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データシートサーチシステム |
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データシートサーチシステム |
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FS970X データシート(PDF) 30 Page - Fortune Semiconductor Corp. |
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FS970X データシート(HTML) 30 Page - Fortune Semiconductor Corp. |
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30 / 46 page  FS970X Rev. 4.4 30/46 AGND OSR 2.4 V 2 k VRH VRL INH INL R X 0 ~ 500 R REF 1 k AGND OSR 1.2 V 2 k VRH VRL INH INL R X 0 ~ 5 M R REF 10 M AGND OSR 1.2 V 2 k VRH VRL INH INL R X 0 ~ 5 k R REF 10 k AGND OSR 1.2V 2 k VRH VRL INH INL R X 0 ~ 50 k R REF 100 k AGND OSR 1.2 V 2 k VRH VRL INH INL R X 0 ~ 500 k R REF 1 M (a) (b) (c) (d) (e) AGND OSR 1.2 V 2 k VRH VRL INH INL R X 0 ~ 50 M R REF 10 M (f) VRH - VRL = 0.8 V ~ 0.686 V INH - INL = 0 V ~ 0.343 V VRH - VRL = 1.0 V ~ 0.706 V INH - INL = 0 V ~ 0.353 V INH - INL = 0 V ~ 0.395 V VRH - VRL = 1.176 V ~ 0.789 V VRH - VRL = 1.198 V ~ 0.799 V INH - INL = 0 V ~ 0.399 V VRH - VRL = 1.20 V ~ 0.80 V INH - INL = 0 V ~ 0.40 V VRH - VRL = 1.20 V ~ 0.20 V INH - INL = 0 V ~ 1.00 V Graph 14. The converting voltage range of scale-type resistor measurement. The 1 st condition is low resistance under 5 k . The os D can be obtained by setting the reference voltage equivalent to 0.8 V. The 0.8 V can be generated by the fixed voltage generator in the chip. (as shown in Chart 7), through ACBUF output, connecting to AX3 and then into VRH. Or obtained through ACBUF, connecting to AX5, through Ωpower supply, and returning to VRH. The 2 nd condition is middle resistance between 50 k ~ 5 M. The os D can be obtained by setting the reference voltage equivalent to 1.0 V. Under this condition, the os D value, just like the other measuring os D value, can be processed by the same parameter. The 3 rd condition is high resistance – 50 M . Because the various range of the reference voltage is too great, the value of os D can be easily use an approximate number. Therefore it can be obtained by reducing the Bargrapg display speed and using the reading of the high resolution output, or reduce the digit of the Bargraph to 10 or 20 digit. By using the method illustrated in this section to set the reference voltage between 0.8 V and 1.0V when cut in the resistor file and calibrate the os D of under 5 k and 50 k ~ 5 M respectively. According to different measurement range to select different os D . Then using the calculation shown in 8.5.2, we can complete the calculation of 50 digit of fast Bargraph display. The Conversion of Digital Output & Equivalent Voltage Take the high resolution digital output of FS970X, the output, SUM1<23:0>, is the compensation value of 2/24bits. Whereas, SUM1<23> is the symbol bit – “0” = positive, and “1” = negative. The floating point locates between SUM1<22> and SUM1<21>. Assuming SUM1<23:0>=0010_1000_0000_0000_0000_0000, the equivalent floating point calculation is: Formula 10 625 . 0 125 . 0 5 . 0 2 0 ...... 2 0 2 0 2 1 2 0 2 1 0000 _ 0000 _ 0000 _ 0000 _ 1000 _ 10 . 00 1 SUM 22 5 4 3 2 1 Assuming SUM1<23:0>=1101_1111_1111_1111_1111_1111, the equivalent floating point calculation is: |
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