Cirrus Logic CK4970x4 - Manual (Page 14)

1-7 Copyright 2012 Cirrus Logic, Inc. DS898CK7
CK49x System Description
CK49x User’s Manual
1.3.2.7 I
2
S Digital Output (DAO Mux Output)
I 2 S digital output has the following characteristics:
• Connector Type: 0.100” Male Header
• Maximum Signal Level: +3.3V
• Reference Designator: P16
1.3.3 DC Power Input
The DC power input has the following characteristics and is switched by S7:
• Voltage Range: +9V
DC TO
+12V
DC
• Minimum Power: 18W supply (2A @ 9V)
• Connector Type: 2mm Female, positive center pin
• Reference Designator: J25
1.3.4 USB Connector
The control header has the following characteristics:
• Connector Type: USB Standard B Connector
• Reference Designator: J2
This connector is the interface between the CK49x and the PC.
1.3.5 MCU Programming Header
This header is used to program the MCU from a Silicon Labs programming dongle. This is not for
customer use, and should be used only by Cirrus FAEs for upgrading the board.
• Connector Type: 0.100” Shrouded Male Header
• Reference Designator: J9
1.3.6 Reset button
The button S6 (located near the USB connector J2) is used to reset the MCU. In stand-alone mode this
will re-initialize the entire board and start the stand-alone program over from the beginning.
In USB-control mode, this button will re-initialize the board and force the device to re-enumerate itself on
the PC USB interface.
1.3.7 Buttons and Knobs
The buttons S1 - S4 (located near the LCD) are used for controlling the MCU when in stand-alone mode.
The knob S5 is also used for controlling the MCU when in stand-alone mode.
1.3.8 DAO MUX Select Header
The DAO outputs of the DSP are sent to a mux that drives I 2 S Digital Output header P16. The signals
driven to P16 are selected by the Header P17. Only 1 shunt may be installed on header P17 at any time.
Using more than 1 shunt will cause multiple buffers to drive their outputs simultaneously and cause
contention.