Hi,
I'm about to setup serial communication between a Siemens MC60 cellular phone and an AtTiny2313V AVR microcontroller. My microcontroller has an input voltage range of 1.8v-5.5v, depending on system clock. The mobile phone is designed with some old battery technlogoly and is run of a 3.7v supply.
My question is: To avoid using voltage/shift/level-converters in-between the UART lines, can I just power the AVR with the voltage I'm seeing on the MC60 Tx line, and then suspect the AVR Tx line to match this?
I don't mean physically powering the AVR from the MC60 Tx line, just using the same voltage level that I'm seeing.
I'm about to setup serial communication between a Siemens MC60 cellular phone and an AtTiny2313V AVR microcontroller. My microcontroller has an input voltage range of 1.8v-5.5v, depending on system clock. The mobile phone is designed with some old battery technlogoly and is run of a 3.7v supply.
My question is: To avoid using voltage/shift/level-converters in-between the UART lines, can I just power the AVR with the voltage I'm seeing on the MC60 Tx line, and then suspect the AVR Tx line to match this?
I don't mean physically powering the AVR from the MC60 Tx line, just using the same voltage level that I'm seeing.