NXP Semiconductors PCF85 3 Series Manuals

Manuals and User Guides for NXP Semiconductors PCF85 3 Series. We have 1 NXP Semiconductors PCF85 3 Series manual available for free PDF download: User Manual

NXP Semiconductors PCF85 3 Series User Manual

NXP Semiconductors PCF85 3 Series User Manual (54 pages)

Real Time Clocks

Brand: NXP Semiconductors | Category: Time Clocks | Size: 0 MB

Table of Contents

Introduction
3
- Features
  4
- Comparison
  6
- Event Counter Mode
  6
Fig 1. Power-On Reset
8
- Power-On Reset (POR)
  8
- Voltage-Low Detector
  8
Fig 2. Voltage-Low Detection
9
Fig 3. Oscillator-Stop Detection
9
- Oscillator
  9
Fig 4. Pierce Oscillator Equivalent Diagram
10
Fig 5. Oscillator Frequency Determining Components
11
Fig 6. Graph of Oscillator Frequency as Function of Load Capacitance C L
12
Fig 7. the Deviation in Frequency Vs. Temperature of a Typical 32.768 Khz Crystal
17
- Modes Which Don't Work
  17
- Effect of Temperature
  17
- Capacitors and Capacitor Selection
  19
- Accuracy
  20
Fig 8. Influences on Time Accuracy
21
- Oscillator Tuning
  22
Fig 9. Oscillator Tuning
23
Fig 10. Block Diagram PCF8563
26
Fig 11. Alarm Function
28
- Setting the Timer
  29
- Backup Power Supply
  30
- Lithium Primary Cells
  30
Fig 12. Backup Circuit Using Primary Lithium Cell
31
Fig 13. Backup Circuit Using Secondary Cell (Nicd or Nimh)
32
- Nicd and Nimh Secondary Batteries
  32
- Capacitors
  33
- Charging the Backup Capacitor
  34
- Estimation of Backup Time with Capacitor
  34
- Diode Selection
  35
- PCB Layout Guidelines
  36
Fig 14. PCB Layout Proposal for PCF8563 Using Leaded Components
37
Fig 15. PCB Layout Proposal for PCF8563 Using SMD Components and Guard Ring
38
- Partial Circuit Switch down
  38
Fig 16. Protection Diodes
39
- Hints to Keep Power Consumption Low
  39
Fig 17. P(Max) as a Function of Bus Capacitance
41
Fig 18. Application Diagram 1, I C-Bus Interface
42
Fig 19. Application Diagram 2, SPI Interface
42
Fig 20. General Countdown Timer Behaviour
43
Fig 21. Block Diagram I C Interface and Time Counters
46
Fig 22. Sequence of Events (Example READ)
47
- Checking for Oscillation
  48
- Oscillator Startup Time
  48
- Troubleshooting
  48
- C-Bus
  49
- No Communication Via I
  49
- References
  50
- Wrong Time and Date, Wrong Clock Speed
  50
- Definitions
  51
- Disclaimers
  51
- Legal Information
  51
- Trademarks
  51
- Table of Contents
  52
- List of Figures
  52
- List of Tables
  53
- Contents
  54

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