ST X-NUCLEO-SNK1M1, Руководство пользователя

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Figure 10. Dead battery mode circuitry
DB/
3.3V
GND
3.3V
CN10
C6
1u
U2
NC
2
ST715PU33R
GND 4
1
Vin
3
8
6
FB
5
7
9
EXP
J5
J6
N.M.
C5
220n
VBUS
LDO_OUT
LDO_OUT
NRST
DB_OUT
Jumper-Female
J3 JUMPER-con2 strip-male
J4
JUMPER-con2 strip-male
Jumper-Female
R25 0
R22 0
To select the dead battery operation mode on the X-NUCLEO-SNK1M1 , JP3 and JP4 jumpers must be fit.
Table 2. J3 and J4 power mode selection jumpers
Power mode
Jumpers
J3 (LDO_OUT) J4 (RESET)
ST-LINK powered mode
(open) (open)
Dead battery mode
(fit) (fit)
JP3 jumper connects the V
BUS
path from the Type-C connector to the LDO (U2) which is connected to the STM32
Nucleo development board 3.3 V path and can power the entire solution.
When fitted, JP5 jumper forces the STM32 I/O negative reset to level 1. It must be connected when the STM32 is
powered by the
X-NUCLEO-SNK1M1 .
By default, the TCPP01-M12 dead battery option has been set to be driven by an STM32 microcontroller pin
through R26 solder bridge, thus removing the TCPP01-M12 dead battery clamp when GPIO is connected on ST
morpho connector (CN10-24). The alternative operating mode is to fit the TCPP01-M12 dead battery option to
3V3 through the R25 mounting solder bridge (consequently, R26 must be not fitted).
In the application firmware package, this option has been included in the firmware examples where a GPIO (ST
morpho CN10-24) properly drives the dead battery option.
1.2.8 Power connector
CN2 power connector can be used to connect a load and monitor the V
BUS
voltage level negotiated by the system
with a Source attached to CN1 Type-C connector.
UM2773
Hardware architecture
UM2773 - Rev 1
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