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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L9803 датащи(PDF) 72 Page - STMicroelectronics |
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L9803 датащи(HTML) 72 Page - STMicroelectronics |
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72 / 126 page  On-Chip Peripherals L9803 72/126 T0 = 0143h = 323K (50 Celsius) VTo = 015Ch = 348 LSB (conversion of 1.7V, sensor output) and the sensor output is 2V, converted by the ADC in code 0110011001 = 019Ah = 410LSB, the temperature of the chip is TEMP = 019Ah * 0143h / 015Ch = 017Ch equivalent to: TEMP = 410 * 323 / 348 = 380 K = 107 °C Note: The sensor circuit may have two kind of error: one translating its output characteristic up and down and the other changing its slope. The described trimming recovers only the translation errors but can not recover slope error. After trimming, being TTRIM the trimming temperature, the specified precision can be achieved in the range TTRIM-80, max[TTRIM+80, 150 °C]. Precision is related to the read temperature in Kelvin. 5.5.7 Register Description CONTROL/STATUS REGISTER (ADCCSR) Address: 0072h — Read/Write Reset Value: 0010 0000 (20h) Bit 7,6 = Reserved Bit 5 =COCO (Read Only) Conversion Complete COCO is set (by the ADC) as soon as a conversion is completed (results can be read). COCO is cleared by setting ADST=1 (start of new conversion). If COCO=0 a conversion is running, if COCO=1 no conversion is running. Bit 4 = ADIE A/D Interrupt Enable This bit is used to enable / disable the interrupt function: 0: interrupt disabled 1: interrupt enabled Bit 3= Reserved Bit 2= ADST Start Conversion When this bit is set a new conversion starts. ADST is automatically reset when the conversion is completed (COCO=1). Bits 1-0 = CH1-CH0 Channel Selection These bits select the analog input to convert. See Table 12 for reference. 7 0 0 0 COCO ADIE 0 ADST CH1 CH0 |
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