down Control (address 03h)

7.4.1

Power Down PWM Channels (PDN_PWMB4:PDN_PWMA1)

Default = 11111111

0 - Normal Operation

1 - Power down PWM channel

Function:

The specific PWM channel is in the power-down state. All processing is halted for the specific channel,

but does not alter the setup or delay register values. The PWM output signals are driven to the appropriate

logic level as defined by the Power-Down Output Mode bit, PDN_OUTPUT_MODE. When set to normal

operation, the specific channel will power up according to the state of the RAMP[1:0] bits and the channel

output configuration selected. When transitioning from normal operation to power down, the specific chan-

nel will power down according to the state of the RAMP[1:0] bits and the channel output configuration se-

lected. Ramp control is found in “Ramp Configuration (address 05h)” on page 54.

PDN_PWMB4

PDN_PWMA4

PDN_PWMB3

PDN_PWMA3

PDN_PWMB2

PDN_PWMA2

PDN_PWMB1

PDN_PWMA1

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