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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. 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 pr5.0V DC regulation for the CAN interface and
additional regulators. The 56F8323EVM pr3.3V DC voltage regulation for the
processor, memory, D/A, ADC, parallel JTAG interface and supporting logic; refer to
. 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
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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