3.2 On-board Clock Sources
PIC32 WFI32 Curiosity HPC Board has four on-board clock sources for various sections and applications.
Secondary Oscillator
RTCC operation for the WFI32E02 Module can be derived
either through internal LPRC or external 32.768 kHz oscillator (SOSC) available on
the PIC32 WFI32 Curiosity HPC Board. The 32.768 kHz
crystal oscillator is connected to SOSC pins (SOSCI and SOSCO) of the WFI32E02 Module.
| Parameter | Attribute |
|---|---|
| Clock source | External crystal |
| Part number | FC-12M 32.7680KA-A5 |
| Reference designator | Y100 |
| Frequency | 32.768 kHz |
| Tolerance | ±20 ppm |
| Operating temperature range | -40°C to +85°C |
| ESR | 90 kΩ |
| Load capacitance | 12.5 pF |
| Drive level | 0.5 uW (maximum) |
| Aging | ±3 ppm per year (maximum) |
| Package | 2-SMD, no lead (2.05 mm x 1.20 mm) |
Ethernet Oscillator (X400)
By default, the WFI32E02 Module drives the Ethernet
clock; however, the provision of an external 50 MHz crystal oscillator (X400) is
provided on the PIC32 WFI32 Curiosity HPC Board.
Note:
- The user can configure the ETH_CLK_OUT signal of the WFI32E02 Module as a clock source to the Ethernet interface but not as an input to the WFI32E02 Module.
- By default, the Ethernet oscillator (X400) is not populated on the PIC32 WFI32 Curiosity HPC Board.
PICkit On- Board 4 (PKOB4) Oscillator (Y500)
On-board ATSAME70N21B-CNT MCU requires an external 12 MHz oscillator. By default,
this oscillator (Y500) is populated on the PIC32 WFI32 Curiosity HPC Board.
| Parameter | Attribute |
|---|---|
| Clock source | External CMOS oscillator |
| Part number | DSC6011JI1B-012.0000 |
| Reference designator | Y500 |
| Alternate part number | ECS-1633-120-BN-TR |
| Frequency | 12 MHz |
| Tolerance | ±50 ppm |
| Operating temperature range | -40°C to +85°C |
| Package | 4-VLGA, (2.5 mm x 2 mm) |
USB Hub Oscillator (Y600)
On-board two port USB Hub (USB2512B-I/M2) requires an external 24 MHz oscillator. By
default, this oscillator (Y600) is populated on the PIC32 WFI32 Curiosity HPC Board.
| Parameter | Attribute |
|---|---|
| Clock source | External CMOS oscillator |
| Part number | DSC6011HI1B-024.0000 |
| Reference designator | Y600 |
| Alternate part number | ASA-24.000 MHZ-L-T |
| Frequency | 24 MHz |
| Tolerance | ±50 ppm |
| Operating temperature range | -40°C to +85°C |
| Package | 4-VLGA, (1.6 mm x 1.2 mm) |
USB-to-UART Converter Oscillator (X600)
On-board two port USB Hub (USB2512B-I/M2) requires an external 24 MHz oscillator. By
default, this oscillator (X600) is populated on the PIC32 WFI32 Curiosity HPC Board.
| Parameter | Attribute |
|---|---|
| Part number | CSTNE12M0G550000R0 |
| Reference Designator | X600 |
| Frequency | 12 MHz |
| Tolerance | +/-0.2% |
| Operating temperature range | -40℃ to +85℃ |
| Package | 3-SMD, Non-standard |