TMS320F28069MPZPQ datasheet(32/204 Pages) TI2

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7.8 Thermal Design Considerations

Based on the end application design and operational profile, the IDD and IDDIO currents could vary. Systems

that exceed the recommended maximum power dissipation in the end product may require additional thermal

enhancements. Ambient temperature (TA) varies with the end application and product design. The critical factor

that affects reliability and functionality is TJ, the junction temperature, not the ambient temperature. Hence, care

should be taken to keep TJ within the specified limits. Tcase should be measured to estimate the operating

junction temperature TJ. Tcase is normally measured at the center of the package top-side surface. The thermal

application report Semiconductor and IC Package Thermal Metrics helps to understand the thermal metrics and

definitions.

7.9 Debug Probe Connection Without Signal Buffering for the MCU

Figure 7-3 shows the connection between the MCU and JTAG header for a single-processor configuration. If the

distance between the JTAG header and the MCU is greater than 6 inches, the debug signals must be buffered.

If the distance is less than 6 inches, buffering is typically not needed. Figure 7-3 shows the simpler, no-buffering

situation. For the pullup and pulldown resistor values, see Section 6.2.

TRST

TMS

TDI

TDO

TCK

DDIO

MCU

EMU0

EMU1

TRST

TMS

TDI

TDO

TCK

TCK_RET

6 inches or less

GND

JTAG Header

DDIO

See Figure 8-54 for JTAG/GPIO multiplexing.

Figure 7-3. Debug Probe Connection Without Signal Buffering for the MCU

Note

The 2806x devices do not have EMU0/EMU1 pins. For designs that have a JTAG Header onboard,

the EMU0/EMU1 pins on the header must be tied to VDDIO through a 4.7-kΩ (typical) resistor.

TMS320F28069, TMS320F28069M, TMS320F28069F, TMS320F28068M, TMS320F28068F

TMS320F28067, TMS320F28066, TMS320F28065, TMS320F28064, TMS320F28063

TMS320F28062, TMS320F28062F

SPRS698J – NOVEMBER 2010 – REVISED SEPTEMBER 2021

www.ti.com

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TMS320F28068F TMS320F28067 TMS320F28066 TMS320F28065 TMS320F28064 TMS320F28063

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TMS320F28069MPZPQ 数据表(PDF) 32 Page - Texas Instruments

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