参数资料
型号: ADP1048ARQZ-R7
厂商: Analog Devices Inc
文件页数: 35/84页
文件大小: 0K
描述: IC DGTL PFC CTRLR 24QSOP
标准包装: 1
模式: 平均电流
频率 - 开关: 30kHz ~ 400kHz
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
供应商设备封装: 24-QSOP
包装: 标准包装
其它名称: ADP1048ARQZ-R7DKR
Data Sheet
DATA TRANSFER
Format Overview
The PMBus slave follows the transfer protocol of the SMBus
specification, which is based on the fundamental transfer
protocol format of the Philips I 2 C Bus Specification , dated
January 2000. Data transfers are byte wide, lower byte first.
Each byte is transmitted serially, most significant bit (MSB)
first. A typical transfer is diagrammed in Figure 35. See the
SMBus and I 2 C specifications for an in-depth discussion of
the transfer protocols.
ADP1047/ADP1048
“A” represents the ACK (acknowledge) bit. The ACK bit is typi-
cally active low (Logic 0) if the transmitted byte is successfully
received by a device. However, when the receiving device is the
bus master, the acknowledge bit for the last byte read is a Logic 1,
indicated by A.
Command Overview
Data transfer using the PMBus slave is established using PMBus
commands. The PMBus specification requires that all PMBus
commands start with a slave address with the R/W bit cleared
(set to 0), followed by the command code. All PMBus commands
S
7-BIT SLAVE
ADDRESS
W
A
8-BIT DATA
A
P
supported by the ADP1047 / ADP1048 follow one of the protocol
types shown in Figure 36 through Figure 42 .
MASTER TO SLAVE
SLAVE TO MASTER
Figure 35. Basic Data Transfer
Figure 35 through Figure 42 use the following abbreviations:
S = start condition
Sr = repeated start condition
P = stop condition
R = read bit
W = write bit
A = acknowledge bit (0)
A = acknowledge bit (1)
The PMBus slave module also supports manufacturer-specific
extended commands. These commands follow the same protocol
as the standard PMBus commands. However, the command
code consists of the following two bytes:
? The command code extension, 0xFE
? The extended command code, 0x00 to 0xFF
Using the manufacturer-specific extended commands, the
PMBus device manufacturer can add an additional 256
manufacturer-specific commands to its PMBus command set.
S
SLAVE ADDRESS
W
A
COMMAND CODE
A
P
MASTER TO SLAVE
SLAVE TO MASTER
Figure 36. Send Byte Protocol
S
SLAVE
ADDRESS
W
A
COMMAND
CODE
A
DATA BYTE
A
P
MASTER TO SLAVE
SLAVE TO MASTER
Figure 37. Write Byte Protocol
S
SLAVE
ADDRESS
W
A
COMMAND
CODE
A
DATA BYTE
LOW
A
DATA BYTE
HIGH
A
P
MASTER TO SLAVE
SLAVE TO MASTER
Figure 38. Write Word Protocol
S
SLAVE
ADDRESS
W
A
COMMAND
CODE
A Sr
SLAVE
ADDRESS
R
A
DATA BYTE
A
P
MASTER TO SLAVE
SLAVE TO MASTER
Figure 39. Read Byte Protocol
S
SLAVE
ADDRESS
W
A
COMMAND
CODE
A Sr
SLAVE
ADDRESS
R
A
DATA BYTE
LOW
A
DATA BYTE
HIGH
A
P
MASTER TO SLAVE
SLAVE TO MASTER
Figure 40. Read Word Protocol
S
SLAVE
ADDRESS
W
A
COMMAND
CODE
A
BYTE COUNT
=N
A
DATA BYTE 1
A
DATA BYTE N
A
P
MASTER TO SLAVE
SLAVE TO MASTER
Figure 41. Block Write Protocol
Rev. 0 | Page 35 of 84
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