PCF8564A datasheet(44/65 Pages) NXP

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PCF85063A

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Product data sheet

Rev. 7 — 30 March 2018

44 of 65

NXP Semiconductors

PCF85063A

Tiny Real-Time Clock/calendar with alarm function and I2C-bus

[1]

A detailed description of the I2C-bus specification is given in Ref. 16 “UM10204”.

[2]

I2C-bus access time between two STARTs or between a START and a STOP condition to this device must be less than one second.

[3]

A device must internally provide a hold time of at least 300 ns for the SDA signal (with respect to the VIH(min) of the SCL signal) to bridge

the undefined region of the falling edge of SCL.

[4]

The maximum tf for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage tf is specified at

250 ns. This allows series protection resistors to be connected in between the SDA and the SCL pins and the SDA/SCL bus lines

without exceeding the maximum specified tf.

Table 42.

I2C-bus characteristics

VDD = 1.8 V to 5.5 V; VSS =0V; Tamb = 40 C to +85 C; fosc = 32.768 kHz; quartz Rs =60 k; CL = 7 pF; unless otherwise

specified. All timing values are valid within the operating supply voltage and temperature range and referenced to VIL and VIH

with an input voltage swing of VSS to VDD[1].

Symbol

Parameter

Conditions

Min

Max

Unit

capacitive load for

each bus line

400

fSCL

SCL clock frequency

[2] 0

400

kHz

tHD;STA

hold time (repeated)

START condition

0.6

s

tSU;STA

set-up time for a

repeated START

condition

0.6

s

tLOW

LOW period of the

SCL clock

1.3

s

tHIGH

HIGH period of the

SCL clock

0.6

s

rise time of both SDA

and SCL signals

300

fall time of both SDA

and SCL signals

[3][4] 20

 (V

DD /5.5 V)

300

tBUF

bus free time between

a STOP and START

condition

1.3

s

tSU;DAT

data set-up time

100

tHD;DAT

data hold time

tSU;STO

set-up time for STOP

condition

0.6

s

tVD;DAT

data valid time

0.9

s

tVD;ACK

data valid

acknowledge time

00.9

s

tSP

pulse width of spikes

that must be

suppressed by the

input filter

050

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