Datasheet
TRST
TMS
TDI
TDO
TCK
V
DDIO
MCU
EMU0
EMU1
TRST
TMS
TDI
TDO
TCK
TCK_RET
13
14
2
1
3
7
11
9
6 inches or less
PD
GND
GND
GND
GND
GND
5
4
6
8
10
12
JTAG Header
V
DDIO
TMS320F28030, TMS320F28031, TMS320F28032
TMS320F28033, TMS320F28034, TMS320F28035
www.ti.com
SPRS584J –APRIL 2009–REVISED OCTOBER 2013
6.5 Thermal Design Considerations
Based on the end application design and operational profile, the I
DD
and I
DDIO
currents could vary.
Systems that exceed the recommended maximum power dissipation in the end product may require
additional thermal enhancements. Ambient temperature (T
A
) varies with the end application and product
design. The critical factor that affects reliability and functionality is T
J
, the junction temperature, not the
ambient temperature. Hence, care should be taken to keep T
J
within the specified limits. T
case
should be
measured to estimate the operating junction temperature T
J
. T
case
is normally measured at the center of
the package top-side surface. The thermal application reports IC Package Thermal Metrics (literature
number SPRA953) and Reliability Data for TMS320LF24xx and TMS320F28xx Devices (literature number
SPRA963) help to understand the thermal metrics and definitions.
6.6 Emulator Connection Without Signal Buffering for the MCU
Figure 6-4 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 emulation signals
must be buffered. If the distance is less than 6 inches, buffering is typically not needed. Figure 6-4 shows
the simpler, no-buffering situation. For the pullup/pulldown resistor values, see Section 2.2, Signal
Descriptions.
A. See Figure 4-17 for JTAG/GPIO multiplexing.
Figure 6-4. Emulator Connection Without Signal Buffering for the MCU
NOTE
The 2803x devices do not have EMU0/EMU1 pins. For designs that have a JTAG Header
on-board, the EMU0/EMU1 pins on the header must be tied to V
DDIO
through a 4.7-kΩ
(typical) resistor.
Copyright © 2009–2013, Texas Instruments Incorporated Electrical Specifications 111
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TMS320F28035