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參數(shù)資料
| 型號： | LTC4311ISC6#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ACCELERATOR SMBUS DL SC70-6 |
| 產(chǎn)品培訓(xùn)模塊： | LTC4310 - Hot-Swappable I²C Isolators |
| 標準包裝： | 2,500 |
| 類型： | SMBus 加速器 |
| Tx/Rx類型： | I²C Logic |
| 電源電壓： | 1.6 V ~ 5.5 V |
| 電流 - 電源： | 300µA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-TSSOP，SC-88，SOT-363 |
| 供應(yīng)商設(shè)備封裝： | SC-70-6 |
| 包裝： | 帶卷 (TR) |
LTC4311
7
4311fa
Selecting the values of RS and RP
The typical conguration for the data bus for a 2-wire bus
is shown in Figure 1. The parameters RP and RS should be
chosen carefully. A description of the process for choosing
the values of RP and RS follows.
An external pull-up resistor RP is required in each bus
line to supply a steady state pull-up current if the bus is
at logic zero. This pull-up current is used for slewing the
bus line during the initial portion of the positive transition
in order to activate the LTC4311 pull-up current.
Using an external pull-up resistor RP to supply steady
state pull-up current provides the freedom to adjust rise
time versus fall time as well as dening the low state
logic-level (VOL).
For I/O stage protection from ESD and high voltage spikes
on the bus, a series resistor RS (Figure 1) is sometimes
added to the open drain driver of the bus agents.
RS
VCC
CBUS
Bus
RON
4311 F01
DATA
IN
LTC4311
DYNAMIC
CURRENT
PULL-UP
DATA
OUT
RP
Figure 1. Typical 2-Wire Bus Conguration
APPLICATIONS INFORMATION
Low State Noise Margin
A low value of VOL, the low state logic level, is desired
for good noise margin. VOL is calculated as follows:
V
OL =
R
L VCC
R
L + RP
(1)
RL is the series sum of RS and RON, the on resistance of
the open-drain driver.
Increasing the value of RP decreases the value of VOL.
Increasing RL increases the value of VOL.
Initial Slew Rate
The initial slew rate, SR, of the bus is determined by:
SR
=
V
CC –VOL
R
P CBUS
(2)
SR must be greater than SRTHRESH, the LTC4311 slew rate
detector threshold (0.5V/μs max), in order to activate the
pull-up current.
I2C Rise and Fall Time
Rise time of an I2C line is derived using equation 3.
t
r = – Rp CBUS
ln
V
IHMIN –VCC –Rp IPULLUP AC
V
ILMAX –VCC –Rp IPULLUP AC
(3)
Fall time of an I2C line is derived using equation 4.
t
f = RT CBUS ln
V
IHMIN
V
CC
(R
P + RL )–RL
V
ILMAX
V
CC
(R
P + RL )–RL
(4)
where RT is the parallel equivalent of RP and RL.
Both the values of RP and RS must be chosen carefully
to meet the low state noise margin and all bus timing
requirements.
A discussion of the electrical parameters affected by the
values of RS and RP, as well as the general procedure for
selecting the values of RS and RP follows.
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