7.5 Bridge functions
STLINK-V3PWR implements a USB interface dedicated to bridging functions from USB to SPI/I
2
C/CAN/GPIOs
of the STM32 microcontroller target. This interface is mainly used by
STM32CubeProgrammer to allow target
programming through SPI/I
2
C/CAN bootloader. An API host software, STLINK-V3-BRIDGE, is provided to extend
the use cases and be used for customized needs.
For details regarding performance, refer to Section 8.5 Debug and bridge performance.
7.5.1 Bridge SPI
SPI signals (SCK, MISO, MOSI, NSS, TVCC, GND) are available on the bridge connector. To reach a high SPI
frequency
, it is recommended to use a flat ribbon (or short wires), with all unused signals tied to the ground on the
target side.
7.5.2
Bridge I
2
C
I
2
C signals (SDA, SCL, TVCC, and GND) are available on the bridge connector
. 560 Ω pull-ups are included in
STLINK-V3PWR.
7.5.3 Bridge CAN
CAN signals (CRX, CTX, TVCC, and GND) are available on the bridge connector and can be used as input for an
external CAN
transceiver.
7.5.4 Bridge GPIOs
Four GPIO signals (IO0, IO1, IO2, IO3, TVCC, and GND) are available on the bridge connector. The I/O direction
is internally managed according to the
I/O software configuration through the public ST bridge software interface.
7.6 LEDs management
STLINK-V3PWR has four bi‑color LEDs
which allow the user to know the status of the product at any time. The
assigned function of each LED is noticed on the housing.
Table 5. LEDs overview
LED reference Label purpose Description
USB LED USB power status
The USB LED indicates the power budget provided by the
host PC.
COM LED ST-LINK communication
This LED shows the ST-LINK status (refer to the technical
note Overview of ST
-LINK derivatives (TN1235))
OUT LED SMU voltage output OUT LED indicates the SMU output state.
AUX LED Auxiliary voltage AUX LED indicates the AUX output state.
7.6.1 LED management
Table 6. USB LED
LED status/color Description
Green Host PC can provide enough energy for SMU and AUX features.
Orange
Host PC cannot provide enough energy for SMU and AUX features. SMU and AUX features
disabled.
Red
Transitional state after USB cable plug and before identification of host port by STLINK-
V3PWR
Slow blinking red USB enumeration in progress
Fast blinking red
Undervoltage detected on VBUS or fatal error during USB enumeration or host port
identification. Check the electrical context, restart
STLINK-V3PWR (do a USB cable removal),
and try another USB port.
UM3097
Bridge functions
UM3097 - Rev 1
page 16/30
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