PDF DS2417 Data sheet ( Hoja de datos )

Número de pieza	DS2417
Descripción	1-Wire Time Chip
Fabricantes	Maxim Integrated
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DS2417 1-Wire Time Chip with Interrupt FEATURES  Real-time clock (RTC) 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  Programmable interrupt output for system wakeup  Communicates at 16.3kbits per second  Unique, factory-lasered and tested 64-bit reg- istration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures ab- solute traceability because no two parts are alike  8-bit family code specifies device communi- cation requirements to bus master  Built-in multidrop controller ensures com- patibility 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 and Flip-Chip surface mount package PIN ASSIGNMENT 16 25 34 TSOC 150 mil Top view 65 4 DS2417 rrd#xx 12 3 Flip Chip, Top View with Laser Mark, Contacts Not Visible. “rrd” = Revision/Date #xx = Lot Number PIN DESCRIPTION Pin 1 GND Pin 2 1-Wire Pin 3 INT Pin 4 VDD Pin 5 X1 Pin 6 X2 ORDERING INFORMATION DS2417P 6-pin TSOC package DS2417P/T&R TSOC Package, Tape & Reel DS2417P+ 6-pin TSOC Package DS2417P+T&R TSOC Package, Tape & Reel DS2417X Flip-Chip, 10k Tape & Reel + Denotes a lead(Pb)-free/RoHS-compliant package. DESCRIPTION The DS2417 1-Wire Time Chip with Interrupt offers a simple solution for storing and retrieving vital time information with minimal hardware. The DS2417 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 DS2417 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. 1 of 15 19-8222; Rev 2; 3/16 1 page Bit 4 - 6 IS Interval Select These bits determine the time between interrupt pulses. The values available are shown below. IS2 IS1 IS0 Interrupt Interval 0 0 0 1s 0 0 1 4s 0 1 0 32s = 0.53 min. 0 1 1 64s = 1.07 min. 1 0 0 2048s = 34.13 min. 1 0 1 4096s = 68.27 min. 1 1 0 65536s = 18.20 hours 1 1 1 131072s = 36.41 hours DS2417 Bit 7 IE Interrupt Enable This bit controls whether the interrupt pulse will be generated at the selected interval. To enable interrupts this bit needs to be 1. REAL-TIME CLOCK The real-time clock is a 32-bit binary counter. It is incremented once per second. The real-time clock can accumulate 136 years of seconds before rolling over. Time/date is represented by the number of seconds since a reference point, which is determined by the user. For example, 12:00 a.m., January 1, 1970 could be a reference point. CLOCK FUNCTION COMMANDS The “Clock Function Flow Chart” (Figure 5) describes the protocols necessary for accessing the real-time clock. With only four bytes of real-time clock and one control byte the DS2417 does not provide random access. Reading and writing always starts with the device control byte followed by the least significant byte of the time data. 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 DS2417. 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 enabled, an interrupt pulse will be generated either immediately or delayed, depending on the actual time and the selected interval duration (see Figure 11). If the oscillator is intentionally stopped the real-time clock counter behaves as a four-byte nonvolatile memory. Page 5 of 15 5 Page READ/WRITE TIMING DIAGRAM Figure 9 Write-one Time Slot VPULLUP VPULLUP MIN VIH MIN VIL MAX 0V tSLOT DS2417 Sampling Window tLOW1 15µs (OD: 2µs) (OD: 6µs) 60µs RESISTOR MASTER Write-zero Time Slot VPULLUP VPULLUP MIN VIH MIN VIL MAX 0V RESISTOR MASTER 60 µs ≤ tSLOT < 120 µs 1 µs ≤ tLOW1 < 15 µs 1 µs ≤ tREC < ∞ tSLOT DS2417 Sampling Window 15µs (OD: 2µs) (OD: 6µs) 60µs t LOW 0 60 µs ≤ tLOW0 < tSLOT < 120 µs 1 µs ≤ tREC < ∞ tREC tREC DS2417 Page 11 of 15 11 Page

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