ST72321R7-Auto datasheet(197/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

Electrical characteristics

Doc ID 13829 Rev 1

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19.5.4

RC oscillators

Figure 80.

Typical fOSC(RCINT) versus TA

Note:

To reduce disturbance to the RC oscillator, it is recommended to place decoupling

capacitors between VDD and VSS as shown in Figure 100.

Table 117.

OSCRANGE selection for typical resonators

Supplier

fOSC (MHz)

Typical ceramic resonators(1)

Resonator characteristics given by the ceramic resonator manufacturer. For more information on these

resonators, please consult www.murata.com.

Reference

Recommended OSCRANGE option bit

configuration

Murata

CSTCC2M00G56A-R0

MP mode(2)

LP mode is not recommended for 2 MHz resonator because the peak to peak amplitude is too small

(> 0.8V).

CSTCR4M00G55B-R0

MS mode

CSTCE8M00G55A-R0

HS mode

CSTCE16M0G53A-R0

Table 118.

RC oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fOSC(RCINT)

Internal RC oscillator frequency

(see Figure 80)

TA =25°C, VDD =5V

3.5

5.6

MHz

3.2

3.4

3.6

3.8

-45

130

TA(°C)

Vdd = 5V

Vdd = 5.5V

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