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CRD44130-FB Datasheet(PDF) 10 Page - Cirrus Logic

Part # CRD44130-FB
Description  20 W x 2 40 W x 1 PWM Amplifier Reference Design
Download  39 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CRD44130-FB Datasheet(HTML) 10 Page - Cirrus Logic

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10
DS690RD2
CRD44130-FB
2.2
Hardware Board Control
The CRD44130-FB provides labeled push-buttons to control mute, Left/Right Channel enable/disable, LFE
enable/disable, 2.1 enable/disable, 0 dB gain, and a variable volume control knob. LED’s provide user feed-
back for current board settings.
Volume is controlled by either R35 or J4. If a shunt is placed on J4, the CS44600 master volume register
will be forced to 0 dB and volume control R35 will have no effect. If the shunt is removed from J4, R35 will
control the CS44600 master volume register, which can be varied from -127 dB to +24 dB in 1 dB incre-
ments.
See Table 1 on page 10 for push-button descriptions
.
2.3
Board Error Handling
2.3.1
Software Mode
If an error condition occurs while the board is operating in Software Mode, the interrupts will not be ser-
viced by the micro-controller as they are in Stand-Alone Mode. If a thermal warning event occurs, it will
be ignored, and the board will continue to work as specified by the GUI controls. An over-current, under-
voltage, or thermal error condition will cause the CS44130 devices to reset themselves in an attempt to
clear the error. If the devices cannot clear the error within a fixed amount of time (approximately 0.5 sec-
onds), they will shut off permanently and will require the user to toggle their reset signals via the power
stage enable check-boxes on the GUI. Clicking on the “Display Error” push-button on the GUI allows the
user to determine which of the error conditions, if any, is present at any given time.
2.3.2
Stand-Alone Mode
The CS44130 provides signals indicating thermal warning, thermal error, over-current, and under-voltage.
A thermal warning will cause the CS44600 to attenuate the audio signal in an attempt to remove the ther-
mal warning condition, after which it will gradually restore the volume to the original setting. An over-cur-
rent, under-voltage, or thermal error condition will cause the CS44130 devices to reset themselves in an
attempt to clear the error. If the devices cannot clear the error within a fixed amount of time (approximately
0.5 seconds), they will shut off permanently and will require the user to toggle their reset signals through
push-buttons S3 and S4.
Push-Button LED
Label
Description
LED On
LED Off
S1
D14 2.1 Enable/Disable
J1 speaker outputs provide midrange
and high-frequency Left and Right chan-
nel audio content. J2 provides mono,
low-frequency audio content (see
Figure 14 for filter response).
J1 speaker outputs provide full-range Left
and Right channel audio content. J2 pro-
vides full-range, Left channel audio con-
tent.
S2
D13
Mute/Unmute
All speaker outputs are muted. PWM
outputs are 50% duty cycle.
Speaker outputs are not muted.
S3
D16
L/R On/Off
CS44130 power stage U1 is enabled.
CS44130 power stage U1 is held in reset.
Left and right channels on J1 will not out-
put audio.
S4
D19
LFE On/Off
CS44130 power stage U2 is enabled.
CS44130 power stage U2 is held in reset.
Subwoofer channel on J2 will not output
audio.
Table 1. Push-Button Descriptions


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