PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 17
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PCF2127AT/1,518
Manufacturer Part Number
PCF2127AT/1,518
Description
IC RTC/CALENDAR TCXO QTZ 20SOIC
Manufacturer
NXP Semiconductors
Type
Clock/Calendar/Alarmr
Datasheet
1.PCF2127AT1518.pdf
(80 pages)
Specifications of PCF2127AT/1,518
Package / Case
20-SOIC (0.300", 7.50mm Width)
Time Format
HH:MM:SS (12/24 hr)
Memory Size
512B
Date Format
YY-MM-DD-dd
Interface
I²C, 2-Wire Serial
Voltage - Supply
1.8 V ~ 4.2 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Function
Serial Clock, Timestamp, Timekeeper, Watchdog, Alarm, Calendar, Timer, Timer Interrupt
Rtc Memory Size
512 bytes
Supply Voltage (max)
4.2 V
Supply Voltage (min)
1.8 V
Mounting Style
SMD/SMT
Rtc Bus Interface
I2C
Supply Current
2600 nA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
NXP Semiconductors
PCF2127A_2
Product data sheet
8.6 Power management functions
The PCF2127A has two power supply pins and one power output pin:
The PCF2127A has three power management functions implemented:
The power management functions are controlled by the control bits PWRMNG[2:0] in
register Control_3:
Table 17.
[1]
[2]
PWRMNG[2:0]
000
001
010
011
100
101
110
111
•
•
•
•
•
•
V
V
BBS - battery backed output voltage pin (equal to the internal power supply)
Battery switch-over function
Battery low detection function
Extra power fail detection function
Default value.
When the battery switch-over function is disabled, the PCF2127A works only with the power supply V
V
BAT
DD
BAT
must be put to ground and the battery low detection function is disabled.
- the main power supply input pin
- the battery backup input pin
Power management control bit description
All information provided in this document is subject to legal disclaimers.
[1]
[2]
[2]
Function
battery switch-over function is enabled in standard mode;
battery low detection function is enabled;
extra power fail detection function is enabled
battery switch-over function is enabled in standard mode;
battery low detection function is disabled;
extra power fail detection function is enabled
battery switch-over function is enabled in standard mode;
battery low detection function is disabled;
extra power fail detection function is disabled
battery switch-over function is enabled in direct switching mode;
battery low detection function is enabled;
extra power fail detection function is enabled
battery switch-over function is enabled in direct switching mode;
battery low detection function is disabled;
extra power fail detection function is enabled
battery switch-over function is enabled in direct switching mode;
battery low detection function is disabled;
extra power fail detection function is disabled
battery switch-over function is disabled - only one power supply (V
battery low detection function is disabled;
extra power fail detection function is enabled
battery switch-over function is disabled - only one power supply (V
battery low detection function is disabled;
extra power fail detection function is disabled
Rev. 02 — 7 May 2010
Integrated RTC, TCXO and quartz crystal
PCF2127A
© NXP B.V. 2010. All rights reserved.
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