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CST12.0MTWA Datasheet(PDF) 120 Page - STMicroelectronics |
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CST12.0MTWA Datasheet(HTML) 120 Page - STMicroelectronics |
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120 / 153 page  ST72334J/N, ST72314J/N, ST72124J 120/153 CLOCK CHARACTERISTICS (Cont’d) 16.5.4 RC Oscillators The ST7 internal clock can be supplied with an RC oscillator. This oscillator can be used with internal or external components (selectable by option byte). Figure 70. Typical Application with RC oscillator Figure 71. Typical Internal RC Oscillator Figure 72. Typical External RC Oscillator Notes: 1. Data based on characterization results. 2. Guaranteed frequency range with the specified CEX and REX ranges taking into account the device process variation. Data based on design simulation. 3. Data based on characterization results done with VDD nominal at 5V, not tested in production. 4. REX must have a positive temperature coefficient (ppm/°C), carbon resistors should therefore not be used. 5. Important: when no external CEX is applied, the capacitance to be considered is the global parasitic capacitance which is subject to high variation (package, application...). In this case, the RC oscillator frequency tuning has to be done by trying out several resistor values. Symbol Parameter Conditions Min Typ Max Unit fOSC Internal RC oscillator frequency 1) see Figure 71 3.60 5.10 MHz External RC oscillator frequency 2) 114 tSU(OSC) Internal RC Oscillator Start-up Time 3) 2.0 ms External RC Oscillator Start-up Time 3) REX=47KΩ, CEX=”0”pF REX=47KΩ, CEX=100pF REX=10KΩ, CEX=6.8pF REX=10KΩ, CEX=470pF 1.0 6.5 0.7 3.0 REX Oscillator external resistor 4) see Figure 72 10 47 K Ω CEX Oscillator external capacitor 0 5) 470 pF OSC1 OSC2 fOSC CEX REX EXTERNAL RC INTERNAL RC VREF + - VDD Current copy Voltage generator CEX discharge ST72XXX 3.2 5.5 VDD [V] 3.8 3.9 4 4.1 4.2 4.3 fosc [MHz] -40°C +25°C +85°C +125°C 0 6.8 22 47 100 270 470 Cex [pF] 0 5 10 15 20 fosc [MHz] Rex=10KOhm Rex=15KOhm Rex=22KOhm Rex=33KOhm Rex=39KOhm Rex=47KOhm |
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