how to put a better RTC for a Controller Ckt

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binu G

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hi
iam looking for making a external RTC for the rabbit 3000 microprocessor
can any one suggest

binu g
 

When I need RTC I always use PCF8583.

Its i2c interface RTC, with 240Bytes of internal RAM witch can be used as well and this 240 bytes are battery supported.

Mr.Cube
 

Hi,

Look for DS1340


♦ Enhanced Second Source for the ST M41T00
♦ Fast (400kHz) 2-Wire (I2C) Interface
♦ Software Clock Calibration
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
♦ Automatic Power-Fail Detect and Switch Circuitry
♦ Trickle-Charge Capability
♦ Low Timekeeping Voltage Down to 1.3V
♦ Three Operating Voltage Ranges (1.8V, 3V, and
3.3V)
♦ Oscillator Stop Flag
♦ Available in 8-Pin µSOP or SO Packages

BYe
 

If you need a very simple RTC, without internal RAM or EEPROM or other collateral features, you can use HT1381 (look at https://www.holtek.com for the datasheet) which has a very low price. It has a 3 wire interface with the MCU and should be connected to a 32.768KHz crystal and power supply (supercap, lithium battery, ...).
Also, somewhere in this forum you can find the C routines I use with that RTC.
Bye. Paolo
 

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