STM32F051R4U7(2012) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32F051R4U7
(Rev.:2012)

Low- and medium-density advanced ARM™-based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces

STMicroelectronics 

Electrical characteristics

Figure 15. Typical application with a 32.768 kHz crystal

2ESONATORWITH

INTEGRATEDCAPACITORS

#,

#,

K( Z

RESONATOR

/3#?).

/3#?/5 4

$RIVE

PROGRAMMABLE

AMPLIFIER

STM32F051x

F,3%

Note:

6.3.7

-3

An external resistor is not required between OSC32_IN and OSC32_OUT and it is forbidden

to add one.

Internal clock source characteristics

The parameters given in Table 38 are derived from tests performed under ambient

temperature and supply voltage conditions summarized in Table 20.

High-speed internal (HSI) RC oscillator

Table 38. HSI oscillator characteristics(1)

Symbol

Parameter

Conditions

fHSI

TRIM

DuCy(HSI)

ACCHSI

tsu(HSI)

Frequency

HSI user trimming step

Duty cycle

Accuracy of the HSI

oscillator (factory

calibrated)

HSI oscillator startup

time

TA = –40 to 105 °C

TA = –10 to 85 °C

TA = 0 to 70 °C

TA = 25 °C

IDD(HSI)

HSI oscillator power

consumption

1. VDDA = 3.3 V, TA = –40 to 105 °C unless otherwise specified.

2. Guaranteed by design, not tested in production.

3. Data based on characterization results, not tested in production.

Min Typ

-

8

-

-

45(2)

-

–3.8(3)

-

–2.9(3)

-

–1.3(3)

-

–1

-

1(2)

-

Max

1(2)

55(2)

4.6(3)

2.9(3)

2.2(3)

1

2(2)

Unit

MHz

%

%

%

%

%

%

µs

-

80 100(2) µA

62/105

Doc ID 022265 Rev 3

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