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DS1803-010 Datasheet(PDF) 8 Page - Dallas Semiconductor |
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DS1803-010 Datasheet(HTML) 8 Page - Dallas Semiconductor |
8 / 11 page DS1803 8 of 11 5. After this period, the first clock pulse is generated. 6. A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the VIHMIN of the SCL signal) in order to bridge the undefined region of the falling edge of SCL. 7. The maximum tHD:DAT has only to be met if the device does not stretch the LOW period (tLOW) of the SCL signal. 8. A fast mode device can be used in a standard mode system, but the requirement tSU:DAT > 250 ns must then be met. This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line tRMAX+ tSU:DAT = 1000 + 250=1250 ns before the SCL line is released. 9. CB - total capacitance of one bus line in picofarads, timing referenced to (0.9)(VCC) and (0.1)(VCC). 10. Typical values are for tA = 25 °C and nominal supply voltage. 11. -3 dB cutoff frequency characteristics for the DS1803 depend on potentiometer total resistance: DS1803-010; 1 MHz, DS1803-50; 200 kHz, DS1803-100; 100 kHz. 12. Address Inputs, A0, A1, and A2, should be tied to either VCC or GND depending on the desired address selections. 13. Absolute linearity is used to determine wiper voltage versus expected voltage as determined by wiper position. Device test limits are ±1.6 LSB. 14. Relative linearity is used to determine the change in voltage between successive tap positions. Device test limits ±0.5 LSB. 15. Fast mode. 16. Standard mode. 17. Valid at 25 °C only. |
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