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DS1305 Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS1305 Datasheet(HTML) 4 Page - Dallas Semiconductor |
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4 / 21 page  DS1305 4 of 21 PIN DESCRIPTIONS (continued) PIN DIP TSSOP NAME FUNCTION 12 15 SDI Serial Data Input. When SPI communication is selected, the SDI pin is the serial data input for the SPI bus. When 3-wire communication is selected, this pin must be tied to the SDO pin (the SDI and SDO pins function as a single I/O pin when tied together). 13 16 SDO Serial Data Output. When SPI communication is selected, the SDO pin is the serial data output for the SPI bus. When 3-wire communication is selected, this pin must be tied to the SDI pin (the SDI and SDO pins function as a single I/O pin when tied together). 14 17 VCCIF Interface Logic Power-Supply Input. The VCCIF pin allows the DS1305 to drive SDO and PF output pins to a level that is compatible with the interface logic, thus allowing an easy interface to 3V logic in mixed supply systems. This pin is physically connected to the source connection of the p-channel transistors in the output buffers of the SDO and PF pins. 15 18 PF Active-Low Power-Fail Output. The PF pin is used to indicate loss of the primary power supply (VCC1). When VCC1 is less than VCC2 or is less than VBAT, the PF pin is driven low. 16 20 VCC1 Primary Power Supply. DC power is provided to the device on this pin. OPERATION The block diagram in Figure 1 shows the main elements of the serial alarm RTC. The following paragraphs describe the function of each pin. Figure 1. BLOCK DIAGRAM 1Hz OSCILLATOR AND COUNTDOWN CHAIN |
Similar Part No. - DS1305_05 |
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Similar Description - DS1305_05 |
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