What is the function of CPCKS? What are the recommended values?
CPCKS provides Charge pump frequency, the faster the frequency, the stronger drive
capacity is, for 1900 different series, CPCKS settings is different, the recommended
values as shown below:
| IC type | CPCKS recommended value |
| SN8P1907 | 15.625Khz@4MHZ |
| SN8P1908 | 20KHZ@4MHZ |
| SN8P1909 | 20KHZ@4MHZ |
| SN8P1917 | 13K~15.6kHZ @Normal Mode |
| SN8P1919 | 13K~15kHZ @Normal Mode |
| SN8P1927 | 13K~15.6KHZ @Normal Mode |
| SN8P1929 | 13K~15KHZ @Normal Mode |
Reference document: SN8P1900 Series Datasheet