Connectors
3-5
Operation
3.3.2
J6: 3.3-V JTAG Port
This connector is used mainly during firmware development. It provides a fast
way to download firmware into the MCU, and also allows access to the MCU’s
hardware debugging features. If you have MSP430 software development
tools, you can use this port to write your own firmware for the ADS1254EVM.
This port is designed for use only with 3.3-V JTAG tools, such as those
provided by TI for use with the MSP430. If you attempt to use 5-V JTAG
tools with this port, you permanently damage the MSP430, as it is not 5-V
tolerant.
Table 3−3. J8: 3.3-V JTAG Port
Pin Num-
ber
Pin
Symbol
Signal Name
Direction
(at board)
Function
1
TDI/TDO
Test data in/out
Output
JTAG TDO port (see JTAG standard)
2
VCCTOOL
Power from JTAG
adapter
Power
JTAG adapter−provided power supply
(not used on ADS1254EVM)
3
TDI/VPP
Test data in/pro-
gramming voltage
Input
Used as a test data input, and for blowing
the security fuse
4
VCCLOCAL
Power sense
from board
Output
High rail from board; used for signal sense
when board is using its own power supply
during programming
5
TMS
Test mode select
Input
JTAG test mode select pin (see JTAG
standard)
6
NC
Not connected
−
Not used
7
TCK
Test clock
Input
JTAG serial clock input (see JTAG
standard)
8
NC
Not connected
−
Not used
9
GND
Ground
Power
Signal ground
10
NC
Not connected
−
Not used
11
RST/NMI
Reset/non-mask-
able interrupt
Input
MCU reset line
12
NC
Not connected
−
Not used
13
NC
Not connected
−
Not used
14
NC
Not connected
−
Not used
Содержание ADS1254
Страница 1: ... May 2002 Data Acquisition Products User s Guide SLAU083 ...
Страница 34: ...3 18 ...
Страница 36: ...Board Layouts 4 2 4 1 Board Layouts Figure 4 1 Board Layout Top Layer ...
Страница 37: ...Board Layouts 4 3 Physical Description Figure 4 2 Board Layout Bottom Layer ...
Страница 38: ...Schematics 4 4 4 2 Schematics The ADS1254 schematics are shown on the following pages ...