PCF8564A datasheet(66/86 Pages) NXP

66 / 86 page

NXP Semiconductors

PCA2131

Nano-power highly accurate RTC with integrated quartz crystal for automotive applications

013aaa152

R/W

SA2

RA0

SDI

SDO

high-Z

SDI

SCL

WRITE

READ

tw(CE_N)

80%

20%

tclk(L)

th(CE_N)

trec(CE_N)

tdis(SDO)

td(R)SDO

tsu

tclk(H)

tsu(CE_N)

tclk(SCL)

tt(SDI-SDO)

Figure 40. SPI-bus timing

10.2 I2C-bus timing characteristics

All timing characteristics are valid within the operating supply voltage and ambient temperature range and reference to 30 %

and 70 % with an input voltage swing of VSS to VDD (see Figure 41).

Standard mode

Fast-mode (Fm)

Symbol

Parameter

Min

Max

Min

Max

Unit

Pin SCL

fSCL

SCL clock frequency

[1] 10

100

400

kHz

tLOW

LOW period of the SCL clock

4.7

1.3

µs

tHIGH

HIGH period of the SCL clock

4.0

0.6

µs

Pin SDA/CE

tSU;DAT

data set-up time

250

100

tHD;DAT

data hold time

Pins SCL and SDA/CE

tBUF

bus free time between a STOP

and START condition

4.7

1.5

µs

Table 92. I2C-bus characteristics

PCA2131

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

Product data sheet

Rev. 1.0 — 26 July 2021

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