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S35390A-H Datasheet(PDF) 18 Page - Seiko Instruments Inc |
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S35390A-H Datasheet(HTML) 18 Page - Seiko Instruments Inc |
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18 / 51 page  FOR AUTOMOTIVE 105°C OPERATION 2-WIRE REAL-TIME CLOCK S-35390A H Series Rev.2.2_01 18 Power-on Detection Circuit and Register Status The power-on detection circuit operates by power-on the S-35390A H Series, as a result each register is cleared; each register is set as follows. Real-time data register: 00 (Y), 01 (M), 01 (D), 0 (day of the week), 00 (H), 00 (M), 00 (S) Status register 1: "01h" Status register 2: "80h" INT1 register: "80h" INT2 register: "00h" Clock correction register: "00h" Free register: "00h" "1" is set in the POC flag (B0 in the status register 1) to indicate that power has been applied. To correct the oscillation frequency, the status register 2 goes in the mode the output of user-set frequency, so that 1 Hz clock pulse is output from the 1 INT pin. When "1" is set in the POC flag, be sure to initialize. The POC flag is set to "0" due to initialization so that the output of user-set frequency mode is cleared (Refer to " Register Status After Initialization"). For the regular operation of power-on detection circuit, as seen in Figure 20, the period to power-up the S-35390A H Series is that the voltage reaches 1.3 V within 10 ms after setting the IC’s power supply voltage at 0 V. When the power-on detection circuit is not working normally is; the POC flag (B0 in the status register 1) is not in "1", or 1 Hz is not output from the 1 INT pin. In this case, power-on the S-35390A H Series once again because the internal data may be in the indefinite status. Moreover, regarding the processing right after power-on, refer to " Flowchart of Initialization and Example of Real-time Data Set-up ". Within 10 ms 1.3 V 0 V *1 *1. 0 V indicates that there are no potential differences between the VDD pin and VSS pin of S-35390A H Series. Figure 20 How to Raise the Power Supply Voltage |
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