PCF85263ATLSLASHA datasheet(98/100 Pages) NXP

98 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

98 of 100

NXP Semiconductors

PCF85263A

Tiny RTC with alarm, battery switch-over, and I2C-bus

30. Figures

Fig 1.

Block diagram of PCF85263A . . . . . . . . . . . . . . . .3

Fig 2.

Pin configuration for PCF85263AT (SO8) . . . . . . .4

Fig 3.

Pin configuration for PCF85263ATL

(DFN2626-10) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Fig 4.

Pin configuration for PCF85263ATT (TSSOP8). . .4

Fig 5.

Pin configuration for PCF85263ATT1 (TSSOP10).5

Fig 6.

Address register incrementing . . . . . . . . . . . . . . . .7

Fig 7.

Fig 8.

Time mode register set selection . . . . . . . . . . . . . .8

Fig 9.

OS status bit . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Fig 10. Data flow for the time function . . . . . . . . . . . . . . .17

Fig 11. Data flow for the stop-watch function. . . . . . . . . .19

Fig 12. Alarm1 and alarm2 function block diagram

(RTC mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Fig 13. Alarm1 and alarm2 function block diagram

(stop-watch mode) . . . . . . . . . . . . . . . . . . . . . . . .25

Fig 14. WatchDog repeat mode . . . . . . . . . . . . . . . . . . . .27

Fig 15. WatchDog single shot mode . . . . . . . . . . . . . . . .28

Fig 16. Timestamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Fig 17. Example battery switch-over timestamp . . . . . . .31

Fig 18. Example TS pin driven timestamp . . . . . . . . . . . .31

Fig 19. Offset calibration calculation workflow . . . . . . . . .37

Fig 20. Result of offset calibration . . . . . . . . . . . . . . . . . .38

Fig 21. Interrupt pulse width. . . . . . . . . . . . . . . . . . . . . . .40

Fig 22. Interrupt selection . . . . . . . . . . . . . . . . . . . . . . . .41

Fig 23. Threshold voltage switching hysteresis . . . . . . . .46

Fig 24. Switching at Vth . . . . . . . . . . . . . . . . . . . . . . . . . .46

Fig 25. Switching at VBAT . . . . . . . . . . . . . . . . . . . . . . . . .47

Fig 26. Switching at the higher of VBAT or Vth . . . . . . . . .48

Fig 27. Switching at the lower of VBAT or Vth . . . . . . . . . .49

Fig 28. TS pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Fig 29. INTA pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Fig 30. Software reset command . . . . . . . . . . . . . . . . . . .58

Fig 31. CPR and STOP bit functional diagram . . . . . . . .61

Fig 32. STOP release timing . . . . . . . . . . . . . . . . . . . . . .61

Fig 33. I2C read and write protocol . . . . . . . . . . . . . . . . .63

Fig 34. I2C read and write signaling. . . . . . . . . . . . . . . . .63

Fig 35. Application example. . . . . . . . . . . . . . . . . . . . . . .67

Fig 36. Application example timing . . . . . . . . . . . . . . . . .68

Fig 37. Device diode protection diagram of PCF85263A.69

Fig 38. Typical IDD with respect to fSCL . . . . . . . . . . . . . .73

Fig 39. Typical IDD as a function of temperature . . . . . . .73

Fig 40. Typical IDD with respect to VDD . . . . . . . . . . . . . .74

Fig 41. Oscillator frequency variation with respect to

VDD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Fig 42. I2C-bus timing diagram; rise and fall times refer

to 30 % and 70 % . . . . . . . . . . . . . . . . . . . . . . . .77

Fig 43. Application diagram for PCF85263A . . . . . . . . . .77

Fig 44. Package outline SOT96-1 (SO8), PCF85263AT .79

Fig 45. Package outline SOT1197-1 (DFN2626-10),

PCF85263ATL . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Fig 46. Package outline SOT505-1 (TSSOP8),

PCF85263ATT . . . . . . . . . . . . . . . . . . . . . . . . . . .81

Fig 47. Package outline SOT552-1 (TSSOP10),

PCF85263ATT1 . . . . . . . . . . . . . . . . . . . . . . . . . .82

Fig 48. Temperature profiles for large and small

components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Fig 49. Footprint information for reflow soldering of

SOT96-1 (SO8), PCF85263AT . . . . . . . . . . . . . . 86

Fig 50. Footprint information for reflow soldering of

SOT1197-1 (DFN2626-10),PCF85263ATL . . . . . 87

Fig 51. Footprint information for reflow soldering of

SOT505-1 (TSSOP8),PCF85263ATT . . . . . . . . . 88

Fig 52. Footprint information for reflow soldering of

SOT552-1 (TSSOP10), PCF85263ATT1 . . . . . . 89

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