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嗯插屁（NXP）I2C-Bus Specification and User Manual Revision 6.06 K+ T$ r, ]0 W& y' n, x4 A
The switched pull-up circuit in Figure 44 is for a supply voltage of VDD = 5 V ± 10 % and a maximum capacitive load of 400 pF. Since it is controlled by the bus levels, it needs no additional switching control signals. During the rising/falling edges, the bilateral switch in the HCT4066 switches pull-up resistor Rp2 on/off at bus levels between 0.8 V and 2.0 V. Combined resistors Rp1 and Rp2 can pull up the bus line within the maximum specified rise time (tr) of 300 ns.: `. d2 ?. O+ S2 }2 R: \' O7 D0 W8 K: H
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发表于 2017-11-24 20:26
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发表于 2017-11-25 15:41
