PCF2129AT/1,512 NXP Semiconductors, PCF2129AT/1,512 Datasheet - Page 38

• Manufacturer Part Number: PCF2129AT/1,512
• Description: IC REAL TIME CLK/CALENDAR 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2129AT/1,512

• Package / Case: 20-SOIC (7.5mm Width)
• Date Format: YY-MM-DD-dd
• Time Format: HH:MM:SS (12/24 hr)
• Interface: I²C, SPI
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Clock, Alarm, Watchdog, Timestamp
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C, SPI
• Supply Current: 800 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-4960-5; 935288599512

NXP Semiconductors
PCF2129A_2
Product data sheet
Fig 19. Interrupt block diagram
When SI, MI, WD_CD, AIE, TSIE, BIE, BLIE are all disabled, INT will remain high-impedance.
SECONDS COUNTER
MINUTES COUNTER
8.12 Interrupt output, INT
watchdog counter
PCF2129A has an interrupt output pin INT which is open-drain, active LOW. Interrupts
may be sourced from different places:
circuit: clear BF
•
•
•
•
•
•
WATCHDOG
from interface:
from interface:
from interface:
set timestamp
from interface:
WD_CD = 1
COUNTER
low detection
MCU loading
low flag, BLF
from battery
second or minute timer
watchdog timer
alarm
timestamp
battery switch-over
battery low detection
set battery
set battery
flag, TSFx
clear MSF
clear TSF
set alarm
clear AF
clear BF
flag, AF
flag, BF
MI
SI
All information provided in this document is subject to legal disclaimers.
SET
SET
SET
SET
SET
TSFx: TIMESTAMP
BLF: BATTERY
SET
BF: BATTERY
SECOND FLAG
TIMER FLAG
WATCHDOG
AF: ALARM
LOW FLAG
WDTF:
CLEAR
CLEAR
CLEAR
CLEAR
CLEAR
MINUTE
FLAG
FLAG
FLAG
CLEAR
MSF:
Rev. 02 — 7 May 2010
TRIGGER
GENERATOR 1
to interface:
read MSF
to interface:
read WD_CD
to interface:
read AF
to interface:
read TSFx
to interface:
read BF
to interface:
read BLF
PULSE
CLEAR
Integrated RTC, TCXO and quartz crystal
0
1
TI_TP
WD_CD = 0
SI/MI
TSIE
BLIE
AIE
BIE
PCF2129A
001aaj399
© NXP B.V. 2010. All rights reserved.
INT pin
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