TMS320F2811 datasheet(97/173 Pages) TI

97 / 173 page

Electrical Specifications

April 2001 − Revised July 2007

SPRS174O

6.7

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 (IDDA) as well.

6.8

Emulator Connection Without Signal Buffering for the DSP

Figure 6−3 shows the connection between the DSP and JTAG header for a single-processor configuration.

If the distance between the JTAG header and the DSP is greater than 6 inches, the emulation signals must

be buffered. If the distance is less than 6 inches, buffering is typically not needed. Figure 6−3 shows the

simpler, no-buffering situation. For the pullup/pulldown resistor values, see the pin description section.

TMS320F2811 数据表(PDF) 97 Page - Texas Instruments