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ST7LUS5 数据表(PDF) 94 Page - STMicroelectronics |
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ST7LUS5 数据表(HTML) 94 Page - STMicroelectronics |
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94 / 124 page ![]() Electrical characteristics ST7LUS5, ST7LU05, ST7LU09 94/124 12.3.1 Internal RC oscillator The ST7 internal clock can be supplied by an internal RC oscillator (selectable by option byte). Note: 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. Table 66. Internal RC oscillator calibrated at 5.0V Symbol Parameter Conditions Min Typ Max Unit fRC Internal RC oscillator frequency RCCR = FF (reset value), TA =25°C, VDD = 5V 4.5 MHz RCCR = RCCR0(1), TA = 25°C, VDD =5V 8 ACCRC RC resolution VDD = 5V -2 +2 % Accuracy of internal RC oscillator with RCCR = RCCR0(1) TA = 0°C to +125°C, VDD = 5V -5 +5 TA = -40°C to +125°C, VDD =4.5 to 5.5V TBD TBD IDD(RC) RC oscillator current consumption TA = 25°C, VDD = 5V 900(2) µA tsu(RC) RC oscillator setup time TA = 25°C, VDD = 5V 4(2) µs 1. See Internal RC oscillator adjustment on page 27 2. Guaranteed by Design Table 67. Internal RC oscillator calibrated at 3.3V Symbol Parameter Conditions Min Typ Max Unit fRC Internal RC oscillator frequency RCCR = FF (reset value), TA = 25°C, VDD = 3.3V 4.4 MHz RCCR = RCCR1(1), TA = 25°C, VDD =3.3V 8 ACCRC RC resolution VDD = 3.3V -2 +2 % Accuracy of internal RC oscillator with RCCR = RCCR1(1) TA = 0°C to +125°C, VDD = 3.3V -7 +7 TA = -40°C to +125°C, VDD = 3.0 to 3.6V TBD TBD IDD(RC) RC oscillator current consumption TA = 25°C, VDD = 3.3V 900(2) µA tsu(RC) RC oscillator setup time TA = 25°C, VDD = 3.3V 4(2) µs 1. See Internal RC oscillator adjustment on page 27 2. Guaranteed by Design |
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