STM32WB35CC datasheet(119/193 Pages) STMICROELECTRONICS

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DS11929 Rev 11

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STM32WB55xx STM32WB35xx

Electrical characteristics

169

6.3.10

External clock source characteristics

High-speed external user clock generated from an external source

The high-speed external (HSE) clock is supplied with a 32 MHz crystal oscillator or a sine or

a square wave.

The devices include internal programmable capacitances that can be used to tune the

crystal frequency in order to compensate the PCB parasitic one.

The characteristics in Table 54 and Table 55 are measured over recommended operating

conditions, unless otherwise specified. Typical values are referred to TA = 25 °C and 

VDD = 3.0 V.

Table 54. HSE crystal requirements(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fNOM

Oscillator frequency

MHz

fTOL

Frequency tolerance

Includes initial accuracy, stability over

temperature, aging and frequency pulling

due to incorrect load capacitance.

(2)

ppm

Load capacitance

ESR

Equivalent series resistance

100

Ω

1. 32 MHz XTAL is specified for two specific references: NX2016SA and NX1612SA.

2. Refer to the standard specification: 50 ppm for BLE, 40 ppm for 802.15.4 and when both BLE and 802.15.4 are used.

Table 55. HSE clock source requirements(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

MHz

fTOL

Frequency tolerance

Includes initial accuracy, stability

over temperature and aging.

(2)

ppm

VHSE

Clock input voltage limits

Sine or square wave, AC-coupled(3)

0.4

1.6

VPP

DuCy(HSE) Duty cycle

tr, tf

Rise and fall times

10% - 90% square wave

15 * VPP

φn(HSE)

Phase noise for 32 MHz

Offset = 10 kHz

-127

dBc/Hz

Offset = 100 kHz

-135

Offset = 1 MHz

-138

1. Guaranteed by design.

2. Refer to the standard specification: 50 ppm for BLE, 40 ppm for 802.15.4 and when both BLE and 802.15.4 are used.

3. Only AC coupled is supported (capacitor 470 pF to 100 nF).

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