PDF DS2415 Data sheet ( Hoja de datos )

Número de pieza	DS2415
Descripción	1-Wire Time Chip
Fabricantes	Dallas Semiconducotr
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No Preview Available ! DS2415 1-Wire Time Chip www.maxim-ic.com FEATURES § Real-time clock with fully compatible 1- Wire® MicroLAN interface § Uses the same binary time/date representation as the DS2404 but with 1 second resolution § Clock accuracy ±2 minutes per month at 25°C § Communicates at 16.3kbits per second § Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48- bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike § 8-bit family code specifies device communication requirements to bus master § Built-in multidrop controller ensures compatibility with other MicroLAN products § Operates over a wide VDD voltage range of 2.5V to 5.5V from -40°C to +85°C § Low power, 200nA typically with oscillator running § Compact, low cost 6-pin TSOC surface mount package PIN ASSIGNMENT 6-Pin TSOC PACKAGE TOP VIEW PIN DESCRIPTION Pin 1 - GND Pin 2 - 1-Wire Pin 3 Pin 4 - VDD - VBAT Pin 5 - X1 Pin 6 - X2 ORDERING INFORMATION DS2415P 6-pin TSOC package DS2415P/T&R Tape & Reel of DS2415P DS2415X Chip Scale Pkg., Tape & Reel DESCRIPTION The DS2415 1-Wire time chip offers a simple solution for storing and retrieving vital time information with minimal hardware. The DS2415 contains a unique, lasered ROM and a real-time clock/calendar implemented as a binary counter. Only one pin is required for communication with the device. Utilizing a backup energy source, the data is nonvolatile and allows for stand-alone operation. The DS2415 features can be used to add functions such as calendar, time and date stamp, and logbook to any type of electronic device or embedded application that uses a microcontroller. OVERVIEW The DS2415 has two main data components: 1) 64-bit lasered ROM, and 2) real-time clock counter (Figure 1). The real-time clock utilizes an on-chip oscillator that is connected to an external 32.768kHz crystal. All data is read and written least significant bit first. The real-time clock functions will not be 1 of 14 112701 1 page DS2415 READ CLOCK [66h] The Read Clock command is used to read the device control byte and the contents of the real-time clock counter. After having received the most significant bit of the command code the device copies the actual contents of the real-time clock counter to the read/write buffer. Now the bus master reads data beginning with the device control byte followed by the least significant byte through the most significant byte of the real-time clock. After this the bus master may continue reading from the DS2415. The data received will be the same as in the first pass through the command flow. The Read Clock command can be ended at any point by issuing a Reset Pulse. WRITE CLOCK [99h] The Write Clock command is used to set the real-time clock counter and to write the device control byte. After issuing the command, the bus master writes first the device control byte, which becomes immediately effective. After this the bus master sends the least significant byte through the most significant byte to be written to the real time clock counter. The new time data is copied from the read/write buffer to the real time clock counter and becomes effective as the bus master generates a Reset Pulse. If the oscillator is intentionally stopped the real time clock counter behaves as a 4-byte nonvolatile memory. 5 of 14 5 Page READ/WRITE TIMING DIAGRAM Figure 9 Write-1 Time Slot Write-0 Time Slot 60ms £ tSLOT < 120ms 1ms £ tLOW1 < 15ms 1ms £ tREC < ¥ DS2415 60ms £ tLOW0 < tSLOT < 120ms 1ms £ tREC < ¥ 11 of 14 11 Page

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