PCF8564ACX9/B/1,02 NXP Semiconductors, PCF8564ACX9/B/1,02 Datasheet - Page 24

• 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
Fig 18. Master reads word after setting word address (write word address; READ data)
S
SLAVE ADDRESS
10.3 Interface watchdog timer
During read/write operations, the time counting circuits are frozen. To prevent a situation
where the accessing device becomes locked and does not clear the interface, the
PCF8564A has a built in watchdog timer. Should the interface be active for more than 1 s
from the time a valid slave address is transmitted, then the PCF8564A will automatically
clear the interface and allow the time counting circuits to continue counting.
The watchdog is implemented to prevent the excessive loss of time due to interface
access failure e.g. if main power is removed from a battery backed-up system during an
interface access.
Each time the watchdog period is exceeded, 1 s will be lost from the time counters. The
watchdog will trigger between 1 s and 2 s after receiving a valid slave address.
acknowledgement
Fig 19. Master reads slave immediately after first byte (READ mode)
R/W
from slave
0 A
S
WORD ADDRESS
SLAVE ADDRESS
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 30 September 2010
at this moment master transmitter
acknowledgement
becomes master receiver and
from slave
becomes slave transmitter
acknowledgement
PCF8564A slave receiver
A
R/W
from slave
1 A
S
SLAVE ADDRESS
n bytes
DATA
acknowledgement
auto increment
acknowledgement
word address
R/W
from master
from slave
1
A
A
Real time clock and calendar
n bytes
last byte
DATA
DATA
last byte
DATA
memory word address
no acknowledgement
auto increment
acknowledgement
PCF8564A
memory word address
auto increment
word address
no acknowledgement
from master
from master
auto increment
© NXP B.V. 2010. All rights reserved.
from master
A
1
mgl665
1
013aaa034
P
P
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