Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
DS1390/DS1391/DS1392/DS1393
CE
t
CC
t
R
t
F
SCLK
t
CL
t
CDH
t
DC
I/O
t
CH
t
CDD
t
CDZ
A0
A1
R/W
D0
D7
WRITE ADDRESS BYTE
READ DATA BYTE
Figure 3. Timing Diagram鈥?-Wire Read Transfer
t
CWH
CE
t
CC
SCLK
t
CL
t
CDH
t
DC
I/O
A0
A1
R/W
D0
D7
t
CH
t
R
t
F
t
CCH
WRITE ADDRESS BYTE
WRITE DATA BYTE
Figure 4. Timing Diagram鈥?-Wire Write Transfer
6
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