S1011 Datasheet, PDF (22/43 Pages) Seiko Instruments Inc – BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING) VOLTAGE DETECTOR

HIGH-WITHSTAND VOLTAGE BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING) VOLTAGE DETECTOR
S-1011 Series
Rev.1.2_00
Also, the relation between the external setting hysteresis width (V_HX) and the hysteresis width (V_HYS) is calculated
by equation below. Error due to R_SENSE also occurs to the relation in a similar way to the detection voltage.
( ) ^VHX ^{= V}HYS ^×
1+
R_A
R_B
··· (4)
A
V_DX
R_A
−V_DET
R_B
VDD
SENSE
R_SENSE
VSS
OUT
Figure 31 Detection Voltage External Setting Circuit
Caution 1. When externally setting the detection voltage, perform the operation with −V_DET = 10.0 V product.
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2. If the current flowing through R_B is set to 1 μA or less, the error may become larger.
3. If the parasitic resistance and parasitic inductance between V_DX − point A and point A − VDD pin
are larger, oscillation may occur. Perform thorough evaluation using the actual application.
4. If R_A and R_B are large, the SENSE pin input impedance becomes higher and may cause a
malfunction due to noise. In this case, connect a capacitor between the SENSE pin and the VSS
pin.
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