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SMS24

Highly Programmble Voltage Supervisory Circuit

Summit Microelectronics 

SMS24

S

T

Write Configuration Register

S

A

T

R Device Type Bus

O

T Address Address

P

R

1001X XX/

W

0 0 0 0 00 11

L

O

C

C

C

T

T

T

T

C2 1 0 3 2 1 0

K

A

A

A

C

C

C

K

K

K

Master

SDA

SMS24

S

T

Program Register 0

S

A

T

R Device Type Bus

O

T Address Address

P

R

1001X XX/

W

0 0 0 0 00 00

RRRR RR R

X T T RR RR R

1043 21 0

A

A

A

C

C

C

K

K

K

Master

SDA

SMS24

S

T

Program Register 1

S

A

T

R Device Type Bus

O

T Address Address

P

R

1001X XX/

W

0 0 00 00 01

X

L

O

C

K

OA D

V DT

WWW

DDD

210

A

A

A

C

C

C

K

K

K

2046 Fig02 2.0

Figure 2. Programming the SMS24

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

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.

SUMMIT MICROELECTRONICS, Inc.

2048 2.4. 3/1/01

9

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