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PCF2129A bảng dữ liệu(PDF) 16 Page - NXP Semiconductors

tên linh kiện PCF2129A
Giải thích chi tiết về linh kiện  Integrated RTC, TCXO and quartz crystal
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PCF2129A bảng dữ liệu(HTML) 16 Page - NXP Semiconductors

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PCF2129A_1
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 01 — 13 January 2010
16 of 68
NXP Semiconductors
PCF2129A
Integrated RTC, TCXO and quartz crystal
The direct switching mode is useful in systems where VDD is higher than VBAT at all times.
The direct switching mode is not recommended if the VDD and VBAT values are similar
(e.g. VDD = 3.3 V, VBAT ≥ 3.0 V). In direct switching mode the power consumption is
reduced compared to the standard mode because the monitoring of VDD and Vth(sw)bat is
not performed.
8.5.1.3
Battery switch-over disabled: only one power supply (VDD)
When the battery switch-over function is disabled:
• The power supply is applied on the VDD pin
• The VBAT pin must be connected to ground
• The internal power supply, available at the output pin BBS, is equal to VDD
• The battery flag (BF) is always logic 0
8.5.1.4
Battery switch-over architecture
The architecture of the battery switch-over circuit is shown in Figure 6.
Fig 5.
Battery switch-over behavior in direct switching mode with bit BIE logic 1
(enabled)
001aaj312
internal power supply (= VBBS)
cleared via interface
backup battery operation
BF
Vth(sw)bat
(= 2.5 V)
VDD (= 0 V)
VBAT
VDD
VBBS
VBBS
INT



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