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参数资料
| 型号： | DS2482X-100+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC MASTER I2C-1WIRE 1CH 9-WLP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 控制器类型： | I²C 总线控制器 |
| 接口： | I²C |
| 电源电压： | 2.9 V ~ 5.5 V |
| 电流 - 电源： | 750µA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 9-WFBGA，WLBGA |
| 供应商设备封装： | 9-WLP |
| 包装： | 带卷 (TR) |
Single-Channel 1-Wire Master
Applications Information
SDA and SCL Pullup Resistors
SDA is an open-drain output on the DS2482-100 that
requires a pullup resistor to realize high-logic levels.
Because the DS2482-100 uses SCL only as input (no
clock stretching), the master can drive SCL either
through an open-drain/-collector 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 as:
RP(MIN) = (VCC - 0.4V)/3mA
With an operating voltage of 5.5V, the minimum value
for the pullup resistor is 1.7k
Ω. The “MINIMUM RP” line
in Figure 11 shows how the minimum pullup resistor
changes with the operating voltage.
For I2C systems, the rise time and fall time are mea-
sured from 30% to 70% of the pullup voltage. The maxi-
mum bus capacitance, CB, is 400pF. The maximum rise
time must not exceed 1000ns at standard speed and
300ns at fast speed. Assuming maximum rise time, the
maximum resistor value at any given capacitance CB is
calculated as:
RPMAXS = 1000ns/[CB x ln(7/3)] (standard speed)
RPMAXF = 300ns/[CB x ln(7/3)] (fast speed)
For a bus capacitance of 400pF, the maximum pullup
resistor values are 2.95k
Ω at standard speed and 885Ω
at fast speed. A value between 1.7k
Ω and 2.95kΩ
meets all requirements at standard speed.
Because an 885
Ω pullup resistor, as would be required
to meet the rise time specification at fast speed and
400pF bus capacitance, is lower than RP(MIN) at 5.5V, a
different approach is necessary. The “MAX LOAD AT
MIN RP FAST MODE” line in Figure 11 is generated by
first calculating the minimum pullup resistor at any
given operating voltage (“MINIMUM RP” line) and then
calculating the respective bus capacitance that yields a
300ns rise time.
Only for pullup voltages of 3V and lower can the maximum
permissible bus capacitance of 400pF be maintained. A
1-Wire Triplet (To Perform a Search ROM Function on the 1-Wire Line)
Case A: 1-Wire Idle (1WB = 0), No Busy Polling
The idle time is needed for the 1-Wire function to complete. Then access the device in read mode to get the
result from the 1-Wire Triplet command.
Case B: 1-Wire Idle (1WB = 0), Busy Polling Until the 1-Wire Command is Completed
When 1WB has changed from 1 to 0, the Status Register holds the valid result of the 1-Wire Triplet command.
Case C: 1-Wire Busy (1WB = 1)
The master should stop and restart as soon as the DS2482-100 does not acknowledge the command code.
S
AD,0
A
1WT
A\
P
S
AD,0
A
1WT
A
<byte>
A
Sr
AD,1
A
<byte>
A
<byte>
A\
P
REPEAT UNTIL THE 1WB BIT
HAS CHANGED TO 0.
S
AD,0
A
1WT
A
<byte>
A
P
(Idle)
S
AD,1
A
<byte>
A\
P
I2C Communication Examples (continued)
DS2482-100
Maxim Integrated
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2482X-101+T | 功能描述:接口 - 专用 1-Wire Master w/ Sleep Mode RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| DS2482X-101+U | 功能描述:接口 - 专用 SNGL-CH 1-WIRE MASTER w/ SLP MODE RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| DS2483 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Channel 1-Wire Master with Adjustable Timing and Sleep Mode |
| DS2483Q+T | 功能描述:I2C 接口集成电路 Single-Channel 1-Wire Master RoHS:否 制造商:NXP Semiconductors 电源电压-最大:5.5 V 电源电压-最小:2.3 V 最大工作频率:400 KHz 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-16 |
| DS2483Q+U | 功能描述:I2C 接口集成电路 SINGLE-CH 1-WIRE MASTER RoHS:否 制造商:NXP Semiconductors 电源电压-最大:5.5 V 电源电压-最小:2.3 V 最大工作频率:400 KHz 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-16 |
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