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参数资料
| 型号： | DS2490Y |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/50页 |
| 文件大小： | 0K |
| 描述： | IC BRIDGE CLIP USB TO 1-W 24SOIC |
| 标准包装： | 1,000 |
| 应用： | USB |
| 接口： | 1 线 |
| 电源电压： | 3 V ~ 5.5 V |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
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DS2490
15 of 50
STRONG PULLUP DURATION—This command is used to set the time duration of a 1-Wire strong
pullup. As shown in Table 7, the time is controlled with an unsigned 8-bit binary number between 0x00
and 0xFE which specifies the duration in multiples of 16ms. A value of 0x01 specifies 16ms, 0x02 equals
32ms, etc. A value of 0x00 specifies infinite duration. Parameter value 0xFF is reserved and will cause
the device to deliver a pullup duration of <1μs. To terminate an infinite duration pullup use either the
HALT EXECUTION WHEN DONE or HALT EXECUTION WHEN IDLE Control commands as
described in Appendix 1. The DS2490 power-up default strong pullup duration register value is 512ms.
Strong Pullup Duration Codes Table 7
Value
Nominal Strong Pullup Duration
0x00
infinite
0x01
16ms
0x02
32ms
…
0xFE
4.064s
0xFF
reserved
PULLDOWN SLEW RATE—This command is used to select the pulldown slew rate for 1-Wire bus
Flexible Speed operation; eight pulldown slew rates are possible. The parameter codes to select the
desired or required slew rate are as listed in Table 8. The slew rate numbers in the table represent nominal
values. The nominal pulldown slew rate for Regular speed is 0.83V/
s and for Overdrive speeds it is
15V/
s. The DS2490 decodes the three LSBs of the slew rate code. Sending a code other than the defined
values in Table 8 will result in undefined behavior. The DS2490 pulldown slew rate power-up default
value for Flexible speed is 0.83V/
s.
Flexible Speed Pulldown Slew Rate Codes Table 8
Code
Nominal Pulldown slew rate
0x0
15V/
s
0x1
2.20V/
s
0x2
1.65V/
s
0x3
1.37V/
s
0x4
1.10V/
s
0x5
0.83V/
s
0x6
0.70V/
s
0x7
0.55V/
s
0x8..0xF
reserved
WRITE-1 LOW TIME—This command is used to select the Write-1 low time for 1-Wire bus Flexible
speed operation; eight Write-1 low time durations are possible. The parameter codes to select the desired
or required low time are as listed in Table 9. The low time numbers in the table represent nominal values.
The nominal Write-1 Low Time for Regular speed is 4
s, at Overdrive speed it is 1.4s. The DS2490
decodes the three LSBs of the low time code. Sending a code other than the defined values in Table 9 will
result in undefined behavior. The DS2490 Write-1 Low Time power-up default value for Flexible speed is
8
s.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2490Y+ | 制造商:Maxim Integrated Products 功能描述:USB TO 1-WIRE BRIDGE 24SOIC W - Tape and Reel |
| DS24B33 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
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