ST B-L4S5I-IOT01A - On-board Sensors

Memory
• Up to 64 kbits of EEPROM (depending on the version)
• I
2
C interface access bytes
• RF interface access blocks of 4 bytes
• Write time:
– From I
2
C: typical 5 ms for 1 byte
– From RF: typical 5 ms for 1 block
• Data retention: 40 years
• Write cycles endurance:
– 1 million write cycles at 25 °C
– 600k write cycles at 85 °C
– 500k write cycles at 105 °C
– 400k write cycles at 125 °C
Fast transfer mode
•
Fast data transfer between I
2
C and RF interfaces
• Half-duplex 256-byte dedicated buffer
Energy harvesting
• Analog output pin to power external components
Data protection
• User memory: One to four configurable areas, protectable in reading and/or write by three 64-bit passwords
in RF and one 64-bit password in I
2
C
• System configuration: protected in write by a 64-bit password in RF and a 64-bit password in I
2
C
Note: The hardware layout is ready to support a Sub-GHz low-power-programmable RF module (SPSGRF-868 or
SPSGRF-915). The footprint is implemented (M3 designation), but no module is soldered.
6.10
STMicroelectronics sensors
Several STMicroelectronics sensors are available on the B-L4S5I-IOT01A Discovery kit for the IoT node and are
listed below:
• Two on-board ST-MEMS audio sensor omnidirectional digital microphones (MP34DT01)
• Capacitive digital sensor for relative humidity and temperature (HTS221)
• High-performance 3-axis magnetometer (LIS3MDL)
• 3D accelerometer and 3D gyroscope (LSM6DSL)
• 260 hPa to 1260 hPa absolute digital output barometer (LPS22HB)
• Time-of-Flight and gesture detection sensor (VL53L0X)
6.10.1 Two on-board ST-MEMS microphones (MP34DT01)
The MP34DT01 is an ultra-compact, low-power, omnidirectional, digital ST-MEMS microphone built with a
capacitive sensing element and an IC interface.
The sensing element, capable of detecting acoustic waves, is manufactured using a specialized silicon
micromachining process dedicated to producing audio sensors.
The IC interface is manufactured using a CMOS process that allows designing a dedicated circuit able to provide
a digital signal externally in PDM format.
The MP34DT01 has an acoustic overload point of 120 dBSPL with a 63 dB signal-to-noise ratio and –26 dBFS
sensitivity.
UM2708
STMicroelectronics sensors
UM2708 - Rev 1
page 20/43