XE8806A SEMTECH [Semtech Corporation], XE8806A Datasheet - Page 14

• Manufacturer Part Number: XE8806A
• Description: Ultra Low-Power Low-Voltage
• Manufacturer: SEMTECH [Semtech Corporation]

Hints for low power operation:
1. Use the low power RAM instead of the RAM for all parameters that are accessed frequently. The average
2. Rather than using the circuit at low speed, it is better to use the circuit at higher speed and switch off the blocks
3. The power consumption of the program memory is an important part of the overall power consumption. In case
2.4 Operating speed
2.4.1
The speed of the flash devices is not highly dependent upon the supply voltage. However, by limiting the
temperature range, the speed can be increased. The minimal guaranteed speed as a function of the supply voltage
and maximal temperature operating temperature is given in Figure 2-2.
Note that the speed of the flash circuit version is limited by the flash memory. All other peripherals of the device
can run at the same speed as the ROM version (see Figure 2-6). The maximal speed of the peripherals can be
exploited by reducing the CPU frequency by a factor of 2 with respect to the clock source by executing the
instruction “FREQ div2”. Take care to execute this instruction before increasing the clock speed above the figures
given in Figure 2-2.
© Semtech 2006
current consumption for the low power RAM is about 40 times lower than for the RAM.
when not needed.
you intend to use a ROM version and power consumption is too high, please ask us to provide you with a
circuit version with smaller ROM size.
Flash circuit version XE8806AM
Figure 2-2. Guaranteed speed as a function of the supply voltage and maximal temperature.
3.5
2.5
1.5
0.5
Figure 2-1. Supply configuration for flash circuit operation.
3
2
1
0
2
2.5
VBAT
VREG
VSS
3
supply voltage VBAT (V)
3.5
2-4
1uF
4
85°C
4.5
2.4 - 5.5 V
45°C
5
XE8806A/XE8807A
5.5
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