S1003 Datasheet, PDF (34/42 Pages) Seiko Instruments Inc – MANUAL RESET BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING)

MANUAL RESET BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING) HIGH-ACCURACY VOLTAGE DETECTOR
S-1003 Series
Rev.1.0_00
2. 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-1003N Series, the detection voltage can be
changed by using a resistance divider or a diode, as seen in Figure 40 and Figure 41.
In Figure 40, hysteresis width also changes.
V_DD
R_A^*1
(R_A ≤ 100 kΩ) ^VIN
R_B
GND
R
100 kΩ
VDD
OUT
MR
VSS CD
*2
(Nch open-drain
output product)
V_DD
V_f1
V_IN
*1
R
100 kΩ
VDD
OUT
MR
VSS CD
(Nch open-drain
output product)
GND
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.
*2. Set to V_IN or GND (MR pin non-active).
Detection voltage = V_f1 + (−V_DET)
*1. Set to V_IN or GND (MR pin non-active).
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 40
Figure 41
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
3. When using the manual reset function, refer to "2. 4 When connecting resistance (R_A)
between power supply voltage (V_DD) and VDD pin" in "„ Operation" to set the constant.
34
Seiko Instruments Inc.