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參數(shù)資料
| 型號： | DS2490Y |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/50頁 |
| 文件大小： | 0K |
| 描述： | IC BRIDGE CLIP USB TO 1-W 24SOIC |
| 標準包裝： | 1,000 |
| 應用： | USB |
| 接口： | 1 線 |
| 電源電壓： | 3 V ~ 5.5 V |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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DS2490
14 of 50
As listed in Table 5 and summarized previously, there are eight Mode commands. The USB control
transfer setup packet coding to transmit these commands is detailed in Appendix 3. Mode commands are
immediately processed by the DS2490 when they are received. The DS2490 power-on default values for
these parameters are as listed in Table 11. Each command and parameter control is detailed in the
following paragraphs.
Mode Command Set Summary Table 5
Command
Function
ENABLE PULSE
Enable/disable 1-Wire strong pullup pulse to 5V.
ENABLE SPEED
CHANGE
Enable/disable dynamic change of the 1-Wire speed through a
communication command.
1-WIRE SPEED
Communication speed of the 1-Wire bus.
STRONG PULLUP
DURATION
Duration of 1-Wire strong pullup.
PULLDOWN SLEW
RATE
Slew rate of 1-Wire pulldown.
WRITE-1 LOW TIME
Duration of 1-Wire Write-1 low time.
DSOW0 RECOVERY
TIME
Recovery time for the 1-Wire data sample offset / Write-0 transaction.
Mode Command Set Descriptions:
ENABLE PULSE—This command is used to enable or disable a 1-Wire strong pullup pulse to 5V. One
bit position in the parameter byte is used to control the enabled/disabled state for the pulse. The pulse is
enabled when the respective bit is set to a 1 and disabled when set to a 0. The DS2490 power-up default
state for strong pullup is disabled.
ENABLE SPEED CHANGE—This command is used to enable or disable a 1-Wire communication
speed change. Enabled when a TRUE parameter value is passed with the command, disabled with a
FALSE. The DS2490 power-up default state for speed change is disabled.
1-WIRE SPEED—This command is used to set the speed of 1-Wire communication; three settings are
possible. The parameter codes to select the desired or required speed are as listed in Table 6. As shown,
speed codes 0x3..0xF are undefined. The DS2490 decodes the 3 LSBs of the 1-Wire speed code. Sending
a code other than the defined values in Table 6 will result in undefined behavior. The DS2490 power-up
default communication speed is regular.
1-Wire Bus Speed Codes Table 6
Code
Speed
Data Rate
0x0
Regular
65
s time slot (15.4kbps)
0x1
Flexible
65
s to 72s time slot
(13.9kbps to 15.4kbps)
0x2
Overdrive 10
s time slot (100kbps)
0x3..0xF
reserved
undefined
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相關代理商/技術參數(shù) |
參數(shù)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 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
| DS24B33 TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:1-Wire 4Kb EEPROM |
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