參數(shù)資料
型號: DS2490S
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: Bus Controller
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PDSO24
封裝: 0.300 INCH, SO-24
文件頁數(shù): 34/51頁
文件大小: 444K
代理商: DS2490S
DS2490
4 of 50
provided by the DS2490 supports all 1-Wire devices manufactured by Dallas Semiconductor as well as
the various 1-Wire bus topologies simple multi-drop to complex 1-Wire Network. Example (b) and (c) in
Figure 2 are variations of example (a) in which the DS2490 is embedded in the host computer or a USB
HUB.
DS2490 APPLICATION EXAMPLES Figure 2
1-WIRE INTERFACE CONTROLLER
1-Wire communication commands sent to the DS2490 are ultimately processed by the 1-Wire interface
controller. One of the tasks of the interface controller is to actively shape the edges of the 1-Wire
communication waveforms. This speeds up the recharging of the 1-Wire bus (rising edges) and reduces
ringing of long lines (falling edges). The circuitry for shaping rising edges is always active. The slew rate
of falling edges is actively controlled only at flexible speed and requires the parameter for slew rate
control being different from its power-on default value. See the MODE COMMANDS section for
parameter control and power-on defaults.
All Rising Edges
The active pullup of the rising edges reduces the rise time on the 1-Wire bus significantly compared to a
simple resistive pullup. Figure 3 shows how the DS2490 is involved in shaping a rising edge.
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