PCF2127AT/1 NXP [NXP Semiconductors], PCF2127AT/1 Datasheet - Page 17

• Manufacturer Part Number: PCF2127AT/1
• Description: Integrated RTC, TCXO and quartz crystal
• Manufacturer: NXP [NXP Semiconductors]

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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