參數(shù)資料
型號(hào)： EVAL-ADM1066LFEB
廠商： Analog Devices, Inc.
元件分類： ADC
英文描述： Multisupply Supervisor/Sequencer with Margining Control and Auxiliary ADC Inputs
中文描述： Multisupply監(jiān)/同裕量控制和輔助ADC輸入序列
文件頁(yè)數(shù)： 27/32頁(yè)
文件大小： 861K
代理商： EVAL-ADM1066LFEB
ADM1066
Rev. 0 | Page 27 of 32
9
0
1
9
9
1
1
9
1
START BY
MASTER
ACK. BY
SLAVE
ACK. BY
MASTER
ACK. BY
MASTER
NO ACK.
FRAME 2
DATA BYTE
FRAME 1
SLAVE ADDRESS
FRAME N
DATA BYTE
FRAME 3
DATA BYTE
SCL
SDA
R/W
STOP
BY
MASTER
SCL
(CONTINUED)
SDA
(CONTINUED)
D7
A0
A1
1
1
1
0
0
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
Figure 37. General SMBus Read Timing Diagram
0
SCL
SDA
P
S
S
P
t
SU;STO
t
HD;STA
t
SU;STA
t
SU;DAT
t
HD;DAT
t
HD;STA
t
HIGH
t
BUF
t
LOW
t
R
t
F
Figure 38. Serial Bus Timing Diagram
SMBus Protocols for RAM and EEPROM
The ADM1066 contains volatile registers (RAM) and nonvola-
tile registers (EEPROM). User RAM occupies address locations
from 0x00 to 0xDF; EEPROM occupies addresses from 0xF800
to 0xFBFF.
Data can be written to and read from both RAM and EEPROM
as single data bytes. Data can be written only to unprogrammed
EEPROM locations. To write new data to a programmed loca-
tion, it 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 the diagrams:
S
P
R
W
A
A
Start
Stop
Read
Write
Acknowledge
No acknowledge
The ADM1066 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 ACK on SDA.
4.
The master sends a command code.
5.
The slave asserts ACK on SDA.
6.
The master asserts a stop condition on SDA and the
transaction ends.
In the ADM1066, the send byte protocol is used for two
purposes:
To write a register address to RAM for a subsequent single
byte read from the same address, or a block read or write
starting at that address, as shown in Figure 39.
0
2
4
1
3
SLAVE
ADDRESS
REGISTER
ADDRESS
(0x00 TO 0xDF)
S
W
A
A
5
6
P
Figure 39. Setting a RAM Address for Subsequent Read
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