TMP320C2811PBKA datasheet(87/147 Pages) TI

87 / 147 page

Electrical Specifications

June 2004

SPRS257

6.5

Current Consumption Graphs

0 5

105

120

135

150

SYSCLOCKOUT (MHz)

120

150

180

210

240

IDD

IDDIO

IDDA

Total

Figure 6−1. R2812/R2811 Typical Current Consumption (With Peripheral Clocks Enabled)

6.6

Reducing Current Consumption

28x DSPs incorporate a unique method to reduce the device current consumption. A reduction in current

consumption can be achieved by turning off the clock to any peripheral module which is not used in a given

application. Table 6−1 indicates the typical reduction in current consumption achieved by turning off the clocks

to various peripherals.

Table 6−1. Typical Current Consumption by Various Peripherals (at 150 MHz)†

PERIPHERAL MODULE

IDD CURRENT REDUCTION (mA)

eCAN

EVA

EVB

ADC

8‡

SCI

SPI

McBSP

† All peripheral clocks are disabled upon reset. Writing to/reading from peripheral registers is possible only after the peripheral clocks

are turned on.

‡ 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 (ICCA) as well.

6.7

Power Sequencing Requirements

Power sequencing is not required on the R281x devices. In other words, 3.3-V and 1.8-V (or 1.9-V) can ramp

together. R281x can also be used on boards that have F281x power sequencing implemented; however, if

the 1.8-V (or 1.9-V) rail lags the 3.3-V rail, the GPIO pins are undefined until the 1.8-V rail reaches at least

1 V.

TMP320C2811PBKA 데이터시트(PDF) 87 Page - Texas Instruments

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