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PCF2129 Fiches technique(PDF) 24 Page - NXP Semiconductors

No de pièce PCF2129
Description  Accurate RTC with integrated quartz crystal for industrial applications
PDF  86 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2129 Fiches technique(HTML) 24 Page - NXP Semiconductors

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PCF2129
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© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 7 — 19 December 2014
24 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
After POR, the following mode is entered:
• 32.768 kHz CLKOUT active
• Power-On Reset Override (PORO) available to be set
• 24-hour mode is selected
• Battery switch-over is enabled
• Battery low detection is enabled
The register values after power-on are shown in Table 5 on page 8.
8.7.2 Power-On Reset Override (PORO)
The POR duration is directly related to the crystal oscillator start-up time. Due to the long
start-up times experienced by these types of circuits, a mechanism has been built in to
disable the POR and therefore speed up the on-board test of the device.
The setting of the PORO mode requires that POR_OVRD in register Control_1 is set
logic 1 and that the signals at the interface pins SDA/CE and SCL are toggled as
illustrated in Figure 14. All timings shown are required minimum.
Fig 12. Dependency between POR and oscillator
Fig 13. Power-On Reset (POR) system



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