I²C Bus; Connection Of The Voltage/Current Analog Senses To The Stm32 Adc; Figure 9. 5 V Only Current Capability; Figure 10. Vbus Voltage Sense For The Stm32 Adc - ST X-NUCLEO-SRC1M1 User Manual

When the STM32 embeds the UCPD peripheral, the STM32 manages the 5 V only sources without an external
pullup resistor (JP2 and JP3 are connected to CC1_UCPD and CC2_UCPD, respectively).
1.2.5 I²C bus
An I²C communication is present between the
through the SCL and SDA pins.
The TCPP02-M18
unsoldering R28. The high level is then connected to the I2C_ADD pin of the TCPP02-M18.
The X-NUCLEO-SRC1M1
1.2.6

Connection of the voltage/current analog senses to the STM32 ADC

The X-NUCLEO-SRC1M1
• ADC_VBUSc: measures the V
Note: It is mandatory to ensure the system operation (for example, vSafe0V measurement).
• ADC_Prov: for information on the provider path voltage.
Voltage dividers (ratio 6) are compatible with 24 V DC voltages.
The X-NUCLEO-SRC1M1
it to the STM32 ADC (ADC_Isense).
The TCPP02-M18
mΩ).
The capacitor footprints (C9 and C11) have been added for potential filtering on analog senses.
UM2973 - Rev 1
Figure 9.
3.3V
R32 R33
36k 12k
R35 SH18
0
CC1-5V
Resistor table 1
I²C default address is 0x68. You can change it to 0x6A by closing the SH16 solder bridge and
expansion board embeds two 1kΩ I²C pullup resistors (R11 and R12).
has two voltage senses connected to the STM32 ADC:
voltage
BUS
Figure 10. V
presents the analog current sense output of the
has an internal differential amplifier (42 V/V) that measures the current flowing through R5 (7
5 V only current capability
R34
4.7k
SH19
CC2-5V
STM32 Nucleo master port and the
voltage sense for the STM32 ADC
BUS
R8
200k
ADC_VBUSc
R9
40.2k
Hardware architecture
3.3V
R36 R37 R38
36k 12k 4.7k
R39 SH20 SH21
0
Resistor table 2
TCPP02-M18 (U1) slave port
TCPP02-M18 (IANA pin) and connects
UM2973
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