UM2448 Rev 6 21/49
UM2448 STLINK-V3SET functional description
48
Bridge SPI
SPI signals are available on MB1440 CN8 and CN9. To reach high SPI frequency, it is
recommended to use a flat ribbon on MB1440 CN8 with all unused signals tied to the
ground on the target side.
Bridge I
2
C
I
2
C signals are available on MB1440 CN7 and CN9. The adapter module also provides
optional 680-ohm pull-ups, which can be activated by closing JP10 jumpers. In that case,
the target voltage (T_VCC) must be provided to any of the MB1440 connector accepting it
(CN1, CN2, CN6, or JP10 jumpers).
Bridge CAN
CAN logic signals (Rx/Tx) are available on MB1440 CN9, they can be used as input for an
external CAN transceiver. It is also possible to connect directly the CAN target signals to
MB1440 CN5 (target Tx to CN5 Tx, target Rx to CN5 Rx), provided that:
1. JP7 is closed, meaning CAN is ON.
2. CAN voltage is provided to CN5 CAN_VCC.
Bridge UART
UART signals with hardware flow control (CTS/RTS) are available on MB1440 CN9 and
MB1440 CN7. They need a dedicated firmware to be programmed on the main module
before being used. With this firmware, a second Virtual COM port is available and the mass
storage interface (used for Drag-and-drop flash programming) disappears. The firmware
selection is reversible and is done by STLinkUpgrade applications as shown in
Figure 13.
The hardware flow control may be activated by physically connecting UART_RTS and/or
UART_CTS signals to the target. If not connected, the second virtual COM port works
without hardware flow control. Note that the hardware flow control activation/deactivation
cannot be configured by software from the host side on a virtual COM port; consequently
configuring a parameter related to that on the host application has no effect on the system
behavior.
To reach high UART frequency, it is recommended to use a flat ribbon on MB1440 CN7 with
all unused signals tied to the ground on the target side.
Figure 13. Firmware selection for a second Virtual COM port
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