DS14287 Maxim Integrated Products, DS14287 Datasheet - Page 10
![IC RTC W/NV RAM CNTRL 24-EDIP](/photos/28/17/281725/24-dip-600mil_pkg_sml.jpg)
DS14287
Manufacturer Part Number
DS14287
Description
IC RTC W/NV RAM CNTRL 24-EDIP
Manufacturer
Maxim Integrated Products
Type
Clock/Calendar/NVSRAMr
Datasheet
1.DS14285Q.pdf
(26 pages)
Specifications of DS14287
Memory Size
114B
Time Format
HH:MM:SS (12/24 hr)
Date Format
YY-MM-DD-dd
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
24-DIP (600 mil) Module
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS14287
Manufacturer:
DALLAS
Quantity:
400
Company:
Part Number:
DS14287
Manufacturer:
DALLAS
Quantity:
400
Part Number:
DS14287
Manufacturer:
DALLAS
Quantity:
20 000
DS14285/DS14287
CONTROL REGISTERS
The DS14285/DS14287 has four control registers that are accessible at all times, even during the update
cycle.
REGISTER A
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
UIP
DV2
DV1
DV0
RS3
RS2
RS1
RS0
UIP - The Update In Progress (UIP) bit is a status flag that can be monitored. When the UIP bit is a 1, the
update transfer will soon occur. When UIP is a 0, the update transfer will not occur for at least 244 µs.
The time, calendar, and alarm information in RAM is fully available for access when the UIP bit is 0. The
UIP bit is read-only and is not affected by
. Writing the SET bit in Register B to a 1 inhibits any
RESET
update transfer and clears the UIP status bit.
DV0, DV1, DV2 - These 3 bits are used to turn the oscillator on or off and to reset the countdown chain.
A pattern of 010 is the only combination of bits that will turn the oscillator on and allow the RTC to keep
time. A pattern of 11X will enable the oscillator but holds the countdown chain in reset. The next update
will occur at 500 ms after a pattern of 010 is written to DV0, DV1, and DV2.
RS3, RS2, RS1, RS0 - These four rate-selection bits select one of the 13 taps on the 15-stage divider or
disable the divider output. The tap selected can be used to generate an output square wave (SQW pin)
and/or a periodic interrupt. The user can do one of the following:
1. Enable the interrupt with the PIE bit;
2. Enable the SQW output pin with the SQWE bit;
3. Enable both at the same time and the same rate; or
4. Enable neither.
Table 2 lists the periodic interrupt rates and the square wave frequencies that can be chosen with the RS
bits. These 4 read/write bits are not affected by
.
RESET
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