AT90USB162 Atmel Corporation, AT90USB162 Datasheet - Page 187

• Manufacturer Part Number: AT90USB162
• Manufacturer: Atmel Corporation

Specifications of AT90USB162

• Flash (kbytes): 16 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 22
• Ext Interrupts: 21
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19.3.3
19.4
19.4.1
19.4.2
7707F–AVR–11/10
General Operating Modes
Design guidelines
Introduction
Power-on and reset
The USB controller is disabled and reset after a hardware reset generated by:
But another available and optionnal reset source is :
In this case, the USB controller is reset, but not disabled (so that the device remains attached).
The next diagram explains the USB controller main states on power-on:
Figure 19-7. USB controller states after reset
When the USB controller is in reset state:
• Serial resistors on USB Data lines must have 22 Ohms value (
• Traces from the input USB receptable (or from the cable connection in the case of a tethered
• Voltage transcient / ESD suppressors may also be used to prevent USB pads to be damaged
• U
• A 10µF capacitor is highly recommended on VBUS line
• USBE is not set
device) to the USB microcontroller pads should be as short as possibles, and follow
differential traces routing rules (same length, as near as possible, avoid vias accumulation).
by external disturbances.
cap
– Power on reset
– External reset
– Watchdog reset
– Brown out reset
– debugWIRE reset
– USB End Of Reset
capacitor should be 1µF (
Clock stopped
Dev ice
FRZCLK=1
+/-
Macro off
USBE=1
10%) for correct operation.
HW RESET from EOR
USBE=0
Reset
USBE=0
(excepted from EOR)
HW RESET
USBE=0
<any other
state>
AT90USB82/162
+/-
5%).
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