STM32F101XC datasheet(53/106 Pages) STMICROELECTRONICS

53 / 106 page

STM32F101xC, STM32F101xD, STM32F101xE

Electrical characteristics

Doc ID 14610 Rev 7

53/106

Caution:

To avoid exceeding the maximum value of CL1 and CL2 (15 pF) it is strongly recommended

to use a resonator with a load capacitance CL  7 pF. Never use a resonator with a load

capacitance of 12.5 pF.

Example: if you choose a resonator with a load capacitance of CL = 6 pF, and Cstray = 2 pF,

then CL1 = CL2 = 8 pF.

Figure 20.

Typical application with a 32.768 kHz crystal

5.3.7

Internal clock source characteristics

The parameters given in Table 25 are derived from tests performed under ambient

temperature and VDD supply voltage conditions summarized in Table 10.

High-speed internal (HSI) RC oscillator

ai14129b

OSC32_OU T

OSC32_IN

fLSE

CL1

STM32F10xxx

32.768 KH z

resonator

Resonator with

integrated capacitors

Bias

controlled

gain

CL2

Table 25.

HSI oscillator characteristics(1)

VDD = 3.3 V, TA = –40 to 85 °C unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

Frequency

MHz

ACCHSI

Accuracy of the HSI

oscillator

User-trimmed with the RCC_CR

Refer to application note AN2868 “STM32F10xxx internal RC oscillator (HSI) calibration” available from

the ST website www.st.com.

1(3)

Guaranteed by design, not tested in production.

Factory-

calibrated(4)

Based on characterization, not tested in production.

TA = –40 to 105 °C

–2

2.5

TA = –10 to 85 °C

–1.5

2.2

TA = 0 to 70 °C

–1.3

TA = 25 °C

–1.1

1.8

tsu(HSI)

(4)

HSI oscillator startup

time

µs

IDD(HSI)

(4)

HSI oscillator power

consumption

100

µA

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