ADM1062 datasheet(30/32 Pages) AD

30 / 32 page

ADM1062

Preliminary Technical Data

Rev. PrJ | Page 30 of 32

EEPROM address. This is illustrated in Figure 43.

Figure 43. Setting An EEPROM Address

Note for page erasure that as a page consists of 32 bytes

only the three MSB’s of the address low byte are important.

The lower 5 bits of the EEPROM address low byte only

specify addresses within a page and are ignored during an

erase operation.

Write a single byte of data to EEPROM. In this case the

command byte is the high byte of the EEPROM address

from F8h to FBh. The first data byte is the low byte of the

EEPROM address and the second data byte is the actual

data. This is illustrated in Figure 44

Figure 44. Single Byte Write To EEPROM

Block Write

In this operation the master device writes a block of data to a

slave device. The start address for a block write must previously

have been set. In the case of the ADM1062 this is done by a

Send Byte operation to set a RAM address or a Write Byte/Word

operation to set an EEPROM address.

The master device asserts a start condition on SDA.

The master sends the 7-bit slave address followed by

the write bit (low).

The addressed slave device asserts ACK on SDA.

The master sends a command code that tells the slave

device to expect a block write. The ADM1062 command

code for a block write is FCh (11111100).

The slave asserts ACK on SDA.

The master sends a data byte that tells the slave device how

many data bytes will be sent. The SMBus specification

allows a maximum of 32 data bytes to be sent in a block

write.

The slave asserts ACK on SDA.

The master sends N data bytes.

The slave asserts ACK on SDA after each data byte.

10. The master asserts a STOP condition on SDA to end the

transaction.

Figure 45. Block Write To EEPROM Or RAM

Unlike some EEPROM devices which limit block writes to

within a page boundary, there is no limitation on the start

address when performing a block write to EEPROM, except:

There must be at least N locations from the start address to

the highest EEPROM address (FBFFh), to avoiding writing

to invalid addresses.

If the addresses cross a page boundary, both pages must be

erased before programming.

Note that the ADM1062 features a clock extend function for

writes to EEPROM. Programming an EEPROM byte takes

approximately 250µs, which would limit the SMBus clock for

repeated or block write operations. The ADM1062 pulls SCL

low and extends the clock pulse when it cannot accept any more

data.

ADM1062 READ OPERATIONS

The ADM1062 uses the following SMBus read protocols:

Receive Byte

In this operation the master device receives a single byte

from a slave device, as follows:

The master device asserts a START condition on SDA.

The master sends the 7-bit slave address followed by the

read bit (high).

The addressed slave device asserts ACK on SDA.

The master receives a data byte.

The master asserts NO ACK on SDA.

The master asserts a STOP condition on SDA and the

transaction ends.

In the ADM1062, the receive byte protocol is used to read a

single byte of data from a RAM or EEPROM location whose

address has previously been set by a send byte or write

byte/word operation. This is illustrated in Figure 46.

Figure 46. Single Byte Read From EEPROM Or RAM

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