Datasheet
TMS320F28069, TMS320F28068, TMS320F28067, TMS320F28066
TMS320F28065, TMS320F28064, TMS320F28063, TMS320F28062
www.ti.com
SPRS698D –NOVEMBER 2010–REVISED DECEMBER 2012
5.6.1 Reducing Current Consumption
The 2806x 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 5-10 indicates the typical reduction in current consumption achieved by turning off the
clocks.
Table 5-10. Typical Current Consumption by Various
Peripherals (at 90 MHz)
(1)
PERIPHERAL I
DD
CURRENT
MODULE
(2)
REDUCTION (mA)
ADC 2
(3)
I2C 3
ePWM 2
eCAP 2
eQEP 2
SCI 2
SPI 2
COMP/DAC 1
HRPWM 3
HRCAP 3
USB 12
CPU-TIMER 1
Internal zero-pin oscillator 0.5
CAN 2.5
CLA 20
McBSP 6
(1) All peripheral clocks (except CPU Timer clock) are disabled upon
reset. Writing to or 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.
Copyright © 2010–2012, Texas Instruments Incorporated Peripheral and Electrical Specifications 71
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