PCA2125TS/1,112 NXP Semiconductors, PCA2125TS/1,112 Datasheet - Page 18

• Manufacturer Part Number: PCA2125TS/1,112
• Description: IC CMOS RTC/CALENDAR 14-TSSOP
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCA2125TS/1,112

• Package / Case: 14-TSSOP
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 1.3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Function: Clock, Calendar
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: OM6292 - DEMO BOARD PCA2125 RTC
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 935283386112; PCA2125TS/1; PCA2125TS/1

NXP Semiconductors
PCA2125_1
Product data sheet
Fig 11. Interrupt scheme
COUNTDOWN COUNTER
When bits SI, MI, TIE and AIE are all disabled, pin INT will remain high-impedance.
SECONDS COUNTER
MINUTES COUNTER
8.7.1 Minute and second interrupts
TE
Remark: Note that the interrupts from the three groups are wired-OR, meaning they will
mask one another; see
The pulse generator for the minute/second interrupt operates from an internal 64 Hz clock
and consequently generates a pulse of
If the MSF flag is clear before the end of the INT pulse, then the INT pulse is shortened.
This allows the source of a system interrupt to be cleared immediately it is serviced i.e.
the system does not have to wait for the completion of the pulse before continuing; see
Figure
from interface:
from interface:
from interface:
12. Instructions for clearing MSF are given in
clear MSF
set alarm
clear AF
clear TF
flag, AF
MI
SI
SET
SET
SET
SECOND FLAG
MSF: MINUTE
AF: ALARM
TF: TIMER
CLEAR
CLEAR
CLEAR
Rev. 01 — 28 July 2008
Figure
FLAG
11.
TRIGGER
TRIGGER
GENERATOR 1
GENERATOR 2
1
PULSE
CLEAR
PULSE
CLEAR
to interface:
read MSF
to interface:
read TF
to interface:
read AF
64
second duration.
TI_TP
Section
0
1
0
1
SPI Real-time clock/calendar
8.6.3.
SI
AIE
TIE
MI
PCA2125
© NXP B.V. 2008. All rights reserved.
001aaf907
INT
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