s-1702ecc01-i6t1g Seiko Instruments Inc., s-1702ecc01-i6t1g Datasheet - Page 20

• Manufacturer Part Number: s-1702ecc01-i6t1g
• Description: Ultra-low Current Consumption 150 Ma Voltage Regulator With Built-in High-accuracy Voltage Detector And Reset Input Function
• Manufacturer: Seiko Instruments Inc.

20
ULTRA-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series
2. 6 Oscillation
2. 7 Temperature characteristics of detection voltage
2. 8 Temperature characteristics of release voltage
2. 9 Temperature characteristics of hysteresis voltage
In applications where a resistor is connected to the input side (Figure 22), the through-type current which is
generated when the detector output voltage (V
to Through-type current × Input resistance across the resistor. When the input voltage drops below the detection
voltage as a result, the detector output voltage (V
current stops, its resultant voltage drop disappears, and the detector output voltage (V
The through-type current is then generated again, a voltage drop appears, and repeating the process finally
induces oscillation.
Figure 23 Example of Detection Voltage Temperature Characteristics (When −V
The temperature change
of the detection voltage as follows:
The temperature changes of the release voltage and the detection voltage consequently have the same sign.
The temperature change of the hysteresis voltage is expressed as
∆
∆
The shaded area in Figure 23 is the range where −V
the temperature coefficient of the detection voltage is ±100 ppm/°C. (Refer to *7 of Table 7 for how to
calculate the temperature change [mV/°C] of the detection voltage.)
+
+
∆
∆
Ta
Ta
V
V
DET
DET
=
−
Figure 22 Example of Bad Implementation of Detection Voltage Changer
−
+
∆
V
V
−
∆
DET
DET
Ta
V
DET
×
−V
∆
=
DET
−
∆
∆
3.000
VSS
−
Ta
V
VIN
V
+
∆
DET
V
[V]
HYS
Ta
V
DET
DET
×
R
R
−40
of the release voltage is calculated by the temperature change
a
b
∆
Seiko Instruments Inc.
−
∆
V
Ta
V
IN
DET
DOUT
S-1702
25
block
) goes from low to high (release) causes a voltage drop equal
VD
DOUT
) goes from high to low. In this state, the through-type
DET
varies within the operating temperature range when
85
∆
+
∆
+0.30 mV/°C
−0.30 mV/°C
Ta
V
Ta [°C]
VDOUT
DET
−
∆
−
∆
Ta
V
DET
DOUT
DET
and is calculated as follows:
) goes from low to high.
= 3.0 V Typ.)
Rev.1.1
∆
−
∆
Ta
V
DET
_00