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DS12885S+TR Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS12885S+TR Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 22 page Real-Time Clocks 10 ____________________________________________________________________ Pin Description (continued) PIN SO, PDIP EDIP PLCC TQFP NAME FUNCTION 19 19 23 21 IRQ Active-Low Interrupt Request Output. The IRQ pin is an active-low output of the device that can be used as an interrupt input to a processor. The IRQ output remains low as long as the status bit causing the interrupt is present and the corresponding interrupt-enable bit is set. The processor program normally reads the C register to clear the IRQ pin. The RESET pin also clears pending interrupts. When no interrupt conditions are present, the IRQ level is in the high- impedance state. Multiple interrupting devices can be connected to an IRQ bus, provided that they are all open drain. The IRQ pin is an open-drain output and requires an external pullup resistor to VCC. 20 — 24 22 VBAT Connection for a Primary Battery. (DS12885 Only.) Battery voltage must be held between the minimum and maximum limits for proper operation. If a backup supply is not supplied, VBAT must be grounded. Connect the battery directly to the VBAT pin. Diodes in series between the VBAT pin and the battery may prevent proper operation. UL recognized to ensure against reverse charging when used with a lithium battery. 21 21 (DS12887A/ DS12C887A) 25 24 RCLR Active-Low RAM Clear. The RCLR pin is used to clear (set to logic 1) all the general-purpose RAM, but does not affect the RAM associated with the RTC. To clear the RAM, RCLR must be forced to an input logic 0 during battery-backup mode when VCC is not applied. The RCLR function is designed to be used through a human interface (shorting to ground manually or by a switch) and not to be driven with external buffers. This pin is internally pulled up. Do not use an external pullup resistor on this pin. 23 23 27 26 SQW Square-Wave Output. The SQW pin can output a signal from one of 13 taps provided by the 15 internal divider stages of the RTC. The frequency of the SQW pin can be changed by programming Register A, as shown in Table 1. The SQW signal can be turned on and off using the SQWE bit in Register B. The SQW signal is not available when VCC is less than VPF. 24 24 28 28 VCC DC Power Pin for Primary Power Supply. When VCC is applied within normal limits, the device is fully accessible and data can be written and read. When VCC is below VPF reads and writes are inhibited. |
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