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| 型號： | LTC4261IGN-2#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 24/34頁 |
| 文件大?。?/td> | 361K |
| 描述： | IC CTRLR HOTSWAP W/ADC 28-SSOP |
| 標(biāo)準(zhǔn)包裝： | 49 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 9 V ~ 11.2 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SSOP |
| 包裝： | 管件 |
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LTC4261/LTC4261-2
24
42612fc
I
2
C Interface
The LTC4261/LTC4261-2 feature an I
2
C interface to pro-
vide access to the ADC data registers and four other regis-
ters for monitoring and control of the pass FET. Figure 10
shows a general data transfer format using the I
2
C. The
LTC4261/LTC4261-2 are read-write slave devices and
support SMBus bus Read Byte, Write Byte, Read Word and
Write Word commands. The second word in a Read Word
command will be identical to the first word. The second
word in a Write Word command is ignored. The data for-
mats for these commands are shown in Figures 11 to 14.
Using Opto-Isolators with SDA
The LTC4261/LTC4261-2 split the SDA line into SDAI (in-
put) and SDAO (output) for convenience of opto-coupling
with the host. If opto-isolators are not used then tie SDAI
and SDAO together to form a normal SDA line. When us-
ing opto-isolators, connect the SDAI pin to the output of
the incoming opto-isolator and connect the SDAO pin to
the input of the outgoing opto-isolator (see Figure 2). If
the SDAI and SDAO on the master controller are not tied
together, the ACK bit of SDAO must be returned back to
SDAI. If the ALERT line is used as an interrupt for the
host to respond to a fault in real time, connect the ALERT
pin to an opto-isolator in a way similar to that for the
SDAO pin as shown in Figure 2.
START and STOP Conditions
When the bus is idle, both SCL and SDA must be high. A
bus master signals the beginning of a transmission with
a START condition by transiting SDA from high to low
while SCL is high. When the master has finished com-
municating with the slave, it issues a STOP condition by
transiting SDA from low to high while SCL is high. The
bus is then free for another transmission.
Figure 10. Data Transfer over I
2
C or SMBus
Figure 11. LTC4261 Serial Bus SDA Write Byte Protocol
Figure 12. LTC4261 Serial Bus SDA Write Word Protocol
Figure 13. LTC4261 Serial Bus SDA Read Byte Protocol
Figure 14. LTC4261 Serial Bus SDA Read Word Protocol
APPLICATIONS INFORMATION
SCL
SDA
START
CONDITION
STOP
CONDITION
ADDRESS
R/W
ACK
DATA
ACK
DATA
ACK
1 - 7
8
9
42612 F10
a6 - a0
b7 - b0
b7 - b0
1 - 7
8
9
1 - 7
8
9
P
S
S ADDRESS
0 0 1 a3:a0
42612 F11
FROM MASTER TO SLAVE
FROM SLAVE TO MASTER
A: ACKNOWLEDGE (LOW)
A: NOT ACKNOWLEDGE (HIGH)
R: READ BIT (HIGH)
W: WRITE BIT (LOW)
S: START CONDITION
P: STOP CONDITION
COMMAND
DATA
X X X X b3:b0
0
W
0
0
0
b7:b0
A
A
A P
S ADDRESS
0 0 1 a3:a0
COMMAND
DATA
DATA
X X X X b3:b0
0
W
0
0
0
0
42612 F12
X X X X X X X X
b7:b0
A
A
A
A P
S ADDRESS
0 0 1 a3:a0
0 0 1 a3:a0 1 0
COMMAND
S ADDRESS R A
b7:b0 1
DATA
X X X X b3:b0
0
W
0
0
42612 F13
A
A
A P
S ADDRESS
0 0 1 a3:a0
0 0 1 a3:a0 1 0
COMMAND
S ADDRESS R A
b7:b0
1
DATA
X X X X b3:b0
0
W
0
0
42612 F14
A
0
A
b7:b0
DATA
A
A P
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