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S-80731AL-AV-X Datasheet(PDF) 6 Page - Seiko Instruments Inc |
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S-80731AL-AV-X Datasheet(HTML) 6 Page - Seiko Instruments Inc |
6 / 42 page HIGH-PRECISION VOLTAGE DETECTOR S-807 Series Seiko Instruments Inc. 5 Advantage over the S-805 Series The S-807 Series, in comparison with conventional reset ICs such as the S-805 Series, offers greater detection voltage precision (twice that of conventional units) and lower current consumption (half that of conventional units). These characteristics result in the following advantages over conventional units. 1. Advantages of greater detection voltage precision 1.1 Detecting lithium battery service life The discharge characteristics of lithium batteries are shown in Figure 4. When using the S-805 Series, the service life can be detected over t1. When using the S-807 Series, it can be detected over t2. This improvement in detection precision of the S- 807 Series means that batteries can be used over more of their service life. 1.2 Detecting a power voltage at two points It is usual for the CPU to detect the power voltage at two points, one to caution and the other to reset. The service life of battery may also be detected at two points, one to caution and the other to request immediate replacement. Two voltage values to be detected (No. 1 and No. 2) do not cross and the voltage can be detected correctly. 1.3 Voltage drop when modifying detection voltage If no voltage to be detected is suitable, the voltage can be set higher in Nch open-drain output products by using a resistor divider. (Example : when detecting 6V or 9V.) When 8V is detected using the S-8054HN (a 4V ±5% device), the -Vdet tolerance becomes 2 ×4.00×±0.05=0.8V (R1=R2). In constrast, the S- 80740AN (a 4V ±2.4% device) can hold down the tolerance to 2 ×4.00×±0.024=0.384V (R1=R2). Must be close V t No. 2 No. 1 Figure 5 t1 S-807 S-805 V t Figure 4 t2 R2 R1 Figure 6 Nch open-drain output product S-807 XXAN/SN |
Similar Part No. - S-80731AL-AV-X |
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Similar Description - S-80731AL-AV-X |
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