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CRD44130-FB Datasheet(PDF) 10 Page - Cirrus Logic |
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CRD44130-FB Datasheet(HTML) 10 Page - Cirrus Logic |
10 / 39 page 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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