SPRS698J November 2010 – September 2021 TMS320F28062 , TMS320F28062F , TMS320F28063 , TMS320F28064 , TMS320F28065 , TMS320F28066 , TMS320F28067 , TMS320F28068F , TMS320F28068M , TMS320F28069 , TMS320F28069F , TMS320F28069M
PRODUCTION DATA
The on-chip crystal oscillator X1 and X2 pins are 1.8-V level signals and must never have 3.3-V level signals applied to them. If a system 3.3-V external oscillator is to be used as a clock source, it should be connected to the XCLKIN pin only. The X1 pin is not intended to be used as a single-ended clock input, it should be used with X2 and a crystal.
The typical specifications for the external quartz crystal (fundamental mode, parallel resonant) are listed in Table 8-12. Furthermore, ESR range = 30 to 150 Ω. For Table 8-12, Cshunt should be less than or equal to 5 pF.
FREQUENCY (MHz) | Rd (Ω) | CL1 (pF) | CL2 (pF) |
---|---|---|---|
5 | 2200 | 18 | 18 |
10 | 470 | 15 | 15 |
15 | 0 | 15 | 15 |
20 | 0 | 12 | 12 |