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lidean 发表于 2012-12-3 17:35 3 K( y3 U2 e% d+ |$ ~$ {
After power-on reset, this pin is defined as enable (EN). To enable active high, the I2C command can ... & b! p& R( P/ N! \6 z4 c
这个芯片有两种启动方式,外部默认的EN管脚使能和I2C配置开启,具体在datasheet的首页就有提示
$ R3 b$ [' P5 i mThe ADP5020 can be activated via an I2C interface or through a dedicated enable input.
/ ~2 F/ i4 H& q$ a以及后面的SEQUENCER有提示
/ H3 n2 u9 ^# u7 |. k! f2 PThe sequencer is enabled after a low-to-high transition of the
" D' t7 X1 R# j; [& lenable pin (EN). When EN is low or programmed as an output, the * h j; A! ?. _% _
sequencing is controlled and timed by the application processor w; w3 ], C+ G; ^
via the I2C commands.
3 J" l0 t$ j, L) B$ ]# M不过当初设计的时候这个EN管脚确实应该通过电阻下拉方便后面的调试。 |
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