S1009 Datasheet, PDF (28/43 Pages) Seiko Instruments Inc – SUPER-LOW CURRENT CONSUMPTION SUPER HIGH-ACCURACY VOLTAGE

SUPER-LOW CURRENT CONSUMPTION SUPER HIGH-ACCURACY VOLTAGE DETECTOR WITH DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING)
S-1009 Series
Rev.5.1_00
3. Change of detection voltage (Nch open-drain output product only)
If there is not a product with a specified detection voltage value in the S-1009N Series, the detection voltage can be
changed by using a resistance divider or a diode, as seen in Figure 33 and Figure 34.
In Figure 33, hysteresis width also changes.
VDD
R_A^*1
(R_A ≤ 100 kΩ)
VIN
S-1009N
R
100 kΩ
OUT
VDD
V_f1
VIN
S-1009N
R
100 kΩ
OUT
R_B
VSS
(Nch open-drain
ouput product)
VSS
(Nch open-drain
output product)
Detection voltage =
R_A + R_B
R_B
• −V_DET
Hysteresis width =
R_A + R_B
R_B
• V_HYS
*1. R_A should be 100 kΩ or less to prevent oscillation.
Caution
If R_A and R_B are large, the hysteresis width
may also be larger than the value given by
the above equation due to the feed-through
current.
Figure 33
Detection voltage = V_f1 + (−V_DET)
Figure 34
Caution 1. The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
2. Note that the hysteresis width may be larger as the following equation shows when using the
above connections. Perform thorough evaluation using the actual application to set the
constant.
Maximum hysteresis width =
R_A + R_B
R_B
• V_HYS + R_A • 20 μA
28
Seiko Instruments Inc.