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DS1391U-33+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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DS1391U-33+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 25 page Low-Voltage SPI/3-Wire RTCs with Trickle Charger 10 ____________________________________________________________________ Pin Description PIN DS1390 DS1391 DS1392 DS1393 NAME FUNCTION 1 1 1 1 X1 2 2 2 2 X2 Connections for Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for operation with a crystal having a 6pF specified load capacitance (CL). Pin X1 is the input to the oscillator and can optionally be connected to an external 32.768kHz oscillator. The output of the internal oscillator, pin X2, is floated if an external oscillator is connected to pin X1. 3 3 3 3 VBACKUP DC Backup Power Input for Primary Cell. This pin is a rechargeable battery/super cap or a secondary supply. UL recognized to ensure against reverse charging current when used with a lithium battery (www.maxim- ic.com/qa/info/w/). This pin must be grounded if not used. Diodes in series between the battery and the VBACKUP pin may prevent proper operation. 4 4 — — CS SPI Chip-Select Input. This pin is used to select or deselect the part. — — 4 4 CE Chip Enable for 3-Wire Interface 5 5 5 5 GND Ground 6 6 — — DIN SPI Data Input. This pin is used to shift address and data into the part. — — 6 — INT Interrupt Output. This pin is used to output the interrupt signal, if enabled by the control register. The maximum voltage on this pin is 5.5V, independent of VCC or VBACKUP. If enabled, INT functions when the device is powered by either VCC or VBACKUP. — 9 — 6 RST Reset. This active-low, open-drain output 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. This pin is combined with a debounced pushbutton input function. This pin can be activated by a pushbutton reset request. This pin has an internal, 50k (typ) pullup resistor to VCC. No external pullup resistors should be connected. If the crystal oscillator is disabled, the startup time of the oscillator is added to the tRST delay. 7 7 — — DOUT SPI Data Output. Data is output on this pin when the part is in read mode. CMOS push-pull driver. — — 7 7 I/O Input/Output for 3-Wire Interface. CMOS push-pull driver. 8 8 8 8 SCLK Serial Clock Input. This pin is used to control the timing of data into and out of the part. 9 — — 9 SQW/ INT Square-Wave/Interrupt Output. This pin is used to output the programmable square wave or interrupt signal. When enabled by setting the ESQW bit to logic 1, the SQW/ INT pin outputs one of four frequencies: 32.768kHz, 8.192kHz, 4.096kHz, or 1Hz. This pin is open drain and requires an external pullup resistor. The maximum voltage on this pin is 5.5V, independent of VCC or VBACKUP. If enabled, SQW/ INT functions when the device is powered by either VCC or VBACKUP. — — 9 — SQW Square-Wave Output. This pin is open drain and requires an external pullup resistor. The maximum voltage on this pin is 5.5V, independent of VCC or VBACKUP. If enabled, SQW functions when the device is powered by either VCC or VBACKUP. 10 10 10 10 VCC DC Power Pin for Primary Power Supply |
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Similar Description - DS1391U-33+ |
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