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PCF2129 数据表(PDF) 39 Page - NXP Semiconductors

部件名 PCF2129
功能描述  Accurate RTC with integrated quartz crystal for industrial applications
PDF  86 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

PCF2129 数据表(HTML) 39 Page - NXP Semiconductors

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PCF2129
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 7 — 19 December 2014
39 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
The following tables show what instruction must be sent to clear the appropriate flag.
[1]
The bits labeled as - have to be rewritten with the previous values.
[1]
The bits labeled as - have to be rewritten with the previous values.
8.11 Timestamp function
The PCF2129 has an active LOW timestamp input pin TS, internally pulled with an
on-chip pull-up resistor to Voper(int). It also has a timestamp detection circuit which can
detect two different events:
1. Input on pin TS is driven to an intermediate level between power supply and ground.
2. Input on pin TS is driven to ground.
The timestamp function is enabled by default after power-on and it can be switched off by
setting the control bit TSOFF (register Timestp_ctl).
Table 54.
Example values in register Control_2
Register
Bit
7
6
5
4
3
2
1
0
Control_2
101
10000
Table 55.
Example to clear only AF (bit 4)
Register
Bit
7
6
5
4
3
2
1
0
Control_2
1
0
1
0
0
0[1]
0[1]
0
Table 56.
Example to clear only MSF (bit 7)
Register
Bit
7
6
5
4
3
2
1
0
Control_2
0
0
1
1
0
0[1]
0[1]
0
(1) When using switches or push-buttons, it is recommended to connect a 1 nF capacitance to the TS
pin to ensure proper switching.
Fig 20. Timestamp detection with two push-buttons on the TS pin (for example, for
tamper detection)



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