PCF85263ATLSLASHA datasheet(63/100 Pages) NXP

Part #	PCF85263ATL/A

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

PDF	100 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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63 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

63 of 100

NXP Semiconductors

PCF85263A

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

I2C-bus interface

The I2C-bus is for bidirectional, two-line communication between different ICs. The two

lines are a Serial DAta line (SDA) and a Serial CLock line (SCL). Both lines must be

connected to a positive supply via a pull-up resistor. Data transfer may be initiated only

when the bus is not busy. Both data and clock lines remain HIGH when the bus is not

busy. The PCF85263A acts as a slave receiver when being written to and as a slave

transmitter when being read from.

Remark: When on VBAT power, the interface is not accessible.

9.1 Bit transfer

One data bit is transferred during each clock pulse. The data on the SDA line must remain

stable during the HIGH period of the clock pulse, as changes in the data line at this time

are interpreted as STOP or START conditions.

Fig 33. I2C read and write protocol

Fig 34. I2C read and write signaling

PCF85263ATL/A Datasheet(PDF) 63 Page - NXP Semiconductors