PCF85363ATLSLASHA datasheet(5/86 Pages) NXP

5 / 86 page

NXP Semiconductors

PCF85363A

Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input,

and I2C-bus

6.2 Pin description

Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.

Description

Symbol

PCF85363ATL

(DFN2626-10)

PCF85363ATT

(TSSOP8)

PCF85363ATT1

(TSSOP10)

Type

Primary use

Secondary use

OSCI

input

oscillator input

OSCO

output

oscillator output

VBAT

supply

battery backup supply voltage [1]

can be configured with TSPM[1:0] [2]

TS (CLK/INTB)

input/

output

timestamp input

INTB and CLK output (push-

pull); stop-watch control

VSS

5 [3]

supply

ground supply voltage

SDA

input/

output

serial data line

SCL

input

serial clock input

CLK

output

CLK (push-pull)

can be configured with INTAPM[1:0] [2]

INTA (CLK)

output

interrupt output (open-drain)

CLK output (open-drain)

VDD

supply

supply voltage

Table 3. Pin description

[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 43 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.

7 Functional description

The PCF85363A 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.

When the RAM is accessed, the wrap around will happen after address 7Fh, (see

Figure 5).

address register

00h

auto-increment

wrap around

01h

02h

03h

...

2Dh

2Eh

2Fh

address register

40h

auto-increment

wrap around

41h

42h

43h

...

7Dh

7Eh

7Fh

Time and configuration

registers

RAM registers

aaa-011066

Figure 5. Address register incrementing

PCF85363A

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

Product data sheet

Rev. 3.1 — 18 June 2021

5 / 86

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