PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 29
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PCF2127AT/1,518
Manufacturer Part Number
PCF2127AT/1,518
Description
IC RTC/CALENDAR TCXO QTZ 20SOIC
Manufacturer
NXP Semiconductors
Type
Clock/Calendar/Alarmr
Datasheet
1.PCF2127AT1518.pdf
(80 pages)
Specifications of PCF2127AT/1,518
Package / Case
20-SOIC (0.300", 7.50mm Width)
Time Format
HH:MM:SS (12/24 hr)
Memory Size
512B
Date Format
YY-MM-DD-dd
Interface
I²C, 2-Wire Serial
Voltage - Supply
1.8 V ~ 4.2 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Function
Serial Clock, Timestamp, Timekeeper, Watchdog, Alarm, Calendar, Timer, Timer Interrupt
Rtc Memory Size
512 bytes
Supply Voltage (max)
4.2 V
Supply Voltage (min)
1.8 V
Mounting Style
SMD/SMT
Rtc Bus Interface
I2C
Supply Current
2600 nA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
NXP Semiconductors
PCF2127A_2
Product data sheet
8.9.3 Register Hours
8.9.4 Register Days
8.9.5 Register Weekdays
Table 22.
[1]
Table 23.
[1]
Table 24.
Although the association of the weekdays counter to the actual weekday is arbitrary, the
PCF2127A will assume Sunday is 000 and Monday is 001 for the purposes of determining
the increment for calendar weeks.
Table 25.
[1]
Bit
7 to 6 -
12 hour mode
5
4
3 to 0
24 hour mode
5 to 4 HOURS
3 to 0
Bit
7 to 6 -
5 to 4 DAYS
3 to 0
Bit
7 to 3 -
2 to 0 WEEKDAYS
Day
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Hour mode is set by the bit 12_24 in register Control_1.
The RTC compensates for leap years by adding a 29
which is exactly divisible by 4, including the year 00.
These bits may be re-assigned by the user.
[1]
Symbol
AMPM
HOURS
Symbol
Symbol
Hours - hours register (address 05h) bit description
Days - days register (address 06h) bit description
Weekdays - weekdays register (address 07h) bit description
Weekday assignments
[1]
[1]
[1]
All information provided in this document is subject to legal disclaimers.
Bit
2
0
0
0
0
1
1
1
Rev. 02 — 7 May 2010
Value
-
0
1
0 to 1
0 to 9
0 to 2
0 to 9
Value
-
0 to 3
0 to 9
Value
-
0 to 6
Description
unused
actual weekday value, see
Place value Description
-
-
-
ten’s place
unit place
ten’s place
unit place
Place value Description
-
ten’s place
unit place
1
0
0
1
1
0
0
1
Integrated RTC, TCXO and quartz crystal
th
day to February if the year counter contains a value
unused
indicates AM
indicates PM
actual hours coded in BCD format when in
12 hour mode
actual hours coded in BCD format when in
24 hour mode
unused
actual day coded in BCD format
Table 25
PCF2127A
0
0
1
0
1
0
1
0
© NXP B.V. 2010. All rights reserved.
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