DS1305 DATASHEET PDF

DSE. Pin TSSOP. DSEN Pin TSSOP (Industrial). PIN ASSIGNMENT. DS Serial Alarm Real Time Clock (RTC) VCC2. 1. DS Maxim Integrated Real Time Clock Serial Alarm RTC 3-Wire datasheet, inventory, & pricing. Maxim Integrated DS+: available from 18 distributors. Explore Integrated Circuits (ICs) on Octopart: the fastest source for datasheets, pricing, specs.

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Each alarm can generate an interruptof the DS Values that correspond to the day of week are user-defined but must be sequential e. If dataasheet used, VBAT must be connect to ground. Only these three configurations are allowed. This is what I have: T heDS When this bit is set to a logic 1, the oscillator is stopped and the DS is placed into a low-power standby mode with a current drain of less than nA when power is supplied by VBAT or VCC2.

Each alarm can generate an interrupt on acharacteristics of the DS Real-time clock counts seconds, minutes, hours, date, month, day, year, and leap year to The DS can also be driven by an external However, the countdown chain is reset when the seconds register is written.

Still some fixing up remaining, to ensure that it always calculates the time and date fields correctly conforming to the datasheet.

This application note describes how to interface a DS real-time clock with the DS, an. Also note that registers 12h to 1Fh read and registers 92h to 9Fh are reserved.

Dallas Semiconductor – datasheet pdf

The DS can be dataeheet in either hour or hour mode. The following paragraphs describe the function of each pin. Pin Description Pin Number Description 1. An alarm is generated every day when bit 7 of the day alarm register is set to a logic 1. The INT1 pin is an open-drain ds13005 and requires an external pullup resistor. I have found a library for the DS which uses the SPI mode, so that one should have the logic down for controlling time and alarm registers.

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The day register increments at midnight.

DS Datasheet(PDF) – Dallas Semiconductor

Time-of-day Alarm 0 can be set by writing to registers 87h to 8Ah. Ground Serial Interface Mode. The DS contains two time-of-day alarms.

When connected to GND, standard 3-wire datashret is selected. This pin is physically connected to the source connection of the p-channel transistors in the output buffers of the Ds3105 and PF pins. Underwriters Laboratory UL Recognized. These bits always read 0 regardless of how they are written. Time-of-day Alarm 1 can be set by writing to registers 8Bh to 8Eh. After the address, one or more data bytes can be written or read.

The dual power supplies support a programmable trickle charge circuit that allows a rechargeable energy source such as a super cap or rechargeable battery to be used for a backup supply. Two programmable time of day alarms are provided by the DS This pin has an internal 55k? From a quick overlook of the code I’d guess that changing the defines: Configuration 2 illustrates the DS being backed up by a rechargeable energy source. The chip-enable signal must be asserted high during a read or a write for both 3-wire and SPI communication.

The chip supports both modes.

Dallas Semiconductor

These registers always read 0 regardless of how they are written. When bit 7 of the day, hour, minute, and seconds alarm registers is set to a logic 1, alarm occurs every second. Photograph Features Real-time clock counts seconds, minutes, hours, dx1305, month, day, year, and leap year to byte, battery-backed, nonvolatile Ds105 RAM for data storage Two time of day Alarms Serial interface SPI or standard 3-wire interface Dual-power supply pins for primary and backup power supplies Optional trickle charge output to Backup Supply Underwriters Laboratory UL Recognized.

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Interface Logic Power-Supply Input. The VBAT pin allows the device to be backed up by a non-rechargeable battery. I basically need to know if this is a feasible way to go, before I go waste a lot of hours trying to get it to not work. When a match occurs, the corresponding alarm flag da1305 in the status register is set to a 1.

dz1305 The INT0 pin is an open-drain output and requires an external pullup resistor. In the hour mode, bit 5 is the second hour bit 20 to 23 hours. Active-Low Interrupt 1 Output. Datashete end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year.

In this configuration, the X1 pin is connected to de1305 external oscillator signal and the X2 pin is floated. Each alarm can generate an interrupt on a. The two interrupts and the internal clock continue to run regardless of the level of VCC as long as a power source is present. IRQF0 is cleared when the address pointer goes to any of the Alarm 0 registers during a read or write.

Upon initial power-up, the state of the WP bit is undefined. To prevent accidental enabling, only a pattern of enables the trickle charger.