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STM32U385CG Datasheet(PDF) 128 Page - STMicroelectronics

Part # STM32U385CG
Description  Ultra-low-power Arm® Cortex®-M33 32-bit MCUTrustZone®FPU, 144 DMIPS, 1 MB flash memory, 256 KB SRAM, SMPS, crypto
PDF  224 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32U385CG Datasheet(HTML) 128 Page - STMicroelectronics

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Low-speed external user clock generated from an external source
In bypass mode, the LSE oscillator is switched off and the input pin is directly connected to the LSE clock detector
(LSECSS). The external clock signal has to respect the parameters specified in Table 72, as shown also by the
waveforms in Figure 30 and Figure 31
Table 72. Low-speed external user clock characteristics
Specified by design and not tested in production.
Symbol
Parameter
Min
Typ
Max
Unit
fLSE_ext
User external clock source
frequency
5
32.768
40
kHz
VLSE_ext_PP
OSC32_IN peak-to-peak
amplitude
0.3
-
VSW
V
VLSE_ext
OSC32_IN input range
0
-
VSW(1)
tw(LSEH)
OSC32_IN high or low time for
square signal input
10
-
-
μs
tw(LSEL)
1. In case VBAT mode is used, VLSE_ext must be lower than VBOR0 in order to respect this requirement when the switch to VBAT
occurs.
Figure 30. AC timing diagram for low-speed external square clock source
VLSEH
70%
30%
t
VLSEL
tw(LSEH)
tw(LSEL)
VLSE_ext
tLSE = 1/fLSE_ext
VLSE_ext_PP
Figure 31. AC timing diagram for low-speed external sinusoidal clock source
VLSE_ext
VLSE_ext_PP
t
tLSE_ext = 1/fLSE_ext
High-speed external clock generated from a crystal/ceramic resonator
The high-speed external (HSE) clock can be supplied with a 4 to 48 MHz crystal/ceramic resonator oscillator. All
the information given in this paragraph are based on design simulation results obtained with typical external
components specified in the table below.
STM32U385xx
Electrical characteristics
DS14830 - Rev 2
page 128/224



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