Datasheet

422
ATmega16U4/32U4 [DATASHEET]
Atmel-7766J-USB-ATmega16U4/32U4-Datasheet_04/2016
33.2 ATmega32U4
Notes: 1. For more information on running the USB from internal RC oscillator consult application note AVR291: 8MHz Internal Oscillator Calibration for USB Low
Speed on Atmel ATmega32U4RC.
2. USB operation from internal RC oscillator is only guaranteed for 0°C to 40°C.
3. These parts are shipped with no USB bootloader pre-programmed.
Speed [MHz] Power Supply Ordering Code Default Oscillator Package Operation Range
16
2.7 - 5.5V
ATmega32U4-AU External XTAL
44ML
Industrial (-40° to +85°C)
ATmega32U4RC-AU Internal Calib. RC
ATmega32U4-MU
(1)(2)(3)
External XTAL
44PW
ATmega32U4RC-MU
(1)
(2) (3)
Internal Calib. RC
Package Type
44ML
ML, 44 - Lead, 10 x 10mm Body Size, 1.0mm Body Thickness
0.8mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP)
44PW
PW, 44 - Lead 7.0 x 7.0mm Body, 0.50mm Pitch
Quad Flat No Lead Package (QFN)