SPC574K72E5 datasheet(50/127 Pages) STMICROELECTRONICS

50 / 127 page

Electrical characteristics

SPC574Kxx

50/127

DocID023601 Rev 5

Figure 12. Test circuit

3.10.3

Internal oscillator (IRCOSC)

Values in this table do not include the die and package capacitances given by Cs_xtal/Cs_extal in Table 24 (External

Oscillator electrical specifications).

Configurations 10000–11111 should not be used. Configurations 10000–11100 result in same capacitances of

configurations 00011–01111. Configurations 11101, 11110, and 11111 select maximum capacitances.

IXTAL

OFF

PCB GND

Tester

ALC

Z = R + j

L

VEXTAL = 0 V

VXTAL = 0 V

ALC INACTIVE

Conditions

XTAL

EXTAL

VSSOSC

VSS

VDDOSC

Bias current

Comparator

Table 26. Internal RC oscillator electrical specifications

Symbol

Parameter

Conditions

Value

Unit

Min

Typ Max

fTarget

CC D IRCOSC target frequency

—

MHz

f

var_noT CC P IRC frequency variation without

temperature compensation

TJ < 150 °C

–8

—

f

var_T

CC T IRC frequency variation with temperature

compensation

TJ < 150 °C

–1.5

—

+1.5

f

var_SW

— T IRC frequency accuracy after software

trimming accuracy(1)

Trimming temperature

–0.5

—

+0.5

tstart_noT CC T Startup time to reach within fvar_noT

Factory trimming already

applied

——

µs

tstart_T CC T Startup time to reach within fvar_T

Factory trimming already

applied

—

120

µs

The typical user trim step size

f

TRIM = 0.35 %.

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