PCF85263ATLSLASHA datasheet(100/102 Pages) NXP

100 / 102 page

NXP Semiconductors

PCF85263A

Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus

Figures

Fig. 1.

Block diagram of PCF85263A ...........................6

Fig. 2.

Pin configuration for PCF85263AT (SO8) ......... 7

Fig. 3.

Pin configuration for PCF85263ATL

(DFN2626-10) ....................................................7

Fig. 4.

Pin configuration for PCF85263ATT

(TSSOP8) ..........................................................7

Fig. 5.

Pin configuration for PCF85263ATT1

(TSSOP10) ........................................................8

Fig. 6.

Pin configuration for PCF85263AUK

(WLCSP12) ....................................................... 8

Fig. 7.

Address register incrementing .........................10

Fig. 8.

Fig. 9.

Time mode register set selection .................... 11

Fig. 10.

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

Fig. 11.

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

Fig. 12.

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

Fig. 13.

Alarm1 and alarm2 function block diagram

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

Fig. 14.

Alarm1 and alarm2 function block diagram

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

Fig. 15.

Watchdog repeat mode ...................................27

Fig. 16.

Watchdog single shot mode ............................28

Fig. 17.

Timestamp .......................................................29

Fig. 18.

Example battery switch-over timestamp ..........30

Fig. 19.

Example TS pin driven timestamp .................. 31

Fig. 20.

Offset calibration calculation workflow .............36

Fig. 21.

Result of offset calibration ...............................36

Fig. 22.

Interrupt pulse width ........................................39

Fig. 23.

Interrupt selection ............................................40

Fig. 24.

Threshold voltage switching hysteresis ........... 45

Fig. 25.

Switching at Vth .............................................. 45

Fig. 26.

Switching at VBAT .......................................... 46

Fig. 27.

Switching at the higher of VBAT or Vth ........... 47

Fig. 28.

Switching at the lower of VBAT or Vth .............47

Fig. 29.

TS pin ..............................................................50

Fig. 30.

INTA pin .......................................................... 51

Fig. 31.

Software reset command ................................ 56

Fig. 32.

CPR and STOP bit functional diagram ............59

Fig. 33.

STOP release timing .......................................59

Fig. 34.

I2C read and write protocol .............................61

Fig. 35.

I2C read and write signaling ........................... 61

Fig. 36.

Application example ........................................ 65

Fig. 37.

Application example timing ............................. 66

Fig. 38.

Device diode protection diagram of

PCF85263A .....................................................67

Fig. 39.

Typical IDD with respect to fSCL .....................72

Fig. 40.

Typical IDD as a function of temperature ........ 72

Fig. 41.

Typical IDD with respect to VDD .....................73

Fig. 42.

Oscillator frequency variation with respect

to VDD ............................................................ 74

Fig. 43.

I2C-bus timing diagram; rise and fall times

refer to 30 % and 70 % .................................. 75

Fig. 44.

Application diagram for PCF85263A ............... 76

Fig. 45.

Package outline SOT96-1 (SO8),

PCF85263AT ................................................... 78

Fig. 46.

Package outline SOT1197-1

(DFN2626-10), PCF85263ATL ........................ 79

Fig. 47.

Package outline SOT505-1 (TSSOP8),

PCF85263ATT .................................................80

Fig. 48.

Package outline SOT552-1 (TSSOP10),

PCF85263ATT1 ...............................................81

Fig. 49.

Package outline SOT2035-1 (WLCSP12),

PCF85263AUK 1 of 2 ..................................... 82

Fig. 50.

Package outline SOT2035-1 (WLCSP12),

PCF85263AUK 2 of 2 ..................................... 83

Fig. 51.

Temperature profiles for large and small

components .....................................................87

Fig. 52.

Footprint information for reflow soldering of

SOT96-1 (SO8), PCF85263AT ........................88

Fig. 53.

Footprint information for reflow soldering of

SOT1197-1 (DFN2626-10),PCF85263ATL ......89

Fig. 54.

Footprint information for reflow soldering of

SOT505-1 (TSSOP8),PCF85263ATT ..............90

Fig. 55.

Footprint information for reflow soldering of

SOT552-1 (TSSOP10), PCF85263ATT1 .........91

PCF85263A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 5.4 — 12 December 2025

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