On the B-L4S5I-IOT01A Discovery kit for the IoT node, there are two MP34DT01 microphones: one with LR
pulled to VDD and the second with LR pulled low. DFSDM1_CKOUT and DFSDM1_DATIN2 are connected to
both. In addition, both microphones are spaced at 21 mm apart for the beamforming algorithm to work. Indeed,
several algorithm configurations are available for the user to find the best trade-off between audio output quality
and resource consumption. For more details, refer to the user manual STEVAL-IHM038V1: 3-phase BLDC/PMSM
motor drive up to 50 W, suitable for fan controllers (UM1697) on the www.st.com website.
The MP34DT01 is available in an HCLGA (3 mm x 4 mm x 1 mm) 4LD package, in a top-port design, SMD-
compliant, EMI-shielded package and it is guaranteed to operate over an extended temperature range from
-40 °C to +85 °C.
6.10.2 Capacitive digital sensor for relative humidity and temperature (HTS221)
HTS221 is an ultra-compact sensor for relative humidity and temperature. It includes a sensing element and a
mixed-signal ASIC to provide the measurement information through digital serial interfaces.
The sensing element consists of a polymer dielectric planar capacitor structure capable of detecting relative
humidity variations and it is manufactured using a dedicated ST process.
The HTS221 is available in a small top-holed cap land grid array (HLGA-6L 2 mm x 2 mm x 0.9 mm) package
guaranteed to operate over a temperature range from -40 °C to +120 °C.
The main features of the HTS221 are:
• 0 to 100% relative humidity range,
• Low-power consumption: 2 μA @ 1 Hz ODR,
• Selectable ODR from 1 Hz to 12.5 Hz
• High relative humidity (rH) sensitivity: 0.004% rH/LSB
• Humidity accuracy: ± 3.5% rH, from +20% to +80% rH
• Temperature accuracy: ± 0.5 °C, from +15 °C to +40 °C
• Embedded 16-bit ADC
• 16-bit humidity and temperature output data
• SPI and I2C interfaces. On the B-L4S5I-IOT01A Discovery kit for the IoT node, the I2C2 bus from
STM32L4S5VIT6U is used.
• Factory calibrated
• Tiny 2 mm x 2 mm x 0.9 mm package
• ECOPACK
®
compliant
6.10.3 High-performance 3-axis magnetometer (LIS3MDL)
LIS3MDL is an ultra-low-power high-performance three-axis magnetic sensor.
LIS3MDL has user-selectable full scales of ±4 / ±8 / ±12 / ±16 gauss.
The self-test capability allows the user to check the functionality of the sensor in the final application.
The device may be configured to generate interrupt signals for magnetic field detection.
LIS3MDL includes an I
2
C serial bus interface, that supports standard and fast mode (100 and 400 kHz), and an
SPI serial standard interface. On the B-L4S5I-IOT01A Discovery kit for the IoT node, the I2C2 bus from
STM32L4S5VIT6U is used. LIS3MDL is available in a small thin plastic land grid array LGA-12 package
(2.0 mm x 2.0 mm x 1.0 mm) and is guaranteed to operate over an extended temperature range of -40 to +85 °C.
LIS3MDL is also ECOPACK
®
, RoHS and “Green” compliant.
6.10.4 3D accelerometer and 3D gyroscope (LSM6DSL)
LSM6DSL is a system-in-package featuring a 3D digital accelerometer and a 3D digital gyroscope performing at
0.65 mA in high-performance mode and enabling always-on low-power features for an optimal motion experience
for the consumer.
The event-detection interrupts enable efficient and reliable motion tracking and contextual awareness,
implementing hardware recognition of free-fall events, 6D orientation, click and double-click sensing, activity or
inactivity, and wake-up events.
LSM6DSL supports main OS requirements, offering real, virtual and batch sensors with 4 Kbytes for dynamic data
batching.
UM2708
STMicroelectronics sensors
UM2708 - Rev 1
page 21/43
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