 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
DA14530 Datasheet(PDF) 67 Page - Renesas Technology Corp |
|
|
|||||||||||||||||||||||||||||
DA14530 Datasheet(HTML) 67 Page - Renesas Technology Corp |
|
|
67 / 333 page  DA14530 Low Power Bluetooth 5.1 SoC Final Datasheet Revision 3.4 21-Dec-2021 CFR0011-120-00 67 of 332 © 2021 Renesas Electronics 6 5 4 3 0 CLK_FREQ_TRIM_REG[XTAL32M_TRIM] 2.25pF 1.2pF 75fF 1 2 7 150fF Decoding 3 -> 7 ... 2.25pF ... ... Figure 19: XTAL32MHz Oscillator Frequency Trimming 10.2.2 Automated Trimming and Settling Notification There is provision in the DA14530 for automating the actual trimming of the 32 MHz crystal oscillator. This is a special hardware block that realizes the XTAL trimming in a single step. Notification about the XTAL oscillator being settled after applying the trim value is also provided in form of an interrupt, namely, the XTAL32RDY_IRQn line. The automated mechanism for applying the trim value and signaling that the oscillator is settled is described in Figure 20. The XTAL32RDY_IRQn is always triggered as soon as an internal counter reaches the value programmed at XTALRDY_CTRL_REG. This counter runs on the RC32M clock if the system is powering up, or on a selected low power clock if the system is waking up. The enabling of the XTAL32M is always done by HW. There are two sections until the interrupt notifies the software that the XTAL32M can be used: ● The start-up section, where the XTAL32M oscillator is slowly converging towards the initial frequency of the crystal. This section ends with the application of the trim value to achieve a <50 ppm, 32 MHz clock ● The settling section, where the XTAL32M oscillator settles to the preferred frequency after the application of the trim value which is done automatically by HW There are two ways of deciding when the start-up section ends and when the trim values are supposed to be applied. This decision is controlled by TRIM_CTRL_REG[XTAL_TRIM_SELECT] bit field: ● Counter Mode: trim value stored in the CLK_FREQ_REG is applied as soon as an internal counter reaches the value XTAL_COUNT_N-1. This is the default mode ● Current Mode: trim value is applied as soon as the current drops The different modes are illustrated in Figure 20. |
Similar Part No. - DA14530 |
|
Similar Description - DA14530 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
