DS1743/DS1743P

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CLOCK ACCURACY (DIP MODULE)

The DS1743 is guaranteed to keep time accuracy to within

±1 minute per month at 25°C. The RTC is

calibrated at the factory by Dallas Semiconductor using nonvolatile tuning elements, and does not require

additional For this reason, methods of field clock calibration are not available and not necessary.

Clock

accuracy is also effected by the electrical environment and caution should be taken to place the RTC in the

lowest level EMI section of the PCB layout. For additional information please see application note 58.

CLOCK ACCURACY (POWERCAP MODULE)

The DS1743 and DS9034PCX are each individually tested for accuracy. Once mounted together, the

module will typically keep time accuracy to within

±1.53 minutes per month (35 ppm) at 25°C. Clock

accuracy is also effected by the electrical environment and caution should be taken to place the RTC in the

lowest level EMI section of the PCB layout. For additional information please see application note 58.

DS1743 REGISTER MAP Table 2

DATA

ADDRESS

FUNCTION/RANGE

1FFF

10 Year

YEAR

YEAR

00-99

1FFE

X

X

X

10 Mo

MONTH

MONTH

01-12

1FFD

X

X

10 Date

DATE

DATE

01-31

1FFC

BF

FT

X

X

X

DAY

DAY

01-07

1FFB

X

X

10 HOUR

HOUR

HOUR

00-23

1FFA

X

10 MINUTES

MINUTES

MINUTES

00-59

1FF9

OSC

10 SECONDS

SECONDS

SECONDS

00-59

1FF8

W

R

10 CENTURY

CENTURY

CONTROL

00-39

OSC

= STOP BIT

R = READ BIT

FT = FREQUENCY TEST

W = WRITE BIT

X = SEE NOTE BELOW

BF = BATTERY FLAG

NOTE:

All indicated “X” bits are not dedicated to any particular function and can be used as normal RAM bits.

RETRIEVING DATA FROM RAM OR CLOCK

(chip enable) is low. The device architecture allows ripple-through access to any of the address locations