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PCF85063AT/AAZ 데이터시트(PDF) 19 Page - NXP Semiconductors

부품명 PCF85063AT/AAZ
상세설명  Tiny Real-Time Clock/calendar with alarm function and I2C-bus
PDF  55 Pages
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PCF85063AT/AAZ 데이터시트(HTML) 19 Page - NXP Semiconductors

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NXP Semiconductors
PCF85063A
Tiny Real-Time Clock/calendar with alarm function and I2C-bus
7.3.1.1 OS: Oscillator stop
When the oscillator of the PCF85063A is stopped, the OS flag is set. The oscillator can be stopped, for
example, by connecting one of the oscillator pins OSCI or OSCO to ground. The oscillator is considered to be
stopped during the time between power-on and stable crystal resonance. This time can be in the range of 200
ms to 2 s depending on crystal type, temperature, and supply voltage.
The flag remains set until cleared by command (see Figure 13). If the flag cannot be cleared, then the oscillator
is not running. This method can be used to monitor the oscillator and to determine if the supply voltage has
reduced to the point where oscillation fails.
aaa-004420
t
OS = 1 and flag can not be cleared
VDD
oscillation
oscillation now stable
OS flag cleared
by software
OS flag set when
oscillation stops
OS flag
OS = 1 and flag can be cleared
Figure 13. OS flag
7.3.2 Register Minutes
Bit
Symbol
Value
Place value
Description
7
-
0
-
unused
6 to 4
0[1] to 5
ten’s place
3 to 0
MINUTES
0[1] to 9
unit place
actual minutes coded in BCD format
Table 20. Minutes - minutes register (address 05h) bit description
[1]
Default value.
7.3.3 Register Hours
Bit
Symbol
Value
Place value
Description
7 to 6
-
00
-
unused
12-hour mode[1]
AM/PM indicator
0[2]
-
AM
5
AMPM
1
-
PM
4
0[2] to 1
ten’s place
3 to 0
HOURS
0[2] to 9
unit place
actual hours in 12-hour mode coded in
BCD format
24-hour mode[1]
5 to 4
HOURS
0[2] to 2
ten’s place
actual hours in 24-hour mode coded in
BCD format
Table 21. Hours - hours register (address 06h) bit description
PCF85063A
All information provided in this document is subject to legal disclaimers.
© 2023 NXP B.V. All rights reserved.
Product data sheet
Rev. 7.1 — 8 November 2023
19 / 55



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