TMS320F28023DAS datasheet(83/130 Pages) TI

83 / 130 page

TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022

TMS320F28021, TMS320F28020, TMS320F280200

www.ti.com

SPRS523F – NOVEMBER 2008 – REVISED DECEMBER 2010

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

IDD CURRENT

MODULE(2)

REDUCTION (mA)

ADC

2(3)

I2C

ePWM

eCAP

SCI

SPI

COMP/DAC

HRPWM

CPU-TIMER

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

(IDDA) as well.

NOTE

IDDIO current consumption is reduced by 15 mA (typical) when XCLKOUT is turned off.

NOTE

The baseline IDD current (current when the core is executing a dummy loop with no

peripherals enabled) is 45 mA, typical. To arrive at the IDD current for a given application, the

current-drawn by the peripherals (enabled by that application) must be added to the baseline

IDD 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 VDD rail and 13 mA (typical) in the VDDIO rail.

•

Savings in IDDIO may be realized by disabling the pullups on pins that assume an output function.

Electrical Specifications

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