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PCF2127AT/1 Datasheet(PDF) 17 Page - NXP Semiconductors |
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PCF2127AT/1 Datasheet(HTML) 17 Page - NXP Semiconductors |
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17 / 80 page  PCF2127A_2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 02 — 7 May 2010 17 of 80 NXP Semiconductors PCF2127A Integrated RTC, TCXO and quartz crystal 8.6 Power management functions The PCF2127A has two power supply pins and one power output pin: • VDD - the main power supply input pin • VBAT - the battery backup input pin • BBS - battery backed output voltage pin (equal to the internal power supply) The PCF2127A has three power management functions implemented: • Battery switch-over function • Battery low detection function • Extra power fail detection function The power management functions are controlled by the control bits PWRMNG[2:0] in register Control_3: [1] Default value. [2] When the battery switch-over function is disabled, the PCF2127A works only with the power supply VDD; VBAT must be put to ground and the battery low detection function is disabled. Table 17. Power management control bit description PWRMNG[2:0] Function 000 [1] battery switch-over function is enabled in standard mode; battery low detection function is enabled; extra power fail detection function is enabled 001 battery switch-over function is enabled in standard mode; battery low detection function is disabled; extra power fail detection function is enabled 010 battery switch-over function is enabled in standard mode; battery low detection function is disabled; extra power fail detection function is disabled 011 battery switch-over function is enabled in direct switching mode; battery low detection function is enabled; extra power fail detection function is enabled 100 battery switch-over function is enabled in direct switching mode; battery low detection function is disabled; extra power fail detection function is enabled 101 battery switch-over function is enabled in direct switching mode; battery low detection function is disabled; extra power fail detection function is disabled 110 [2] battery switch-over function is disabled - only one power supply (VDD); battery low detection function is disabled; extra power fail detection function is enabled 111 [2] battery switch-over function is disabled - only one power supply (VDD); battery low detection function is disabled; extra power fail detection function is disabled |
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