s-1702ecc01-i6t1g Seiko Instruments Inc., s-1702ecc01-i6t1g Datasheet - Page 29

• 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.

ULTRA-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
Rev.1.1
3. 2 Delay circuit
3. 2. 1 Internal delay types (S-1702Axx, Bxx, Cxx, Dxx, Exx, Fxx, Gxx, Hxx, Jxx, Kxx)
3. 2. 2 External delay types (S-1702Lxx, Mxx, Nxx, Pxx)
_00
In the internal delay types, when V
when V
(refer to point B in Figure 29). The delay circuit does not make delay when V
(−V
The delay time (t
In the external delay types, the delay time of the detection signal can be set by connecting a capacitor (C
between the CD and VSS pins.
The delay time (t
constant of the external capacitor (C
The delay constant (Ta = 25°C) is as follows.
Figure 33 shows the equivalent circuit of the CD pin (external delay type).
Caution 1.
DET
t
Delay constant: 5.3 (min.), 6.3 (typ.), 7.3 (max.)
D
) or less (refer to point A in Figure 29).
[ms] = Delay constant × C
SENSE
2.
has reached the release voltage (+V
Design the board so that a current will not flow into or flow out from the CD (RESX) pin,
because this pin’s impedance is high. (Otherwise that may provide incorrect delay time.)
There is no limit for the capacitance of the external capacitor (C
current of the capacitor can be ignored against the built-in constant current value.
Leakage current causes deviation in delay time. When the leakage current is the built-in
constant current or more, the IC does not release.
Figure 33 Equivalent Circuit of CD Pin (External Delay Type)
D
D
) is fixed in the internal circuit of internal delay types.
) is determined according to the built-in constant current, approx. 100 nA (typ.), and the time
C
D
V
SS
D
[nF]
SENSE
D
Seiko Instruments Inc.
), and can be calculated by the following equation.
CD
is turned on, the delay circuit makes a certain delay, after the point
V
SS
DET
V
IN
), and sets the VDOUT pin to output an output signal
V
V
SS
IN
SENSE
D
) as long as the leakage
is the detection voltage
S-1702 Series
29
D
)