S-1702 Datasheet, PDF (28/45 Pages) Seiko Instruments Inc – Built-in overcurrent protection circuit

SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series
Rev.2.2_01
3. 1. 2 Input voltage (VIN) detection types (S-1702Exx, Fxx, Gxx, Hxx, Nxx, Pxx)
Each detector block of S-1702Exx, Fxx, Gxx, Hxx, Nxx, and Pxx detects the input voltage (VIN).
VIN
V_IN
Current
supply
R_a
V_ref
+
−
R_b
Delay ^VDOUT ^Output
circuit
circuit
VDOUT
CD ^*1
C_D
VSS
N₁
R_c
V_SS VSS
*1. S-1702Nxx and S-1702Pxx only
Figure 31 Block Diagram (Input Voltage (VIN) Detection Type)
3. 1. 3 SENSE voltage (VSENSE) detection types (S-1702Jxx, Kxx)
Each detector block of S-1702Jxx and Kxx detects the SENSE voltage (VSENSE).
SENSE
VIN
V_SENSE
V_IN
Current
supply
R_a
V_ref
+
−
Delay ^VDOUT Output
circuit
circuit
R_b
VDOUT
N₁
R_c
VSS
V_SS
Figure 32 Block Diagram (SENSE Voltage (VSENSE) Detection Type)
Caution
Use the SENSE pin as an input pin when detecting the external power supply voltage. If
applying an input voltage (VIN) while a potential is being applied to the SENSE pin, an error
occurs in the release voltage of the detector. Apply a voltage to the SENSE pin after applying
the input voltage (VIN).
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