Datasheet

SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
712
42.2 SAM9261 Errata - Revision B Parts
Refer to Section 40. “Marking” on page 698.
42.2.1 Main Oscillator
42.2.1.1 Main Oscillator: Spurious Malfunction of Main Oscillator
The main oscillator can exhibit spurious malfunction as exhibited by the duty-cycle not performing 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 (including power supply and temperature) in an
application without exhibiting any malfunction will continue to function according to specifications.
Problem Fix/Workaround
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.
42.2.2 Battery Backup
42.2.2.1 Backup Overconsumption during AHB Masters activity
Conditions:
During AHB Masters activity (LCD DMA, USB Host DMA, etc.) the backup current can rise up to 12 µA @ 25°C.
Problem Fix/Workaround
Figure 42-2 shows how to feed the backup part of the chip from the battery only 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
42.2.3 Boot ROM
42.2.3.1 Boot ROM: Temperature Range
The temperature range for the Boot ROM use is 0°C / 70°C.
Starting up the device outside this temperature range can lead to unpredictable behavior. If the SAM9261-based
system may have to start up at temperatures below 0°C and above 70°C, it is recommended to boot out of an
external memory connected on NCS0.
Problem Fix/Workaround
3V3
+
CR1225
3V
Z1
CR1
MMBD1704A
1
3
2
MN1
R1100D121C
OUT
1
VDD
2
GND
3
R1 1K
C1
100NF
J1
C2
100NF
VDDBU