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TPS65910 VDD3电压如何开启

Other Parts Discussed in Thread: TPS65910, AM3352

TPS65910给AM3352供电,用到VDD3这个升压为5V的SMPS,没有对PMU进行编程,输出升压值不正确。

设计电路形式大致为:参考数据手册第二页的原理图,电感4.7uH,整流二极管RV551,输入电压3.6V(VCCAUX_3V3也为该值),输出电压值为3.5V。

其EVM demo提到VDD3输出需具备两个条件:1、VCCAUX_3V3至少3.3V以上;2、配置相关寄存器。

其中第1点已满足,第2点查看了相关数据手册,EN1_SMPS_ASS_REG寄存器复位值为0x00,因此VDD3_EN1不起作用,如何设置相关寄存器呢?