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| PCA21125 Datasheet, PDF (34/42 Pages) NXP Semiconductors – SPI-bus Real-Time Clock and calendar | |||
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NXP Semiconductors
PCA21125
SPI-bus Real-Time Clock and calendar
CE
SCL
tsu(CE)
WRITE
SDI
SDO
tsu
th
R/W
SA2
Hi Z
READ
SDI
b7
b6
Hi Z
SDO
Fig 25. SPI interface timing
tw(CE)
tr
tf
80%
20%
tclk(L)
tclk(H)
th(CE)
trec(CE)
RA0
b7
b6
b0
b0
tt(SDI-SDO)
td(R)SDO
b7
b6
tdis(SDO)
b0
001aag900
PCA21125_1
Product data sheet
Rev. 01 â 16 November 2009
© NXP B.V. 2009. All rights reserved.
34 of 42
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