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ZHCSA13P November 2008 – February 2021 TMS320F28020 , TMS320F280200 , TMS320F28021 , TMS320F28022 , TMS320F28023 , TMS320F28023-Q1 , TMS320F28026 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027 , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1

PRODUCTION DATA

封装选项

机械数据 (封装 | 引脚)

PT|48
- MTQF003C
DA|38
- MPDS502

散热焊盘机械数据 (封装 | 引脚)

DA|38
- QFND327

订购信息

8.5.4 Reducing Current Consumption

The 2802x/280200 devices incorporate a method to reduce the device current consumption. Because 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 8-1 indicates the typical reduction in current consumption achieved by turning off the clocks.

Table 8-1 Typical Current Consumption by Various Peripherals (at 60 MHz)

PERIPHERAL MODULE⁽¹⁾⁽³⁾	I_DD CURRENT REDUCTION (mA)
ADC	2⁽²⁾
I2C	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) 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.

(3) 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.

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.
To realize the lowest V_DDA current consumption in a low-power mode, see the respective analog chapter of the TMS320F2802x,TMS320F2802xx Technical Reference Manual to ensure each module is powered down as well.