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PCF2123 数据表(PDF) 9 Page - NXP Semiconductors

部件名 PCF2123
功能描述  Automotive tiny Real-Time Clock/calendar with alarm function and I2C-bus
PDF  59 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

PCF2123 数据表(HTML) 9 Page - NXP Semiconductors

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PCA85063A
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 4 — 30 March 2018
9 of 59
NXP Semiconductors
PCA85063A
Automotive Real-Time Clock/calendar with alarm function and I2C-bus
[1]
F0 is clocked at 32.768 kHz.
The lower two stages of the prescaler (F0 and F1) are not reset. And because the I2C-bus
is asynchronous to the crystal oscillator, the accuracy of restarting the time circuits is
between zero and one 8.192 kHz cycle (see Figure 5).
The first increment of the time circuits is between 0.507813 s and 0.507935 s after STOP
bit is released. The uncertainty is caused by the prescaler bits F0 and F1 not being reset
(see Table 7) and the unknown state of the 32 kHz clock.
Table 7.
First increment of time circuits after STOP bit release
Bit
Prescaler bits
[1]
1Hz tick
Time
Comment
STOP
F0F1-F2 to F14
hh:mm:ss
Clock is running normally
0
01-0 0001 1101 0100
12:45:12
prescaler counting normally
STOP bit is activated by user. F0F1 are not reset and values cannot be predicted externally
1
XX-0 0000 0000 0000
12:45:12
prescaler is reset; time circuits are frozen
New time is set by user
1
XX-0 0000 0000 0000
08:00:00
prescaler is reset; time circuits are frozen
STOP bit is released by user
0
XX-0 0000 0000 0000
08:00:00
prescaler is now running
XX-1 0000 0000 0000
08:00:00
-
XX-0 1000 0000 0000
08:00:00
-
XX-1 1000 0000 0000
08:00:00
-
:
::
11-1 1111 1111 1110
08:00:00
-
00-0 0000 0000 0001
08:00:01
0 to 1 transition of F14 increments the time circuits
10-0 0000 0000 0001
08:00:01
-
:
::
11-1 1111 1111 1111
08:00:01
-
00-0 0000 0000 0000
08:00:01
-
10-0 0000 0000 0000
08:00:01
-
:
::
11-1 1111 1111 1110
08:00:01
-
00-0 0000 0000 0001
08:00:02
0 to 1 transition of F14 increments the time circuits
Fig 5.
STOP bit release timing



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