Precaution for use the crystal unit with low CL
1. Note
A crystal unit with low CL is very sensitive to load capacitance variations of the oscillation circuit, so the environment the crystal is operated in. (*1)
Consequently, the tolerance of the oscillation frequency in the actual circuit will exceed the tolerance defined in the crystal specification significantly.
Please refer to the below page for the detail.
https://www5.epsondevice.com/cn/information/technical_info/crystal/circuit.html#2
2.Products
-
1)For STMicroelectronics
- Target MCU: STM32F401
- Epson 32kHz crystal unit
Name | CL [pF] |
Part number | Pulling Sensitivity *[ppm/pF] | Deviation max* [sec/pF] |
---|---|---|---|---|
FC-135R | 6.0 | X1A0001410006 | 34 | 88 |
FC-12M | 5.0 | X1A0000610018 | 81 | 210 |
FC1610AN |
5.0 | TBD | TBD | TBD |
* : absolute value
-
2)For NXP Semiconductors
- Target Real Time Clock: PCF85263
- Epson 32kHz crystal unit
Name | CL [pF] |
Part number | Pulling Sensitivity *[ppm/pF] | Deviation max* [sec/pF] |
---|---|---|---|---|
FC-135R | 6.0 | X1A0001410006 | 34 | 88 |
FC-135 | 6.0 | Q13FC13500018 | 35 | 91 |
MC-146 | 6.0 | Q13MC14620006 | 47 | 122 |
- Target MCU: LPC54xxx
- Epson 32kHz crystal unit
Name | CL [pF] |
Part number | Pulling Sensitivity *[ppm/pF] | Deviation max* [sec/pF] |
---|---|---|---|---|
FC-135R | 6.0 | X1A0001410006 | 34 | 88 |
* : absolute value
-
3)For Texas Instruments
- Target MCU: MSP430FR5969
- Epson 32kHz crystal unit
Name | CL [pF] |
Part number | Pulling Sensitivity *[ppm/pF] | Deviation max* [sec/pF] |
---|---|---|---|---|
MC-146L | 3.7 | X1A0001520001 | 47 | 122 |
* : absolute value
-
4)For Renesas Electronics
- Target MCU: RX200、RX600、RX700 Series
- Epson 32kHz crystal unit
Name | CL [pF] |
Part number | Pulling Sensitivity *[ppm/pF] | Deviation max* [sec/pF] |
---|---|---|---|---|
MC-146L | 3.7 | X1A0001520001 | 47 | 122 |
* : absolute value
3.Notes
CL=5.0[pF] and 6.0[pF] are not our standard specification so if you will use them please contact our sales person. We would like to check about specification in our company.