ISL1221 Datasheet, PDF (18/24 Pages) Intersil Corporation – Low Power RTC with Battery Backed

ISL1221
SCL
SDA
START
DATA
DATA
DATA
STABLE CHANGE STABLE
STOP
FIGURE 14. VALID DATA CHANGES, START AND STOP CONDITIONS
SCL FROM
MASTER
1
SDA OUTPUT FROM
TRANSMITTER
8
9
HIGH IMPEDANCE
SDA OUTPUT FROM
RECEIVER
HIGH IMPEDANCE
START
ACK
FIGURE 15. ACKNOWLEDGE RESPONSE FROM RECEIVER
SIGNALS FROM
THE MASTER
SIGNAL AT SDA
SIGNALS FROM
THE ISL1221
WRITE
S
T
A ^{IDENTIFICATION}
R
BYTE
T
ADDRESS
BYTE
11011110 0000
A
A
C
C
K
K
DATA
BYTE
S
T
O
P
A
C
K
FIGURE 16. BYTE WRITE SEQUENCE
18
FN6316.1
July 15, 2010