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SMS24 Datasheet(PDF) 9 Page - Summit Microelectronics, Inc.

Part # SMS24
Description  Highly Programmble Voltage Supervisory Circuit
PDF  18 Pages
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Manufacturer  SUMMIT [Summit Microelectronics, Inc.]
Direct Link  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMS24 Datasheet(HTML) 9 Page - Summit Microelectronics, Inc.

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9
2048 2.4. 3/1/01
SMS24
SUMMIT MICROELECTRONICS, Inc.
The SMS24 will respond with an ACKnowledge after
recognition of a START condition and its slave address
byte. If both the device and a write operation are selected
the SMS24 will respond with an ACKnowledge after the
receipt of each subsequent 8-bit word. In the READ mode
the SMS24 transmits eight bits of data, then releases the
SDA line, and monitors the line for an ACKnowledge
signal. If an ACKnowledge is detected, and if no STOP
condition is generated by the master, the SMS24 will
continue to transmit data. If an ACKnowledge is not
detected the SMS24 will terminate further data transmis-
sions and await a STOP condition before returning to the
standby power mode.
Device Addressing
Following a start condition the master must output the
address of the slave it is accessing. The most significant
Figure 2. Programming the SMS24
Write Configuration Register
Master
SDA
S
T
A
R
T
A
C
K
XX X
R
/
W
A
C
K
C
2
C
1
C
0
T
3
T
2
T
1
T
0
A
C
K
S
T
O
P
1
0
10
Master
SDA
Device Type
Address
Bus
Address
00 0 00 0 1 1
2046 Fig02 2.0
L
O
C
K
Program Register 0
S
T
A
R
T
A
C
K
XX X
R
/
W
A
C
K
A
C
K
S
T
O
P
1
0
10
Device Type
Address
Bus
Address
00 0 00 0 0 0
X
R
T
1
R
T
0
R
R
4
R
R
3
R
R
2
R
R
1
R
R
0
Program Register 1
S
T
A
R
T
A
C
K
XX X
R
/
W
A
C
K
A
C
K
S
T
O
P
1
0
10
Device Type
Address
Bus
Address
00 0 00 0 0 1
O
V
A
D
D
T
W
D
2
W
D
1
W
D
0
L
O
C
K
X
SMS24
SMS24
four bits of the slave address are the device type identifier.
For the SMS24 this is be 1010BIN or 1011BIN depending
upon the DT bit of PR1. The configuration and Program
Registers have a device type address of 1001.
The next three bits are the high order address bits.
The last bit of the data stream defines the operation to be
performed. When set to “1” a read operation is selected.
When set to “0” a write operation is selected.
WRITE OPERATIONS
The SMS24 allows two types of write operations: byte
write and page write. A byte write operation writes a single
byte during the nonvolatile write period (tWR). The page
write operation allows up to 16 bytes in the same page to
be written during tWR.



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