Table 12. Reference Clock and Crystal Characteristics (VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA =
Parameter | Symbol | Test Condition | Min | Typ | Max | Unit |
|
|
|
|
|
|
|
| Reference Clock |
|
|
|
| |
|
|
|
|
|
|
|
RCLK Supported Frequencies* |
|
| 31.130 | 32.768 | 40000.0 | kHz |
RCLK Frequency Tolerance |
|
| — | 50 | ppm | |
|
|
|
|
|
|
|
REFCLK_PRESCALE |
|
| 1 | — | 4095 |
|
|
|
|
|
|
|
|
REFCLK |
|
| 31.130 | 32.768 | 34.406 | kHz |
|
|
|
|
|
|
|
| Crystal Oscillator |
|
|
|
| |
|
|
|
|
|
|
|
Crystal Oscillator Frequency |
|
| — | 32.768 | — | kHz |
|
|
|
|
|
|
|
Crystal Frequency Tolerance* |
|
| — | 100 | ppm | |
|
|
|
|
|
|
|
Board Capacitance |
|
| — | — | 3.5 | pF |
|
|
|
|
|
|
|
*Note: The Si4734/35 divides the RCLK input by REFCLK_PRESCALE to obtain REFCLK. There are some RCLK frequencies between 31.130 kHz and 40 MHz that are not supported. See AN332, Table 6 for more details.
16 | Rev. 1.0 |
