Resistors and Capacitors
R23-R38
ADC RC input filter resistors:
Series resistors which can be used to create an RC filter on the
ADC's input.
C29-C44
ADC RC input filter capacitors:
Optional capacitors, not populated by default, for the ADC input's
RC filters.
Switches
S1:A
Isolated emulation and UART communication enable switches:
S1:A Position 1 – JTAG Enable:
•
ON –
All signals between the XDS100v2 emulation logic and the MCU will be connected. This
setting is valid when the MCU is being debugged or programmed via the on-card XDS100v2
emulator.
•
OFF –
The XDS100v2 emulation logic will NOT be connected to the MCU. This setting is valid
when the device will boot from FLASH, boot from a peripheral directly, or when an external
JTAG emulator will be used.
S1:A Position 2 – ISO UART communication enable:
•
ON –
The C2000 MCU’s GPIO-28 (and pin 76 of the 180-pin controlCARD connector) will be
coupled to the FTDI’s USB-to-Serial adapter. This allows UART communication to a computer
via the FTDI chip. However, in this position, GPIO-28 will be forced high by the FTDI chip.
Functionality of pin 76 of the connector will be limited.
•
OFF –
The C2000 MCU will NOT be connected to the FTDI USB-to-Serial adapter. Pin 76 of the
180-pin controlCARD connector will be directly connected to GPIO-28.
S1
QEP and SPIB selection switch:
This switch allows GPIO24 and GPIO25 to be routed to one of
two locations on the HSEC connector.
S2
QEP and SPIB selection switch:
This switch allows GPIO26 and GPIO27 to be routed to one of
two locations on the HSEC connector.
S3
SPIA or external crystal selection switch:
This switch enables the use of SPIA or an external
crystal. This methodology was required to support the full range of TI's baseboards and is not
recommended in a production system. For full details, see
S4
Boot Mode Switch:
Controls the Boot Options of the F280025C device, see
. For a full
description, see the device-specific data sheet.
S5
Analog Configuration Switch:
S4 Position 1 (left switch) –
ADC channel A8/C11 HSEC pin selection
•
Upward position –
Channel A8/C11 goes to HSEC pin 34
•
Downward Position –
Channel A8/C11 goes to HSEC pin 30
Position 2 (right switch) -
ADC voltage reference selection.
•
Upward position –
Internal voltage reference
•
Downward Position –
External voltage reference
Note that additional software configuration is required to enable the ADC's internal or external
voltage reference.
Hardware References
SPRUIR3B – SEPTEMBER 2019 – REVISED JUNE 2022
TMS320F280025C controlCARD Information Guide
11
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