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參數(shù)資料
| 型號： | LTC4310IMS-2#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 231K |
| 代理商： | LTC4310IMS-2#TRPBF |
LTC4310-1/LTC4310-2
10
431012fa
SDA, SCL Bus Pull-Up Resistor Value Selection
When the SDA (or SCL) bus is rising between 0V and
0.35 VCC, the LTC4310 controls the bus rise rate to
(0.35 VCC)/900ns for the LTC4310-1 and to (0.35 VCC)/
300ns for the LTC4310-2. Users must quantify their
parasitic bus capacitance, CBUS, and choose a bus pull-
up resistor, RBUS, based on their bus pull-up supply
voltage and maximum bus switching frequency to en-
sure that each bus rises faster than the controlled rise
rate. For bus frequencies up to 100kHz, choose the
LTC4310-1 and refer to Figure 2 for the maximum pull-up
resistance to use. For bus frequencies between 100kHz
and 400kHz, choose the LTC4310-2 and refer to Figure 3
for the maximum pull-up resistance to use. Be sure to
include worst-case resistor tolerance when selecting
resistor value.
applicaTions inForMaTion
Rise Time Accelerators
The LTC4310’s rise time accelerator circuitry on the SDA
and SCL lines turns on during rising edges to reduce the
bus rise time. When the bus has risen above 0.45 VCC,the
LTC4310 turns on a strong, slew-limited pull-up current,
IBOOST,tohelpevenheavilyloadedbusesmeettherisetime
specifications.SeetheTypicalPerformanceCharacteristics
section for the rise time accelerator pull-up current as a
function of temperature and bus capacitance. When either
the bus has risen above (VCC – 1V) or 300ns after the
pull-up current has turned on (whichever comes first), the
LTC4310 deactivates its pull-up current to deter fighting
withthesubsequentfallingedge.Usersmustensurethatthe
buspull-upsupplyvoltageVBUS≥VCC,sothattheaccelera-
tors do not overdrive the SDA, SCL bus and source current
intoVBUS.Therisetimeacceleratorsaredeactivatedduring
start-up,thermalshutdown, shutdownandafterdisconnec-
tion due to a stuck bus or failure to receive a transmission
within 4.6ms.
Figure 2. Maximum SDA,SCL Bus Pull-Up Resistor Value as a
Function of Parasitic Bus Capacitance for the LTC4310-1
Figure 3. Maximum SDA,SCL Bus Pull-Up Resistor Value as
a Function of Parasitic Bus Capacitance for the LTC4310-2
CBUS(MAX) (pF)
1
R
BUS(MAX)
(k)
10
100
1000
431012 F02
VCC = 5V
VCC = 3.3V
8
10
12
14
16
6
4
2
0
18
CBUS(MAX) (pF)
1
R
BUS(MAX)
(k)
10
100
1000
431012 F03
8
10
12
14
16
6
4
2
0
18
VCC = 5V
VCC = 3.3V
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