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ADM1062 Datasheet(PDF) 31 Page - Analog Devices

Part No. ADM1062
Description  Super Sequencer with Margining Control and Temperature Monitoring
Download  36 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADM1062 Datasheet(HTML) 31 Page - Analog Devices

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ADM1062
Rev. C | Page 31 of 36
SMBus PROTOCOLS FOR RAM AND EEPROM
The ADM1062 contains volatile registers (RAM) and non-
volatile registers (EEPROM). User RAM occupies Address 0x00
to Address 0xDF; the EEPROM occupies Address 0xF800 to
Address 0xFBFF.
Data can be written to and read from both the RAM and the
EEPROM as single data bytes. Data can be written only to unpro-
grammed EEPROM locations. To write new data to a programmed
location, the location contents must first be erased. EEPROM
erasure cannot be done at the byte level. The EEPROM is arranged
as 32 pages of 32 bytes each, and an entire page must be erased.
Page erasure is enabled by setting Bit 2 in the UPDCFG register
(Address 0x90) to 1. If this bit is not set, page erasure cannot
occur, even if the command byte (0xFE) is programmed across
the SMBus.
WRITE OPERATIONS
The SMBus specification defines several protocols for different
types of read and write operations. The following abbreviations
are used in Figure 42 to Figure 50:
S = Start
P = Stop
R = Read
W = Write
A = Acknowledge
A = No acknowledge
The ADM1062 uses the following SMBus write protocols.
Send Byte
In a send byte operation, the master device sends a single
command byte to a slave device, as follows:
1.
The master device asserts a start condition on SDA.
2.
The master sends the 7-bit slave address followed by the
write bit (low).
3.
The addressed slave device asserts an acknowledge (ACK)
on SDA.
4.
The master sends a command code.
5.
The slave asserts an ACK on SDA.
6.
The master asserts a stop condition on SDA, and the
transaction ends.
In the ADM1062, the send byte protocol is used for two purposes:
To write a register address to the RAM for a subsequent single
byte read from the same address, or for a block read or a
block write starting at that address, as shown in Figure 42.
24
13
5
6
SLAVE
ADDRESS
RAM
ADDRESS
(0x00 TO 0xDF)
SW
A
A
P
Figure 42. Setting a RAM Address for Subsequent Read
To erase a page of EEPROM memory. EEPROM memory
can be written to only if it is unprogrammed. Before writing
to one or more EEPROM memory locations that are already
programmed, the page(s) containing those locations must
first be erased. EEPROM memory is erased by writing a
command byte.
The master sends a command code telling the slave device
to erase the page. The ADM1062 command code for a page
erasure is 0xFE (1111 1110). Note that for a page erasure to
take place, the page address must be given in the previous
write word transaction (see the Write Byte/Word section).
In addition, Bit 2 in the UPDCFG register (Address 0x90)
must be set to 1.
24
13
5
6
SLAVE
ADDRESS
COMMAND
BYTE
(0xFE)
SW
A
A
P
Figure 43. EEPROM Page Erasure
As soon as the ADM1062 receives the command byte,
page erasure begins. The master device can send a stop
command as soon as it sends the command byte. Page
erasure takes approximately 20 ms. If the ADM1062 is
accessed before erasure is complete, it responds with a no
acknowledge (NACK).
Write Byte/Word
In a write byte/word operation, the master device sends a
command byte and one or two data bytes to the slave device,
as follows:
1.
The master device asserts a start condition on SDA.
2.
The master sends the 7-bit slave address followed by the
write bit (low).
3.
The addressed slave device asserts an ACK on SDA.
4.
The master sends a command code.
5.
The slave asserts an ACK on SDA.
6.
The master sends a data byte.
7.
The slave asserts an ACK on SDA.
8.
The master sends a data byte or asserts a stop condition.
9.
The slave asserts an ACK on SDA.
10. The master asserts a stop condition on SDA to end
the transaction.
In the ADM1062, the write byte/word protocol is used for three
purposes:
To write a single byte of data to the RAM. In this case, the
command byte is RAM Address 0x00 to RAM Address 0xDF,
and the only data byte is the actual data, as shown in Figure 44.
SLAVE
ADDRESS
RAM
ADDRESS
(0x00 TO 0xDF)
S
W A
DATA
AP
A
24
13
5
8
7
6
Figure 44. Single Byte Write to the RAM


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