S-1702 Datasheet, PDF (21/45 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
Rev.2.2_01
S-1702 Series
 Operation
1. Control of S-1702 Series by using ON / OFF and RESX pins
1. 1 Starting and stopping regulator block
The regulator block can be started and stopped according to the combination of the ON / OFF and RESX pins.
The regulator block switches off the output transistor between the VIN pin and VOUT pin and reduces current
consumption significantly.
The detector block is operating during this period, so only the amount of current consumed by the detector block
flows in the S-1702 Series.
1. 2 Regulator output (VOUT) control: discharge shunt function ^*1
The regulator output (VOUT) can be controlled by combining the ON / OFF and RESX pins.
In the product types having a discharge shunt circuit^*1 (Axx, Bxx, Cxx, Exx, Fxx, Gxx, Jxx, Lxx, Nxx), this circuit
forcibly sets the regulator output (VOUT) the VSS level^*1.
In the product types that do not have a discharge shunt circuit^*1 (Dxx, Hxx, Kxx, Mxx, Pxx), the regulator output
(VOUT) is set at the VSS level by a division resistor of several MΩ between the VOUT pin and VSS pin.
*1. For details of a discharge shunt circuit, refer to “2. 2. 2 Discharge shunt function” in “2. Regulator
Block”.
1. 3 Detector output voltage (VDOUT) control: forcible assertion function
The detector output voltage (VDOUT) is forcibly asserted to the VSS level by combining the ON / OFF and RESX
pins.
When the forcible assertion function is not being used, the result of detection by the detector (release status: “H”,
detection status: “L”) is output from the VDOUT pin.
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