STM32L151VD datasheet(78/140 Pages) STMICROELECTRONICS

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Electrical characteristics

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Doc ID 022027 Rev 6

6.3.6

Internal clock source characteristics

The parameters given in Table 30 are derived from tests performed under ambient

temperature and VDD supply voltage conditions summarized in Table 14.

High-speed internal (HSI) RC oscillator

Low-speed internal (LSI) RC oscillator

Table 30.

HSI oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSI

Frequency

VDD = 3.0 V

MHz

TRIM

(1)(2)

The trimming step differs depending on the trimming code. It is usually negative on the codes which are

multiples of 16 (0x00, 0x10, 0x20, 0x30...0xE0).

HSI user-trimmed

resolution

Trimming code is not a multiple of 16

± 0.4

0.7

Trimming code is a multiple of 16

± 1.5

ACCHSI

(2)

Based on characterization, not tested in production.

Accuracy of the

factory-calibrated

HSI oscillator

VDDA = 3.0 V, TA = 25 °C

-1(3)

Tested in production.

-1(3)

VDDA = 3.0 V, TA = 0 to 55 °C

-1.5

1.5

VDDA = 3.0 V, TA = -10 to 70 °C

-2

VDDA = 3.0 V, TA = -10 to 85 °C

-2.5

VDDA = 3.0 V, TA = -10 to 105 °C

-4

VDDA = 1.65 V to 3.6 V

TA = -40 to 105 °C

-4

tSU(HSI)

(2)

HSI oscillator

startup time

-3.7

µs

IDD(HSI)

(2)

HSI oscillator

power consumption

-100

140

µA

Table 31.

LSI oscillator characteristics

Symbol

Parameter

Min

Typ

Max

Unit

fLSI

(1)

Tested in production.

LSI frequency

kHz

DLSI

(2)

This is a deviation for an individual part, once the initial frequency has been measured.

LSI oscillator frequency drift

0°C

≤ TA ≤ 85°C

-10

tsu(LSI)

(3)

Guaranteed by design, not tested in production.

LSI oscillator startup time

200

µs

IDD(LSI)

(3)

LSI oscillator power consumption

400

510

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