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DS3234S Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS3234S Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 20 page Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM 8 _____________________________________________________________________ Pin Description PIN NAME FUNCTION 1 CS Active-Low Chip Select Input. Used to select or deselect the device. 2, 7–14 N.C. No Connection. Not connected internally. Must be connected to ground. 3 32kHz 32kHz Push-Pull Output. If disabled with either EN32kHz = 0 or BB32kHz = 0, the state of the 32kHz pin will be low. 4VCC DC Power Pin for Primary Power Supply. This pin should be decoupled using a 0.1µF to 1.0µF capacitor. 5 INT/SQW Active-Low Interrupt or Square-Wave Output. This open-drain pin requires an external pullup resistor. It can be left open if not used. This multifunction pin is determined by the state of the INTCN bit in the Control Register (0Eh). When INTCN is set to logic 0, this pin outputs a square wave and its frequency is determined by RS2 and RS1 bits. When INTCN is set to logic 1, then a match between the timekeeping registers and either of the alarm registers activates the INT/SQW pin (if the alarm is enabled). Because the INTCN bit is set to logic 1 when power is first applied, the pin defaults to an interrupt output with alarms disabled. 6 RST Active-Low Reset. This pin is an open-drain input/output. It indicates the status of VCC relative to the VPF specification. As VCC falls below VPF, the RST pin is driven low. When VCC exceeds VPF, for tRST, the RST pin is driven high impedance. The active-low, open-drain output is combined with a debounced pushbutton input function. This pin can be activated by a pushbutton reset request. It has an internal 50kΩ nominal value pullup resistor to VCC. No external pullup resistors should be connected. If the crystal oscillator is disabled, tRST is bypassed and RST immediately goes high. 15 GND Ground 16 VBAT Backup Power-Supply Input. If VBAT is not used, connect to ground. Diodes placed in series between the VBAT pin and the battery can cause improper operation. UL recognized to ensure against reverse charging when used with a lithium battery. Go to www.maxim-ic.com/qa/info/ul. 17 DIN SPI Data Input. Used to shift address and data into the device. 18, 20 SCLK SPI Clock Input. Used to control timing of data into and out of the device. Either clock polarity can be used. The clock polarity is determined by the device based on the state of SCLK when CS goes low. Pins 18 and 20 are electrically connected together internally. 19 DOUT SPI Data Output. Data is output on this pin when the device is in read mode; CMOS push-pull driver. |
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