S-5470A21I-M5T1U Datasheet, PDF (12/24 Pages) Seiko Instruments Inc – ULTRA-LOW CURRENT CONSUMPTION

ULTRA-LOW CURRENT CONSUMPTION NORMALLY-OFF FAINT SIGNAL DETECTION IC
S-5470 Series
Rev.1.3_01
4. Explanation of terms
4. 1 Detection current (I_DET)
The detection current (I_DET) is the current at which the output switches to "H".
The detection current varies slightly even among products with the same specification. The variation in detection
current from the minimum detection current (I_DET min.) to the maximum detection current (I_DET max.) is called the
detection current range (refer to Figure 18).
Detection current
I_DET max.
I_DET min.
Detection
current range
I_INP
H
V_OUT
L
Figure 18 Detection Current
4. 2 Release current (I_REL)
The release current (I_REL) is the current at which the output switches to "L".
The release current varies slightly even among products with the same specification. The variation in release
current from the minimum release current (I_REL min.) to the maximum release current (I_REL max.) is called the
release current range (refer to Figure 19).
The range is calculated from the actual detection current (I_DET) of a product and is in the range of I_DET × 0.7 ≤
I_REL ≤ I_DET × 0.9.
I_INP
I_REL max.
I_REL min.
Release current
Release
current range
H
V_OUT
L
Figure 19 Release Current
4. 3 Hysteresis width
The hysteresis width is the current difference between the detection current and the release current (current at
point B − current at point A in "Figure 14 Operation when Detecting Certain Current Level" and "Figure 16
Operation when Detecting the Difference of Current Level").
The hysteresis width between the detection current and the release current prevents malfunction caused by
noise in the input current.
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