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參數(shù)資料
| 型號： | LTC4311ISC6#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 0K |
| 描述： | IC ACCELERATOR SMBUS DL SC70-6 |
| 產(chǎn)品培訓(xùn)模塊： | LTC4310 - Hot-Swappable I²C Isolators |
| 標(biāo)準(zhǔn)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
8
4311fa
APPLICATIONS INFORMATION
A general procedure for selecting RP and RL is as fol-
lows:
1. RL is rst selected based on the I/O protection
requirement. Generally, an RS of 100Ω is sufcient for
high voltage spikes and ESD protection. RON is
determined by the size of the open-drain driver, a large
driver will have a lower RON.
2. The value of RP is determined based on the VOL and
minimum slew rate requirements. The VOLwilldetermine
the smallest resistance value that can be used in a
system, and the minimum slew requirement will bound
the resistance on the upper end. Generally the largest
value of resistance that meets the minimum slew rate
with some margin will be selected.
3. For I2C systems incorporating the LTC4311, the rise
times are met under most loading conditions, due to
the strong accelerator current. The pull-down drivers
are typically low impedance, and therefore fall times
are not generally an issue. Rise and fall time
requirements must be veried using equations 3 and
4 (for an I2C system) or equations 5 to 8 (for an SMBus
system). The value chosen for RP must ensure that
both the rise and fall time specications are met
simultaneously.
I2C Design Example
Given the following conditions and requirements:
V
CC = 3.3V NOMINAL
V
OL = 0.4V MAXIMUM
C
BUS = 600pF
V
ILMAX = 0.99V, VIHMIN = 2.31V
t
r = 0.3s MAXIMUM, t f = 0.3s MAXIMUM
(9)
If an RS of 100Ω is used and the max RON of the driver is
200Ω, then RL = 200Ω + 100Ω = 300Ω. Use equation 1
to nd the required RP to meet VOL.
R
P =
300
Ω(3.3V –0.4V)
0.4V
R
P = 2.175k
(10)
For an I2C system with xed input levels, VILMAX = 1.5V
and VIHMIN = 3V. For I2C systems with VCC related input
levels, VILMAX = 0.3VCC and VIHMIN = 0.7VCC.
CBUS is the total capacitance of the I2C line.
SMBus Rise and Fall Time
Rise time of a SMBus line is derived using equations 5,
6 and 7.
t
r = t1 +t2
(5)
t1 is the time from when the bus crosses the lower slew
rate measurement point, until the bus reaches VTHR and the
accelerators re. The time from when the accelerators re
until the bus reaches the upper slew rate measure point is
given by t2. Equations for t1 and t2 are given here:
t
1 = –RP CBUS ln
V
THR –VCC
V
ILMAX – 0.15V – VCC
(6)
If (VILMAX – 0.15V) > VTHR, then t1 = 0
t
2 = –RP CBUS
ln
V
IHMIN + 0.15V – VCC –RP I PULLUPAC
V
THR –VCC –RP IPULLUP AC
(7)
Fall time of an SMBus line is derived using equation 8:
t
f = RT CBUS
ln
V
IHMIN + 0.15V
V
CC
(R
P + RL )–RL
V
ILMAX – 0.15V
V
CC
(R
P + RL )–RL
(8)
For an SMBus system, VILMAX = 0.8V and VIHMIN = 2.1V.
CBUS is the total bus capacitance of the SMBus line.
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