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參數(shù)資料
| 型號： | DS2483Q+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 20/29頁 |
| 文件大小： | 0K |
| 描述： | IC I2C TO 1WIRE BRIDGE 8TDFN |
| 產(chǎn)品培訓(xùn)模塊： | Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 系列： | * |
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27
Maxim Integrated
DS2483
Single-Channel 1-Wire Master
with Adjustable Timing and Sleep Mode
Applications Information
SDA and SCL Pullup Resistors
SDA is an open-drain output on the DS2483 that requires
a pullup resistor to realize high-logic levels. Because the
DS2483 uses SCL only as input (no clock stretching), the
master can drive SCL either through an open-drain/col-
lector output with a pullup resistor or a push-pull output.
Pullup Resistor RP Sizing
According to the I2C specification, a slave device must
be able to sink at least 3mA at a VOL of 0.4V. This DC
condition determines the minimum value of the pullup
resistor: RP(MIN) = (VCI2C - 0.4V)/3mA. With an I2C pul-
lup voltage VCI2C of 5.5V, the minimum value for the pul-
shows how the minimum pullup resistor changes with the
operating (pullup) voltage.
For I2C systems, the rise time and fall time are measured
from 30% to 70% of the pullup voltage. The maximum
bus capacitance, CB, is 400pF. The maximum rise time
must not exceed 300ns. Assuming maximum rise time,
the maximum resistor value at any given capacitance CB
is calculated as: RP(MAX) = 300ns/(CB x ln(7/3)). For a
bus capacitance of 400pF, the maximum pullup resistor
would be 885I.
Because an 885I pullup resistor, as would be required
to meet the rise time specification at 400pF bus capaci-
tance, is lower than RP(MIN) at 5.5V, a different approach
is necessary. The “Maximum Load at Minimum RP Fast
Mode” line in Figure 10 is generated by first calculating
the minimum pullup resistor at any given operating volt-
age (“Minimum RP” line) and then calculating the respec-
tive bus capacitance that yields a 300ns rise time.
Only for pullup voltages of 3V and lower can the maxi-
mum permissible 400pF bus capacitance be maintained.
A reduced 300pF bus capacitance is acceptable for 4V
and lower pullup voltages. For fast mode operation at
any pullup voltage, the bus capacitance must not exceed
200pF. The corresponding pullup resistor value at the
voltage is indicated by the “Minimum RP” line.
Figure 10. I2C Fast Mode Pullup Resistor Selection Chart
MINIMUM RP
MAXIMUM LOAD AT MINIMUM RP FAST MODE
2000
MINIMUM
R
P(
)
LOAD
(pF)
PULLUP VOLTAGE (V)
1600
1200
800
400
12
34
5
0
500
400
300
200
100
0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2483R+T | 功能描述:I2C 接口集成電路 Single-Channel 1-Wire Master RoHS:否 制造商:NXP Semiconductors 電源電壓-最大:5.5 V 電源電壓-最小:2.3 V 最大工作頻率:400 KHz 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-16 |
| DS2483R+U | 功能描述:接口 - 專用 SINGLE-CH 1-WIRE MASTER RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:BGA-59 |
| DS2484Q+T | 制造商:Maxim Integrated Products 功能描述: |
| DS2484R+T | 制造商:Maxim Integrated Products 功能描述: |
| DS2490 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:USB to 1-Wire Bridge Chip |
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