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[DPRG] Sanity Check: Connecting 3.3V Accelerometer to 5V AVR
Subject: [DPRG] Sanity Check: Connecting 3.3V Accelerometer to 5V AVR
From: jl_harris at juno.com
jl_harris at juno.com
Date: Mon Dec 10 16:14:34 CST 2007
DPRG,
I'm connecting a (+3.3V) 3-axis accelerometer (Freescale MMA7260Q) to my (+5V) AVR ATmega168. Both the devices will share a common ground and all the accelerometer's select/mode lines are connected to pullup resistors to +3.3V or directly to ground.
My mind tells me I can connect the accelerometer's 3 analog outputs (X,Y,Y axes range: 0V to 3.3V) directly to the analog inputs (ADC0 thru ADC2) of my (5V powered) AVR.
However, my mind has misled me before so I wanted a "Sanity Check" before I power up and let all the wonderful magic smoke out of my cool MEMS Accelerometer.
So what do you all think?? Can I do this without level converters on the accelerometer analog outputs?
Thanks,
James
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