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FM3135 Datasheet(PDF) 7 Page - Ramtron International Corporation |
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FM3135 Datasheet(HTML) 7 Page - Ramtron International Corporation |
7 / 21 page FM3135 Integrated RTC/Alarm/FRAM & Embedded Crystal Rev. 1.2 Feb. 2009 Page 7 of 21 Cal Output/SquareWave Output When the RTC calibration mode is invoked by setting the CAL bit (register 00h, bit 2), the ACS output pin will be driven with a 512 Hz square wave and the alarm will continue to operate. Since most users only invoke the calibration mode during production, this should have no impact on the otherwise normal operation of the alarm. The ACS output may also be used to drive the system with a continuous frequency. The AL/SW bit (register 0Eh, bit 7) must be a ‘0’. A user-selectable frequency is provided by F0 and F1 (register 0Eh, bits 5 and 6). The frequencies are 1, 512, 4096, and 32768 Hz. If a continuous frequency output is enabled by using the 512Hz or SquareWave out functions, the alarm function will not be available. Figure 4. ACS Pin Requires Pullup The ACS pin is an open-drain output that needs to be pulled up to a supply. The ACS pin and pullup resistor draws current only when the alarm is triggered. Table 4. Alarm Match Bit Examples Seconds Minutes Hours Date Months Alarm condition 1 1 1 1 1 No match required = alarm 1/second 0 1 1 1 1 Alarm when seconds match = alarm 1/minute 0 0 1 1 1 Alarm when seconds, minutes match = alarm 1/hour 0 0 0 1 1 Alarm when seconds, minutes, hours match = alarm 1/date 0 0 0 0 1 Alarm when seconds, minutes, hours, date match = alarm 1/month ACS 1M Ω MCU FM3135 VBAK |
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