DocID027351 Rev 3
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UM1855
Hardware layout and configuration
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Table 30
shows the assignment of signals to CN13 connector.
The serial communication with the module plugged in CN13 can either use SPI
communication protocol (default) or UART communication protocol.
2.29
Dual-channel sigma-delta modulators STPMS2L
2.29.1 STPMS2L
presentation
With its DFSDM interface, the STM32L476ZGT6 microcontroller can directly interact with
sigma-delta modulator devices, such as STPMS2L.
STPMS2L comprises two analog measuring channels based on second-order sigma-delta
modulators. Typically, it can be used in power metering where both voltage and current
need to be known. One channel measures the voltage, the other channel measures the
current.
DAT port outputs converted measurement data on the DFSDM_DATIN1 line, received by
the STM32L476ZGT6 DFSDM controller. The data from STPMS2L are synchronized with
DFSDM_CKOUT clock generated by the STM32L476ZGT6 DFSDM controller and received
on CLK terminal of STPMS2L.
There are two STPMS2L devices on STM32L476G-EVAL, sharing the DFSDM clock. One is
wired such as to support a power-metering demonstrator. The other allows measuring
temperature using the PT100 sensor.
Table 30. CN13 NFC connector terminal assignment
CN13
terminal
NFC line name
MCU port
Function
1
NFC_IRQOUTN or
UART_TX
PB7
Interrupt output for NFC device
Connected to STM32L476ZGT6 UART RX
2
NFC_IRQINN or
UART_RX
PB6
Interrupt input for NFC device
Connected to STM32L476ZGT6 UART TX
3
NFC_NSS
PF11
SPI slave select
4
NFC_MISO
PB14
SPI data, slave output
5
NFC_MOSI
PB15
SPI data, slave input
6
NFC_SCK
PB13
SPI serial clock
7
+3V3
-
Main power supply/power supply for RF drivers
8
GND
-
Ground
