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STM32WB55 Datasheet(PDF) 158 Page - STMicroelectronics

Part # STM32WB55
Description  Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5.2 and 802.15.4 radio solution
PDF  193 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32WB55 Datasheet(HTML) 158 Page - STMicroelectronics

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Electrical characteristics
STM32WB55xx STM32WB35xx
158/193
DS11929 Rev 11
6.3.28
Clock recovery system (CRS)
The devices embed a special block for the automatic trimming of the internal 48 MHz
oscillator to guarantee its optimal accuracy over the whole device operational range.
This automatic trimming is based on the external synchronization signal, which can be
derived from USB Sart Of Frame (SOF) signalization, from LSE oscillator, from an external
signal on CRS_SYNC pin or generated by user software.
For faster lock-in during startup it is also possible to combine automatic trimming with
manual trimming action.
6.3.29
Communication interfaces characteristics
I2C interface characteristics
The I2C interface meets the timings requirements of the I2C-bus specification and user
manual rev. 03 for:
Standard-mode (Sm): bit rate up to 100 kbit/s
Fast-mode (Fm): bit rate up to 400 kbit/s
Fast-mode Plus (Fm+): bit rate up to 1 Mbit/s.
The I2C timings requirements are guaranteed by design when the I2C peripheral is properly
configured (see the reference manual).
Table 90. IWDG min/max timeout period at 32 kHz (LSI1)(1)
Prescaler divider
PR[2:0] bits
Min timeout RL[11:0] = 0x000
Max timeout RL[11:0] = 0xFFF
Unit
/4
0
0.125
512
ms
/8
1
0.250
1024
/16
2
0.500
2048
/32
3
1.0
4096
/64
4
2.0
8192
/128
5
4.0
16384
/256
6 or 7
8.0
32768
1. The exact timings still depend on the phasing of the APB interface clock vs. the LSI clock, hence there is always a full RC
period of uncertainty.
Table 91. Minimum I2CCLK frequency in all I2C modes
Symbol
Parameter
Condition
Min
Unit
f(I2CCLK)
I2CCLK
frequency
Standard-mode
-
2
MHz
Fast-mode
Analog filter ON, DNF = 0
9
Analog filter OFF, DNF = 1
9
Fast-mode Plus
Analog filter ON, DNF = 0
19
Analog filter OFF, DNF = 1
16



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