ST92250JDV2TC 查看數據表（PDF） - STMicroelectronics

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ST92250JDV2TC

8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM, E³ ™ (EMULATED EEPROM), CAN 2.0B AND J1850 BLPD

STMicroelectronics 

ST92F124/F150/F250 - RESET AND CLOCK CONTROL UNIT (RCCU)

CERAMIC RESONATORS

Murata Electronics CERALOCK resonators have been tested with the ST92F150 at 3, 3.68, 4 and 5 MHz.

These recommended resonators have built-in capacitors (see Table 32).

The test circuit is shown in Figure 69.

Figure 69. Test Circuit

VDD

ST92F150

OSCIN OSCOUT

VSS

Rd

CERALOCK

C1 C2

Table 32 shows the recommended conditions at different frequencies.

Table 32. Obtained Results

Freq.

(MHz)

5

4

3

3.68

Parts Number

CSTCR5M00G55A-R0

CSTCC5M00G56A-R0

CSTCR4M00G55A-R0

CSTCC4M00G56A-R0

CSTCC3M00G56A-R0

CSTCC3M68G56A-R0

C1 (pF)

39

47

39

47

47

47

C2 (pF)

39

47

39

47

47

47

Rd (Ohm)

0

0

0

0

0

0

Advantages of using ceramic resonators:

CSTCR and CSTCC types have built-in loading

capacitors.

Smallest loading capacitor resonators are recom-

mended for standard applications.

Highest loading capacitor resonators are recom-

mended for automotive applications with CAN and

tight frequency tolerance.

Test conditions:

The evaluation conditions are 4.5 to 5.5 V for the

supply voltage and -40° to 105° C for the tempera-

ture range.

Caution:

These circuit conditions are for design reference

only.

Recommended C1, C2 value depends on the cir-

cuit board used.

For tight frequency tolerance applications, please

contact the nearest Murata office for more de-

tailled PCB evaluation regarding layout.

Note 1:

Attention must be paid to leakage currents around

the OSCIN pin. Leakage paths from VDD could al-

ter the DC polarization of the inverter stage and in-

troduce a mismatch with the second stage, and

possibly stop the clock signal. It is recommended

to surround the oscillator components by a ground

ring on the printed circuit board and if necessary to

apply a coating film to avoid humidity problems.

Note 2:

Attention must be paid to the capacitive loading of

OSCOUT. OSCOUT must not be used to drive ex-

ternal circuits.

139/429

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