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2.11 Power Supply
The main power input, +12.0V DC, to the 56F827EVM is through a 2.1mm coax power
jack, P1. An optional +5.0V DC power supply input is available through a 2-pin terminal
block, TB1. A 1.2A power supply is provided with the 56F827EVM; however, less than
500mA is required by the EVM. The remaining current is available for user daughter card
applications when connected to the daughter card interface. The power regulation on the
56F827EVM provides +5.0V DC voltage regulation for the codec's analog circuits and to
the additional voltage regulation logic on the EVM. The additional voltage regulation
logic provides +2.5V DC voltage regulation for the hybrid controller's core and +3.3V DC
voltage regulation for the controller's I/O, memory, parallel JTAG interface and
supporting logic; refer to
a Power-On LED, referenced as LED7.
P1
+12.0V DC
TB1
+5.0V DC
GND
Figure 2-9. Schematic Diagram of the Power Supply
2.12 Stereo Codec
A 16-bit audio quality stereo codec, Crystal Semiconductor CS4218, is connected to the
56F827's SSI port to support audio, voice and signal analysis applications. The codec is
clocked with a 12.288MHz oscillator. This allows the codec to operate between a sample
frequency of 8kHz and 48kHz. The sample rate can be manually set by setting the
appropriate switch positions on dip switch S4. The sample rate selections possible using
this three-position dip switch are detailed in
levels, eliminating the need for voltage-level translation circuitry. Additionally, a set of
zero ohm resistors are provided on the EVM to allow a user to disconnect the on-board
codec from the SSI port and to connect his own codec to the SSI port; refer to
Figure
2-11. The on-board codec has analog signal conditioning logic, allowing direct
2-12
Freescale Semiconductor, Inc.
2-9. Power applied to the 56F827EVM is indicated with
Figure
+5.0V
Condition
Regulator
Regulator
Regulator
56F827 Evaluation Module Hardware User's Manual
For More Information On This Product,
Go to: www.freescale.com
Power
+5.0V DC
Analog
+3.3V DC
+3.3V
+2.5V
+2.5V DC
2-7. The codec supports +3.3V digital
Table
Codec
56F827
56F827EVM
Parts
56F827
Core
MOTOROLA
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