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ST7LITEU05 数据表(PDF) 79 Page - STMicroelectronics |
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ST7LITEU05 数据表(HTML) 79 Page - STMicroelectronics |
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79 / 115 page ![]() ST7LITEU05 ST7LITEU09 79/115 13.3.5 Internal RC oscillator To improve clock stability and frequency accuracy, it is recommended to place a decoupling capacitor, typically 100nF, between the VDD and VSS pins as close as possible to the ST7 device 13.3.5.1 Internal RC oscillator calibrated at 5.0V The ST7 internal clock can be supplied by an internal RC oscillator (selectable by option byte). Notes: 1. See “INTERNAL RC OSCILLATOR ADJUSTMENT” on page 22 2. Tested in production at 5.0 V only 13.3.5.2 Internal RC oscillator calibrated at 3.3V The ST7 internal clock can be supplied by an internal RC oscillator (selectable by option byte). Notes: 1. See “INTERNAL RC OSCILLATOR ADJUSTMENT” on page 22 2. Tested in production at 3.3 V only Figure 44. Typical accuracy with RCCR=RCCR0 vs VDD= 2.4-6.0V and Temperature Symbol Parameter Conditions Min Typ Max Unit fRC Internal RC oscillator frequency RCCR = FF (reset value), TA=25°C,VDD=5V 4.4 MHz RCCR = RCCR01 ),TA=25°C,VDD=5V 8 ACCRC Accuracy of Internal RC oscilla- tor with RCCR=RCCR01) TA=25°C, VDD=4.5 to 5.5V 2 ) -2.0 +2.0 % TA=0 to +85°C, VDD=4.5 to 5.5V 2 ) -2.5 +4.0 % TA=0 to +125°C, VDD=4.5 to 5.5V 2 ) -3.0 +5.0 % TA=-40°C to 0°C, VDD=4.5 to 5.5V 2 ) -4.0 +2.5 % tsu(RC) RC oscillator setup time TA=25°C, VDD=5V 4 2) µs Symbol Parameter Conditions Min Typ Max Unit fRC Internal RC oscillator frequency RCCR = FF (reset value), TA=25°C,VDD=3.3V 4.3 MHz RCCR = RCCR11 ),TA=25°C,VDD=3.3V 8 ACCRC Accuracy of Internal RC oscilla- tor with RCCR=RCCR11) TA=25°C, VDD=3.0 to 3.6V 2 ) -1.0 +1.0 % TA=0 to +85°C, VDD=3.0 to 3.6V 2 ) -2.5 +4.0 % TA=0 to +125°C, VDD=3.0 to 3.6V 2 ) -3.0 +5.0 % TA=-40°C to 0°C, VDD=3.0 to 3.6V 2 ) -4.0 +2.5 % tsu(RC) RC oscillator setup time TA=25°C, VDD=3.3V 4 2) µs -2.2 -2.0 -1.8 -1.6 -1.4 -1.2 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 RC5V@-45C RC5V@25C RC5V@90C RC5V@130C RC5V@0C 1 |
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