Datasheet
TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022
TMS320F28021, TMS320F28020, TMS320F280200
SPRS523J –NOVEMBER 2008–REVISED OCTOBER 2013
www.ti.com
6.4.1 Reducing Current Consumption
The 2802x/280200 devices incorporate a method to reduce the device current consumption. Since each
peripheral unit has an individual clock-enable bit, significant reduction in current consumption can be
achieved by turning off the clock to any peripheral module that is not used in a given application.
Furthermore, any one of the three low-power modes could be taken advantage of to reduce the current
consumption even further. Table 6-4 indicates the typical reduction in current consumption achieved by
turning off the clocks.
Table 6-4. Typical Current Consumption by Various
Peripherals (at 60 MHz)
(1)
PERIPHERAL I
DD
CURRENT
MODULE
(2)
REDUCTION (mA)
ADC 2
(3)
I
2
C 3
ePWM 2
eCAP 2
SCI 2
SPI 2
COMP/DAC 1
HRPWM 3
CPU-TIMER 1
Internal zero-pin oscillator 0.5
(1) All peripheral clocks (except CPU Timer clocks) are disabled upon
reset. Writing to/reading from peripheral registers is possible only
after the peripheral clocks are turned on.
(2) For peripherals with multiple instances, the current quoted is per
module. For example, the 2 mA value quoted for ePWM is for one
ePWM module.
(3) This number represents the current drawn by the digital portion of
the ADC module. Turning off the clock to the ADC module results in
the elimination of the current drawn by the analog portion of the ADC
(I
DDA
) as well.
NOTE
I
DDIO
current consumption is reduced by 15 mA (typical) when XCLKOUT is turned off.
NOTE
The baseline I
DD
current (current when the core is executing a dummy loop with no
peripherals enabled) is 45 mA, typical. To arrive at the I
DD
current for a given application, the
current-drawn by the peripherals (enabled by that application) must be added to the baseline
I
DD
current.
Following are other methods to reduce power consumption further:
• The flash module may be powered down if code is run off SARAM. This results in a current reduction
of 18 mA (typical) in the V
DD
rail and 13 mA (typical) in the V
DDIO
rail.
• Savings in I
DDIO
may be realized by disabling the pullups on pins that assume an output function.
84 Electrical Specifications Copyright © 2008–2013, Texas Instruments Incorporated
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