AT89C5131A-L Atmel Corporation, AT89C5131A-L Datasheet - Page 12

• Manufacturer Part Number: AT89C5131A-L
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-L

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 3.6
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

PCB Recommandations
12
AT89C5131A-L
Figure 5. USB Pads
Figure 6. USB PLL
VRef
D+
D-
Components must be
close to the
microcontroller
close to the
microcontroller
Components must be
If possible, isolate D+ and D- signals from other signals
with ground wires
Isolate filter components
with a ground wire
AVss
Wires must be routed in Parallel and
must be as short as possible
PLLF
USB Connector
4338F–USB–08/07