SAM9261 Atmel Corporation, SAM9261 Datasheet - Page 707

• Manufacturer Part Number: SAM9261
• Manufacturer: Atmel Corporation

Specifications of SAM9261

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 240 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 96
• Ext Interrupts: 96
• Usb Transceiver: 3
• Usb Speed: Full Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 1
• Uart: 4
• Ssc: 3
• Sd / Emmc: 1
• Graphic Lcd: Yes
• Video Decoder: No
• Camera Interface: No
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 160
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 1.08 to 1.32
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

42.3
42.3.1
42.3.1.1
42.3.2
42.3.2.1
6062N–ATARM–3-Oct-11
AT91SAM9261 Errata - Revision B Parts
Main Oscillator
Battery Backup
Main Oscillator: Spurious Malfunction of Main Oscillator
Backup Overconsumption during AHB Masters activity
Refer to
The main oscillator can exhibit spurious malfunction as exhibited by the duty-cycle not perform-
ing according to specification, missing main clock periods, or in the worst case, no main clock at
all. The behavior does not alter over time. A device fully tested over the operating range (includ-
ing power supply and temperature) in an application without exhibiting any malfunction will
continue to function according to specifications.
Placing a series resistor of 470 Ω between XOUT and the crystal will fix the issue.
The additional series resistor will not alter the device specification as documented in the
datasheet, including the startup time and power consumption.
Conditions:
During AHB Masters activity (LCD DMA, USB Host DMA, etc.) the backup current can rise up to
12 µA @ 25° C.
Figure 42-1 on page 694
when the main power supply is off. In active mode, the clocks of unused peripherals should be
disabled through the Power Management Controller to save power.
Figure 42-2. Schematic
Problem Fix/Workaround
Problem Fix/Workaround
Section 42.1 “Marking” on page
J1
CR1225
Z1
+
3V
shows how to feed the backup part of the chip from the battery only
MMBD1704A
R1
CR1
1K
693.
3V3
3
C1
100NF
MN1
R1100D121C
AT91SAM9261
C2
100NF
VDDBU
707