ZHCSI90E December 2017 – October 2019 ISO1042
PRODUCTION DATA.
请参考 PDF 数据表获取器件具体的封装图。
Pullup and pulldown resistors should be used on critical pins to place the device into known states if the pins float. The TXD pin should be pulled up through a resistor to the VCC1 pin to force a recessive input level if the microprocessor output to the pin floats.