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DS17885-3 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS17885-3 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 30 page Real-Time Clocks _____________________________________________________________________ 9 Pin Description (continued) PIN 24 28 NAME FUNCTION 21 3 RCLR Active-Low RAM Clear Input. This pin is used to clear (set to logic 1) all the 114 bytes of general-purpose RAM but does not affect the RAM associated with the real time clock or extended RAM. RCLR may be invoked while the part is powered from any supply. The RCLR function is designed to be used via 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. 22 4 VBAUX Auxiliary Battery Input. Required for kickstart and wake-up functions. This input also supports clock/calendar and user RAM if VBAT is at lower voltage or is not used. A standard +3V lithium cell or other energy source can be used. Diodes placed in series between VBAUX and the battery may prevent proper operation. UL recognized to ensure against reverse charging current when used with a lithium battery (www.maxim-ic.com/qa/info/ul/). For 3V VCC operation, VBAUX must be held between +2.5V and +3.7V. For 5V VCC operation, VBAUX must be held between +2.5V and +5.2V. If VBAUX is not used it should be grounded and the auxiliary-battery-enable bit bank 1, register 4BH, should = 0. 23 5 SQW Square-Wave Output. When VCC rises above VPF, bits DV1 and E32k are set to 1. This condition enables a 32kHz square-wave output. A square wave is output if either SQWE = 1 or E32k = 1. If E32k = 1, then 32kHz is output regardless of the other control bits. If E32k = 0, then the output frequency is dependent on the control bits in Register A. 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 3. The SQW signal can be turned on and off using the SQWE bit in Register B or the E32k bit in extended register 4Bh. A 32kHz square wave is also available when VCC is less than VPF if E32k = 1, ABE = 1, and voltage is applied to the VBAUX pin. When disabled, SQW is high impedance when VCC is below VPF. 24 6, 7 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. 2, 3, 16, 20 (DS17x87 only) 11, 18 N.C. No Connection |
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Similar Description - DS17885-3 |
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