UM10301User Manual for NXP Real Time Clocks PCF85x3, PCF85x63,PCA8565, PCF2123, and PCA21125Rev. 2.1 — 23 July 2015 User manualDocument informationInfo ContentKeywords PCF8563, PCF8583, PCF8593, PCA8565, PCF85263, PCF85363,PCF85063, PCF2123, PCA21125, PCF2120, RTC, real time clock,timekeeping, crystal, 32.768 kHz, backup.Abstract This user manual aims to assist a user of above mentioned Real TimeClocks in achieving successful design-in and application. It containsuseful hints with respect to electrical schematic and PCB layout as wellas code examples for the well-established NXP PCF8563 and relatedReal Time Clocks. Also the more recent Real Time Clocks PCF2123 andPCA21125 have been taken into account.

NXP Semiconductors PC 85 3 Series User Manual

contact information

event counter mode

power-on reset (por)

oscillation allowance

crystal and crystal selection

modes which don't work

capacitors and capacitor selection

oscillator tuning

pcf2123 offset register

century and leap year, daylight saving time

setting the timer

backup power supply

nicd and nimh secondary batteries

diode selection

pcb layout guidelines

partial circuit switch down

hints to keep power consumption low

troubleshooting

wrong time and date, wrong clock speed

legal information

UM10301 PCA8565

UM10301 PCF2123

PC 212 Series

PC 85 3 Series

PCA21125

PCF2120

PCF85 3 Series

PCF85 63 Series

PCF85063

PCF85263

PCF85363

PCF8563

PCF8583

PCF8593