PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 17

• Manufacturer Part Number: PCF2127AT/1,518
• Description: IC RTC/CALENDAR TCXO QTZ 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

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.
DD
DD
);
);
17 of 80
DD
;