TMS320F28030_16 Datasheet, PDF (24/160 Pages) Texas Instruments – Piccolo Microcontrollers

TMS320F28030, TMS320F28031, TMS320F28032
TMS320F28033, TMS320F28034, TMS320F28035
SPRS584K – APRIL 2009 – REVISED JUNE 2016
www.ti.com
5.4.1 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 5-2 indicates the typical reduction in current consumption achieved by turning off the clocks.
Table 5-2. Typical Current Consumption by Various
Peripherals (at 60 MHz)⁽¹⁾
PERIPHERAL
MODULE ⁽²⁾
ADC
I_DD CURRENT
REDUCTION (mA)
2 ⁽³⁾
I2C
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.
24
Specifications
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