Datasheet
TMS320F28030, TMS320F28031, TMS320F28032
TMS320F28033, TMS320F28034, TMS320F28035
SPRS584J –APRIL 2009–REVISED OCTOBER 2013
www.ti.com
6.4.1 Reducing Current Consumption
The 2803x 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 6-2 indicates the typical reduction in current consumption achieved by turning off the clocks.
Table 6-2. 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
eQEP 2
SCI 2
SPI 2
COMP/DAC 1
HRPWM 3
HRCAP 3
CPU-TIMER 1
Internal zero-pin oscillator 0.5
CAN 2.5
LIN 1.5
CLA 20
(1) All peripheral clocks (except CPU Timer clock) 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 40 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.
108 Electrical Specifications Copyright © 2009–2013, Texas Instruments Incorporated
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