PCF85263ATSLASHA datasheet(6/92 Pages) NXP

6 / 92 page

NXP Semiconductors

PCF85263A

Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus

[1]

Connect to VDD if not used.

[2]

See Table 6 and Table 46.

[3]

The die paddle (exposed pad) is connected to VSS through high ohmic (non-conductive) silicon attach and should be electrically isolated. It is good

engineering practice to solder the exposed pad to an electrically isolated PCB copper pad as shown in Figure 46 for better heat transfer but it is not

required as the RTC doesn’t consume much power. In no case should traces be run under the package exposed pad.

[4]

See Table 6 and Table 48.

7 Functional description

The PCF85263A contains 8-bit registers for time information, for timestamp information

and registers for system configuration. Included is an auto-incrementing register address,

an on-chip 32.768 kHz oscillator with integrated capacitors, a frequency divider which

provides the source clock for the Real-Time Clock (RTC) and calender, and an I2C-bus

interface with a maximum data rate of 400 kbit/s.

The built-in address register will increment automatically after each read or write of a

data byte. After register 2Fh, the auto-incrementing will wrap around to address 00h (see

Figure 7).

aaa-009084

address register

00h

auto-increment

wrap around

01h

02h

03h

...

2Dh

2Eh

2Fh

Figure 7. Address register incrementing

All registers (see Table 4, Table 5, and Table 6) are designed as addressable 8-bit

parallel registers although not all bits are implemented. Figure 8 gives an overview of the

address map.

PCF85263A

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

Product data sheet

Rev. 5 — 1 February 2021

6 / 92

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