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S-35720D01A-K8T2U Datasheet(PDF) 11 Page - Seiko Instruments Inc |
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S-35720D01A-K8T2U Datasheet(HTML) 11 Page - Seiko Instruments Inc |
11 / 21 page FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER Rev.1.1_00 S-35720 Series 11 Power-on Detection Circuit In order for the power-on detection circuit to operate normally, raise the power supply voltage of the IC from 0.2 V or lower so that it reaches 1.8 V of the operation power supply voltage minimum value within 10 ms, as shown in Figure 12. Within 10 ms 1.8 V (Operation power supply voltage min.) 0 V *1 0.2 V or lower *1. 0 V means that there is no potential difference between the VDD pin and the VSS pin of the S-35720 Series. Figure 12 How to Raise the Power Supply Voltage If the power supply voltage of the S-35720 Series cannot be raised under the above conditions, the power-on detection circuit may not operate normally and an oscillation may not start *1. In such case, perform the operations shown in "1. When power supply voltage is raised at RST _______ pin = "L" " and "2. When power supply voltage is raised at RST _______ pin = "H" ". *1. When one-shot loop time-out or handshake time-out is selected as the option. 1. When power supply voltage is raised at RST _______ pin = "L" Set the RST _______ pin to "L" until the power supply voltage reaches 1.8 V or higher. While the RST _______ pin is set to "L", the oscillation start signal becomes "H", and the crystal oscillation circuit normally oscillates. If the RST _______ pin is set to "H" after the power supply voltage reaches 1.8 V, the oscillation start signal becomes "L" within 500 ms, and the oscillation status is maintained. The current consumption increases as mentioned below while the RST _______ pin is set to "L". • When the product without a pull-up resistor is selected: 1.7 μA typ. • When the product with a pull-up resistor is selected: 30 μA typ. 0.2 V or lower 0 V*1 RST pin input Oscillation start signal Oscillation circuit output 10 ms Oscillation start signal "H" "L" within 500 ms 1.8 V (Operation power supply voltage min.) *1. 0 V means that there is no potential difference between the VDD pin and the VSS pin of the S-35720 Series. Figure 13 When Power Supply Voltage is Raised at RST _______ Pin = "L" |
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