UM2448 Rev 6 43/49
UM2448 B-STLINK-ISOL board extension description
48
13.4 Jumper configuration
Jumpers on the B-STLINK-ISOL board (MB1599) are used to configure the return JTAG
clock path required for correct JTAG operations. The highest is the JTAG clock frequency,
the closest to the target must be the loopback.
1. Loopback is done at STLINK-V3SET main module (MB1441) level: MB1441 JP1 is ON,
while MB1599 JP2 is OFF.
2. Loopback is done at B-STLINK-ISOL board (MB1599) level: MB1441 JP1 is OFF (very
important to not potentially degrade the MB1599 board), while MB1599 JP1 and JP2
are ON.
3. Loopback is done at the target level: MB1441 JP1 OFF (very important to not
potentially degrade the MB1599 board), MB1599 JP1 is OFF and JP2 is ON. Loopback
is done externally between pin
6 and pin 9 of CN1.
Caution: Always ensure that either the JP1 jumper from the STLINK-V3SET main module (MB1441),
or the JP2 jumper from the B-STLINK-ISOL board (MB1599) is OFF, before stacking them.
13.5 Target voltage connection
The target voltage must always be provided to the board to work correctly (input for B-
STLINK-ISOL). It must be provided to pin 3 of the STDC14 connector (CN1), either directly
on MB1599 or through the MB1440 adapter board. In case of use with the MB1440 adapter
board, the target voltage can be provided either through pin
3 of CN1, pin 1 of CN2, pin 1 of
CN6, or pin
2 and pin 3 of JP10 of the MB1440 board. The expected range is 1,65 V to
3,3
V.
13.6 Board connectors
13.6.1 STDC14 (STM32 JTAG/SWD and VCP)
The STDC14 CN1 connector on the MB1599 board replicates the STDC14 CN1 connector
from the MB1441 main module. Refer to
Section 8.1.2 for details.
13.6.2 UART/I
2
C/CAN bridge connector
The UART/I2C/CAN bridge CN7 connector on the MB1599 board replicates the
UART/I2C/CAN bridge CN7 connector from the MB1440 board. Refer to
Section 8.2.7 for
details.
13.6.3 SPI/GPIO bridge connector
The SPI/GPIO bridge CN8 connector on the MB1599 board replicates the SPI/GPIO bridge
CN8 connector from the MB1440 board. Refer to
Section 8.2.8 for details.
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