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S-5470D21I-M5T1U Datasheet(PDF) 9 Page - Seiko Instruments Inc |
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S-5470D21I-M5T1U Datasheet(HTML) 9 Page - Seiko Instruments Inc |
9 / 24 page ULTRA-LOW CURRENT CONSUMPTION NORMALLY-OFF FAINT SIGNAL DETECTION IC Rev.1.3_01 S-5470 Series 9 Operation The S-5470 Series detects either certain current level or the difference of current level. The operation of the S-5470 Series is described below, using CMOS output and active "H" products as examples. 1. Basic operation when detecting certain current level (INM pin = VSS) The S-5470 Series operates as follows when the INM pin is connected to VSS pin. (1) If IINP is lower than IDET, an "L" level signal is output from the OUT pin. (2) If IINP increases and becomes equal to or higher than IDET, an "H" level signal is output from the OUT pin (point A in Figure 14). Even if IINP decreases and falls below IDET, as long as IINP is higher than IREL, an "H" level signal is output from the OUT pin. (3) If IINP then decreases further and becomes equal to or lower than IREL, an "L" level signal is output from the OUT pin (point B in Figure 14). Remark IINP: Current input to the INP pin IDET: Detection current (refer to "4. 1 Detection current (IDET)") IREL: Release current (refer to "4. 2 Release current (IREL)") Caution 1. There are internal diodes at the INP pin and the INM pin. Therefore, in order to input a current to the INP pin and the INM pin, an input voltage of at least the forward voltage of these diodes is required. 2. Feed-through current (IPEAK = 100 nA) flows around the time when the OUT pin voltage switches, as shown in Figure 14. Therefore, if the input current is fixed around this time, the current consumption will increase. OUT *1 *1 + − INP INM *1 *1 IDET IINP + − VDD VSS *1 Current comparator Current amplifier Current adder IINP *1. Parasitic diode Figure 13 Diagram of the Operation when Detecting Certain Current Level IINP H L Current consumption (IDD) IPEAK = 100 nA OUT pin output voltage (VOUT) IDET IREL Hysteresis width B A (3) (1) (2) Figure 14 Operation when Detecting Certain Current Level |
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