题目

英语翻译
Circuit Description
The network driver (Figure 1) consists of a pulldown section (Q1,R1,C1,R5) and a pullup section (Q2,R2,C2,R6).
A third transistor and surrounding components (Q3,C4,R7) form a strong pullup section to supply extra power for
devices such as EEPROMs,or temperature sensors.This "strong-pullup" function is not discussed in this document.Of
the three transistors,a maximum of one is conducting at any time.When there is no 1-Wire communication ("idle"
state),all three transistors are nonconducting.
The series path of R4,R1 and R3 provides the standard 1-Wire pullup to VCC.With this circuit,the total pullup
resistance is approximately 1kΩ.This value applies when the 1-Wire line is idle.Since R4 is connected to the drain of
Q1,the current flowing through it when Q1 is conducting does not affect the lowlevel voltage on the 1-Wire line.R4
+R1+R3 together with the load or "weight" of the 1-Wire network determine the speed a

提问时间：2020-10-29

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