12.9 Temperature sensor
The STTS22H is an ultra-low power temperature sensor with 0.5 °C accuracy and ALERT support. The STTS22H
sensor is managed with an I
2
C, shared with a ToF sensor (up to 400 kHz), and an interrupt line. The I
2
C read/
write address is 0x7F/0x7E. The interrupt line is mapped on a WKUP PIO.
Table 18. Temperature sensor I/O interface
PIO Configuration
PH8 SDA (I2C3.SDA)
PH7 SCL (I2C3.SCL)
PF2 TEMP_INTN (TEMP_INTN)
12.10 Expansion connectors
Warning: The standard way to power STM32U5A9J-DK from expansion connectors is to use 5V_VIN
input power pin and GND pins from CN9.
By default, pin 5V of CN9 is an output power to expansion connectors. Do not use it to power MB1829 to avoid
conflict with the 5V source selection jumper (JP4). For development purposes, the 5V pin of CN9 might be used
as 5V input to the MB1829, providing the jumper is removed from the JP4 header.
The two connectors (CN9 and CN10) provide access to many ports: 4‑bit SDMMC, two SAI, three I
2
C, a USART,
an LPUART, two SPI, ADCs, timers, and GPIOs. They include four spare pins to connect any other PIOs from the
design. They also provide access to power supplies from MB1829.
Some interfaces are not available by default, and others are exclusive to other onboard functions. Refer to
Section 13.7 Expansion connectors (CN9 and CN10) for pin assignment details and limitations.
Note: ADC4_IN6 and ADC4_IN7 functions of expansion connector (CN10) are not connected by default because
they are exclusive with respectively UCPD.ADC1 and UCPD.ADC2 functions of USBC. If two additional ADCs
are necessary for user application, it is recommended to use ADC4_IN15 and ADC4_IN16 from PD11/PD12
providing SAI2 is not used on expansion connectors (solder bridges can handle it, refer to solder bridges table)
Note: SDMMC2_D1 and SDMMC2_D2 functions of expansion connector CN9 are connected by default and are
exclusive with respectively UCPD.CC1 and T.SWO (JTDO) functions (solder bridges can handle it, refer to the
solder bridges table)
Note: SAI1 function of the expansion connector (CN10) is shared with the audio codec function which is not populated
on
‑
board (the audio codec can support a high impedance state on this bus).
Note: Some USART3 signals of expansion connectors might be connected to the DSI_V3 connector (solder bridges
can handle it, refer to the solder bridges table)
Note: SPI2 signals of expansion connectors might be connected to the DSI_V3 connector (solder bridges can handle
it, refer to solder bridges table)
12.11
User button function
Warning: Debounce filter, serial protection, and external pull-down are not present on the user button
function.
Note: The user button schematics have been optimized, so it is up to the user to manage internal pull-down and
debounce filtering by software. If the user wants to use PC13 as an output, it is recommended to disconnect the
serial resistor (or change it to 220 Ω for example) to protect it from unwanted short circuits to VDD through the
button.
UM2967
Temperature sensor
UM2967 - Rev 1
page 35/68
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