參數(shù)資料
型號(hào)： LTC1699-80
廠商： Linear Technology Corporation
英文描述： SMBus VID Voltage Programmers(SMBus 接口VID電壓編程器)
中文描述： VID電壓編程的SMBus（西元的SMBus接口電壓編程器）
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 250K
代理商： LTC1699-80
LTC1699 Series
12
APPLICATIU
W
U
U
Table 2. LTC1699-80, LTC1699-81 and LTC1699-82
Command Bits
C7
C6
C5
0
0
0
0
1
1
0
0
1
0
1
0
COMMAND
On
Off
Setup
Read-Back
PROTOCOL
Write Word
Write Word
Write Word
Read Word
Write Word Protocol
Each Write Word protocol (Figure 2) begins with a start bit
(S) and ends with a stop bit (P). As shown in the Timing
Diagram the start and stop bits are defined as high to low
and low to high transitions respectively, while SCL is high.
In between the start and stop bits, the microprocessor
transmits four bytes to the LTC1699-80, LTC1699-81 or
LTC1699-82. These are the address byte, an 8-bit com-
mand code and two data bytes. The LTC1699-80,
LTC1699-81 and LTC1699-82 sample each bit at the rising
edges of the SCL clock.
When the microprocessor issues a start bit, all the slave
devices on the bus, including the LTC1699-80, LTC1699-81
or LTC1699-82 clock in the address byte, which consists
of a 7-bit slave address and the R/W bit (set to 0). If the
slave address from the microprocessor does not match
the internal hardwired address, the LTC1699-80,
LTC1699-81 or LTC1699-82 returns to an idle state and
waits for the next start bit. If the slave address matches,
the LTC1699-80, LTC1699-81 or LTC1699-82 acknowl-
edges by pulling the SDA line low for one clock cycle after
the address byte. After detecting the acknowledgement bit
(A), the microprocessor transmits the second byte or
command code. The command code identifies the type of
Write Word protocol as Setup, On or Off (Table 2). The
Setup protocol is used to load two resistor divider settings
into Register 0 and 1. The On and Off protocols turn the
converters on or off in conjunction with the VRON pin.
Once all 8 bits of the command code are clocked in, the
LTC1699-80, LTC1699-81 or LTC1699-82 issues a sec-
ond acknowledgement bit to the microprocessor. After
detecting the acknowledgement bit, the microprocessor
transmits two data bytes. Each data byte is acknowledged
in turn for all three Write Word protocols but is only
latched into Register 0 or 1 in Setup protocol. This
prevents previously loaded settings from accidentally
being changed. The first or Data Low byte is loaded into
Register 0. The second or Data High byte is loaded into
S 1110001
000XXXXX
A
DON’T CARE
A
DON’T CARE
UPDATE DCON
SLAVE
ADDRESS
ON
COMMAND
DATA LOW
(REGISTER 0)
DATA HIGH
(REGISTER 1)
A P
S 1110001
011XXXXX
A
DON’T CARE
A
DON’T CARE
UPDATE DCON
SLAVE
ADDRESS
OFF
COMMAND
DATA LOW
(REGISTER 0)
DATA HIGH
(REGISTER 1)
A P
S 1110001
001XXXXX
A
VID4 VID3 VID2 VID1 VID0
X X X
A
A
A
A
UPDATE DCON
SLAVE
ADDRESS
SETUP
COMMAND
DATA HIGH
(REGISTER 1)
DATA LOW
(REGISTER 0)
A P
DATA LOW
LATCHED
DATA HIGH
LATCHED
COMMAND
LATCHED
VID4 VID3 VID2 VID1 VID0
X X X
S 1110001 R/W
R/W
R/W
R/W
S 1110010
010XXXXX
A
VID4 VID3 VID2 VID1 VID0
0 0
RD A
A
A
SLAVE
ADDRESS
READ-BACK
COMMAND
DATA HIGH
(REGISTER 1)
DATA LOW
(REGISTER 0)
A P
DATA HIGH
LOADED
DATA LOW
LOADED
STOP
(IGNORED)
COMMAND
LATCHED
DCON
0 0
DCON
VID4 VID3 VID2 VID1 VID0
Figure 2. Write Word and Read Word Protocols
相關(guān)PDF資料
PDF描述
LTC1699-81 SMBus VID Voltage Programmers(SMBus接口 VID電壓編程器)
LTC1699-82 SMBus VID Voltage Programmers(SMBus 接口VID電壓編程器)
LTC1701 Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70
LTC1701ES5 Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70
LTC1703 Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70
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