поискавой системы для электроныых деталей |
|
SI8503-C-IM датащи(PDF) 11 Page - List of Unclassifed Manufacturers |
|
SI8503-C-IM датащи(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 37 page Si85xx Preliminary Rev. 0.4 11 Integrator reset Option 1 is selected by connecting TRST to VDD. In this mode, the Si85xx is held in reset as long as the signals on R1–R4 satisfy the logic equations of Table 11. It is typically used in applications where the gate drivers are external to the system controller IC (the gate driver delay ensures reset is completed prior to the start of measurement). Reset Option 2 is selected by connecting a timing resistor (RTRST in Figure 5) from the TRST input to ground. It is typically used in applications where the gate drivers are on-board the controller. In this mode, the on-chip reset timer is triggered when the signals on R1–R4 satisfy the logic equations in Table 11. Once triggered, the timer maintains integrator in reset for time duration tR as programmed by the value of resistor RTRST. The user must select the value of resistor RTRST to terminate the reset cycle prior to the start of measurement under worst-case timing conditions. Note that values of tR below the specified value in "1. Electrical Specifications" on page 4 results in increased integrator output offset error and increased output noise on VOUT. Moreover, tR’s time is summarized by the following equation (see Table 9): tR = 10 ns/k where values of RTRST that produce a reset time less than 150 ns (RTRST < 15 k) should not be used. Figure 5. Programming Reset Time (tR) 2.4. Total Measurement Error The Si85xx’s absolute accuracy is affected by the following factors: Ambient operating temperature VDD supply voltage Time Table 10 includes a composite of all environmental and operating conditions that can ultimately affect the absolute measurement accuracy of the Si85xx. The total worst-case accuracy at full scale can be estimated by the sum of the initial accuracy (up to ±5%) plus aging (up to ±1.5%) and supply variations (up to ±3.5%). For example, the total measurement error expected for a device operating at a given VDD supply of 5 V (±10%) is 10% if the device is operated over a temperature range of –40 to 125 °C for up to 10 years. If the temperature range is limited to 0 to 85 °C, the measurement error can be improved by up to 2%. See Figure 6 for details. 2.5. Effect of Temperature on Accuracy Offset voltage present at the Si85xx output terminals (output offset voltage) is calibrated out each time VDD is applied to the Si85xx; so, its error contribution is minimized when the temperature at which calibration occurred is at or near the steady-state operating temperature of the Si85xx. For example, applying VDD at 25 °C (offset cal is performed) and operating at 85 °C will result in a larger offset error than operating at 50 °C. The effect of this error is summarized in Figure 6. The chart is referenced to 25 °C. If the Si85xx is powered up at 25 °C and then operated at 125 °C with no auto- calibration performed (i.e., the power is not cycled at 125 °C, which causes an auto-calibration), a 3% measurement error can be expected. Table 9. Typical Reset Time vs. RTRST Resistance RTRST Reset Time (tR) 15 k 150 ns 100 k 1µs 1M 9µs 2.2 M 20 µs Si85xx TRST RTRST Table 10. Total Measurement Error Contributors Error Contributor % Error Added Initial error @ given VDD ±10%, 25 °C ±5% Temperature variation –40 to 125 °C ±3.5% Aging (10 years) ±1.5% |
Аналогичный номер детали - SI8503-C-IM |
|
Аналогичное описание - SI8503-C-IM |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |