I am looking for maximum allowed logic high voltage for HL7800 on UART pins, I am trying to interface HL7800 to a controller which got logic high voltage level as 3.3v, need to know the maximum allowed voltage on RX,TX,CTS and RTS pins only.
According to the document, the maximum allowed voltage on the RX, TX, CTS and RTS pins is 1.8V (VGPIO).
For more detail, you can refer to Table 3-3: Digital I/O Electrical Characteristics (1.80V) on page 27 and
Table 4-7: UART1 Pin Description on page 46.
The attached document below:
Sierra Wireless™ HL78xx Product Technical Specification