CRD-5378 Cirrus Logic Inc, CRD-5378 Datasheet - Page 24

• Manufacturer Part Number: CRD-5378
• Description: Audio Modules & Development Tools Ref Bd LP Sngl-Ch Decimation Filter
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-5378

• Description/function: Audio D/A
• Operating Supply Voltage: 3.3 V
• Product: Audio Modules
• Supply Current: 100 mA
• For Use With/related Products: CS3302A, CS5373A, CS5378
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Many connections to the C8051F320 microcontroller are inactive by default, but are provided for conve-
nience during custom reprogramming. Listed below are the default active connections to the microcon-
troller and how they are used.
2.3.2.1
The microcontroller SPI interface communicates with the CS5378 digital filter to write/read configuration
information and collect conversion data from the SPI port. Detailed information about interfacing to the
digital filter SPI port can be found in the CS5378 data sheet.
2.3.2.2
The microcontroller USB interface communicates with the PC evaluation software to receive configuration
commands and return collected conversion data. The USB interface uses the Silicon Laboratories API
and Windows drivers, which are available free from the internet (http://www.silabs.com).
2.3.2.3
By default, the C8051F320 microcontroller receives its reset signal from the internal power-on reset. This
reset signal can be used to output to the CS5378 digital filter.
2.3.2.4
By default, the C8051F320 microcontroller uses an internally generated 12 MHz clock for compatibility
with USB standards.
2.3.2.5
By default, the C8051F320 microcontroller sends the TIMEB signal to the digital filter for the first collected
sample of a data record. By default, 100 initial samples are skipped during data collection to ensure the
CS5378 digital filters are fully settled, and the timebreak signal is automatically set for the first ‘real’ col-
lected sample.
2.3.2.6
Through the PC evaluation software, the microcontroller default firmware can be automatically flashed to
the latest version without connecting an external programmer. To flash custom firmware, software tools
and an inexpensive hardware programmer that connects to the C2 Debug Interface on CRD5378 is avail-
able for purchase from Silicon Laboratories (DEBUGADPTR1-USB).
2.3.3
By default, CRD5378 communicates with the PC evaluation software through the microcontroller USB
port. Additional hardware is designed onto CRD5378 to use the microcontroller I
local telemetry, but it is provided for custom programming convenience only and is not directly supported
by the CRD5378 PC evaluation software or microcontroller firmware.
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RS-485 Telemetry
SPI Interface
USB Interface
Reset Source
Clock Source
Timebreak Signal
C2 Debug Interface
2
C port as a low-level
CRD5378
DS639RD2