Datasheet

PF0(CPU)
PF2(CPU)
SYSCLKOUT
ADCENCLK
AIO
MUX
ADC
Channels
ADC
Core
12-Bit
0-Wait
Result
Registers
ADCINT1
ADCINT9
ADCTRIG1
TINT0
PIE
CPUTIMER0
ADCTRIG2
TINT1
CPUTIMER1
ADCTRIG3
TINT2
CPUTIMER2
ADCTRIG4
XINT2SOC
XINT2
ADCTRIG5
SOCA 1
ePWM1
ADCTRIG6
SOCB1
ADCTRIG7
SOCA 2
ePWM2
ADCTRIG8
SOCB2
ADCTRIG9
SOCA 3
ePWM3
ADCTRIG10
SOCB3
ADCTRIG11
SOCA 4
ePWM4
ADCTRIG12
SOCB4
TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
www.ti.com SPRS523J –NOVEMBER 2008–REVISED OCTOBER 2013
Figure 4-2. ADC Connections
ADC Connections if the ADC is Not Used
It is recommended that the connections for the analog power pins be kept, even if the ADC is not used.
Following is a summary of how the ADC pins should be connected, if the ADC is not used in an
application:
• V
DDA
– Connect to V
DDIO
• V
SSA
– Connect to V
SS
• V
REFLO
– Connect to V
SS
• ADCINAn, ADCINBn, V
REFHI
– Connect to V
SSA
When the ADC module is used in an application, unused ADC input pins should be connected to analog
ground (V
SSA
).
NOTE: Unused ADCIN pins that are multiplexed with AIO function should not be directly connected to
analog ground. They should be grounded through a 1-kΩ resistor. This is to prevent an errant code from
configuring these pins as AIO outputs and driving grounded pins to a logic-high state.
When the ADC is not used, be sure that the clock to the ADC module is not turned on to realize power
savings.
Copyright © 2008–2013, Texas Instruments Incorporated Peripherals 51
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TMS320F28020 TMS320F280200