Power Supply
MOTOROLA Technical Summary 2-11
2.7 Reset
Logic is provided on the 56F8323 to generate an internal Power-On RESET. Additional
reset logic is provided to support the RESET signals from the JTAG connector, the
Parallel JTAG Interface and the user RESET push-button, S1; refer to Figure 2-6.
Figure 2-6. Schematic Diagram of the RESET Interface
2.8 Power Supply
The main power input to the 56F8323EVM, +12V DC at 1.2A, is through a 2.1mm coax
power jack. This input power is rectified to provide a DC supply input. This allows a user
the option to use a +12V AC power supply. A 1.2Amp power supply is provided with the
56F8323EVM; however, less than 500mA is required by the EVM. The remaining current
is available for custom control applications when connected to the Daughter Card
connectors. The 56F8323EVM provides +5.0V DC regulation for the CAN interface and
additional regulators. The 56F8323EVM provides +3.3V DC voltage regulation for the
processor, memory, D/A, ADC, parallel JTAG interface and supporting logic; refer to
Figure 2-7. Additional voltage regulation logic provides a low noise +3.0V DC voltage
reference to the controller’s A/D V
REFH
. Optionally, the processor’s A/D V
REFH
voltage
can be provided by the +3.3VA supply on the board by removing U15 and adding a 10
ohm resistor at R83. A jumper, JG11, and resistor, R68, are provided to allow the analog
and digital grounds to be isolated on the 56F8323EVM board. This allows the analog
ground reference point to be provided on a custom board attached to the 56F8323EVM’s
Daughter Card connectors. By removing R68, the AGND reference is disconnected from
the 56F8323EVM’s digital ground. By placing a jumper in JG11 or by reinstalling R68,
the AGND is reconnected to the 56F8323EVM’s digital ground. Power applied to the
56F8323EVM is indicated with a Power-On LED, referenced as LED13. Optionally, the
user can provide the +2.5 DC voltage needed by the controller’s core on connector J14 and
disable the on-chip CORE voltage regulator by removing the jumper on JG12.
RESET
PUSHBUTTON
MANUAL RESET
JTAG_TAP_RESET
JTAG_RESET
RESET
TRST
S1
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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