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PCF85263ATL/A Datasheet(PDF) 45 Page - NXP Semiconductors

Part # PCF85263ATL/A
Description  Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus
PDF  100 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF85263ATL/A Datasheet(HTML) 45 Page - NXP Semiconductors

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PCF85263A
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© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 4.1 — 27 November 2015
45 of 100
NXP Semiconductors
PCF85263A
Tiny RTC with alarm, battery switch-over, and I2C-bus
8.11.2 BSRR: battery switch internal refresh rate
[1]
Default value.
Non-user bit. Recommended to leave set at default.
8.11.3 BSM[1:0]: battery switch mode
[1]
Default value.
Switching is automatic and controlled by the voltages on the VBAT and VDD pins. There
are three modes:
• Compare VDD with an internal reference (Vth)
• Compare VDD with VBAT
• Compare VDD with an internal reference (Vth) and VBAT
The last mode is useful when a rechargeable battery is employed.
Due to the nature of the power switch circuit there is a switching hysteresis (see Figure 23
and Table 68).
Table 39.
BSRR bit - battery switch control (address 26h) bit description
Bit
Symbol
Value
Description
3
BSRR
battery switch refresh rate
0[1]
low
1high
Table 40.
BSM[1:0] bits - battery switch control (address 26h) bit description
Bit
Symbol
Value
Description
2 to 1
BSM[1:0]
battery switch mode bits
00[1]
switching at the Vth level
01
switching at the VBAT level
10
switching at the higher level of Vth or VBAT
11
switching at the lower level of Vth or VBAT
Table 41.
Battery switch-over modes
BSM[1:0]
Condition
Internal power
00
VDD > Vth
VDD
VDD < Vth
VBAT
01
VDD > VBAT
VDD
VDD < VBAT
VBAT
10
VDD > the higher of Vth or VBAT
VDD
VDD < the higher of Vth or VBAT
VBAT
11
VDD > the lower of Vth or VBAT
VDD
VDD < the lower of Vth or VBAT
VBAT



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