PCF8564ACX9/B/1,02 NXP Semiconductors, PCF8564ACX9/B/1,02 Datasheet - Page 12

• Manufacturer Part Number: PCF8564ACX9/B/1,02
• Description: IC RTC/CALENDAR
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF8564ACX9/B/1,02

• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: Die
• Function: Serial Clock, Alarm, Calendar, Timer, Timer Interrupt
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1 V
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C
• Supply Current: 1700 nA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: 568-6424-2; PCF8564ACX9/B/1,02

NXP Semiconductors
PCF8564A
Product data sheet
8.4.7 Register Years
8.5 Setting and reading the time
Table 17.
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The PCF8564A compensates for leap years by adding a 29th day to February if the year
counter contains a value which is divisible by 4, including the year 00.
Figure 6
During read/write operations, the time counting circuits (memory locations 02h through
08h) are blocked.
This prevents
After this read/write access is completed, the time circuit is released again and any
pending request to increment the time counters, that occurred during the read access, is
serviced. A maximum of 1 request can be stored; therefore, all accesses must be
completed within 1 second (see
Bit
7 to 4 YEARS
3 to 0
Fig 6.
•
•
When the register Years overflows from 99 to 00, the century bit C in the register Months is toggled.
Faulty writing or reading of the clock and calendar during a carry condition
Incrementing the time registers, during the read cycle
Symbol
shows the data flow and data dependencies starting from the 1 Hz clock tick.
Data flow for the time function
Years - years register (08h) bit description
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 30 September 2010
LEAP YEAR
CALCULATION
Value
0 to 9
0 to 9
Figure
Place value Description
ten’s place
unit place
7).
SECONDS
MINUTES
MONTHS
1 Hz tick
HOURS
YEARS
DAYS
C
actual year coded in BCD format
WEEKDAY
Real time clock and calendar
013aaa092
PCF8564A
© NXP B.V. 2010. All rights reserved.
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