pca2125 NXP Semiconductors, pca2125 Datasheet - Page 32
pca2125
Manufacturer Part Number
pca2125
Description
Spi Real Time Clock / Calendar Semiconductors
Manufacturer
NXP Semiconductors
Datasheet
1.PCA2125.pdf
(40 pages)
NXP Semiconductors
10. Application information
PCA2125_00
Preliminary data sheet
Fig 21. SPI interface timing
WRITE
READ
SDO
SDO
SCL
SDI
SDI
CE
t
CES
t
DS
R/W
Hi Z
Hi Z
b7
Fig 22. Application diagram.
t
DH
The 1 Farad capacitor is used as a standby/back-up supply. With the RTC in its minimum
power configuration i.e. timer off and CLKOUT off, the RTC may operate for weeks.
SA2
b6
Rev. 00.11 — 30 January 2007
20%
t
RF
80%
t
RF
RA0
b0
t
ZZ
t
WCE
supercap
OSCI
OSCO
INT
1 F
b7
V
t
RD
b7
DD
PCA2125
V
SS
CLKOUT
b6
b6
t
WH
SDO
SCL
SDI
t
CE
CYC
SPI Real time clock / calendar
t
WL
001aaf918
PCA2125
b0
t
b0
© NXP B.V. 2007. All rights reserved.
CEH
001aaf917
t
CER
t
RZ
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