PCF8564ACX9/1,005 NXP Semiconductors, PCF8564ACX9/1,005 Datasheet - Page 13

• Manufacturer Part Number: PCF8564ACX9/1,005
• Description: IC RTC/CALENDAR I2C 9BUMP
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF8564ACX9/1,005

• 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: 568-6640; PCF8564ACX9/1,005

NXP Semiconductors
PCF8564A
Product data sheet
8.6.1 Register Minute_alarm
8.6 Alarm registers
As a consequence of this method, it is very important to make a read or write access in
one go, that is, setting or reading seconds through to years should be made in one single
access. Failing to comply with this method could result in the time becoming corrupted.
As an example, if the time (seconds through to hours) is set in one access and then in a
second access the date is set, it is possible that the time may increment between the two
accesses. A similar problem exists when reading. A roll over may occur between reads
thus giving the minutes from one moment and the hours from the next.
Recommended method for reading the time:
10. Read the century and month.
11. Read the years.
12. Send a STOP condition.
Table 18.
[1]
Bit
7
6 to 4 MINUTE_ALARM
3 to 0
1. Send a START condition and the slave address for write (A2h).
2. Set the address pointer to 2 (seconds) by sending 02h.
3. Send a RE-START condition or STOP followed by START.
4. Send the slave address for read (A3h).
5. Read the seconds.
6. Read the minutes.
7. Read the hours.
8. Read the days.
9. Read the weekdays.
Fig 7.
Default value.
Symbol
AE_M
Access time for read/write operations
Minute_alarm - minute alarm register (address 09h) bit description
START
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 30 September 2010
SLAVE ADDRESS
Value
0
1
0 to 5
0 to 9
[1]
Place value Description
-
-
ten’s place
unit place
DATA
minute alarm is enabled
minute alarm is disabled
minute alarm information coded in BCD
format
DATA
t < 1 s
Real time clock and calendar
PCF8564A
STOP
© NXP B.V. 2010. All rights reserved.
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