ata6616 ATMEL Corporation, ata6616 Datasheet - Page 69

• Manufacturer Part Number: ata6616
• Description: Microcontroller With Lin Transceiver, 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

4.6.8
4.6.8.1
4.6.8.2
4.6.8.3
4.6.8.4
4.6.8.5
9132A–AUTO–10/08
DRAFT
Minimizing Power Consumption
Analog to Digital Converter
Analog Comparator
Brown-out Detector
Internal Voltage Reference
Internal Current Source
There are several possibilities to consider when trying to minimize the power consumption in an
AVR controlled system. In general, sleep modes should be used as much as possible, and the
sleep mode should be selected so that as few as possible of the device’s functions are operat-
ing. All functions not needed should be disabled. In particular, the following modules may need
special consideration when trying to achieve the lowest possible power consumption.
If enabled, the ADC will be enabled in all sleep modes. To save power, the ADC should be dis-
abled before entering any sleep mode. When the ADC is turned off and on again, the next
conversion will be an extended conversion. Refer to
verter” on page 215
When entering Idle mode, the Analog Comparator should be disabled if not used. When entering
ADC Noise Reduction mode, the Analog Comparator should be disabled. In other sleep modes,
the Analog Comparator is automatically disabled. However, if the Analog Comparator is set up
to use the Internal Voltage Reference as input, the Analog Comparator should be disabled in all
sleep modes. Otherwise, the Internal Voltage Reference will be enabled, independent of sleep
mode. Refer to
configure the Analog Comparator.
If the Brown-out Detector is not needed by the application, this module should be turned off. If
the Brown-out Detector is enabled by the BODLEVEL Fuses, it will be enabled in all sleep
modes, and hence, always consume power. In the deeper sleep modes, this will contribute sig-
nificantly to the total current consumption. Refer to
page 75
The Internal Voltage Reference will be enabled when needed by the Brown-out Detection, the
Analog Comparator or the ADC. If these modules are disabled as described in the sections
above, the internal voltage reference will be disabled and it will not be consuming power. When
turned on again, the user must allow the reference to start up before the output is used. If the
reference is kept on in sleep mode, the output can be used immediately. Refer to
“Internal Voltage Reference” on page 77
Output the internal voltage reference is not needed in the deeper sleep modes. This module
should be turned off to reduce significantly to the total current consumption. Refer to
4.17.3.1 “AMISCR – Analog Miscellaneous Control Register” on page 214
disable the internal voltage reference output.
The Internal Current Source is not needed in the deeper sleep modes. This module should be
turned off to reduce significantly to the total current consumption. Refer to
“AMISCR – Analog Miscellaneous Control Register” on page 214
the Internal Current Source.
for details on how to configure the Brown-out Detector.
Section 4.19 “AnaComp - Analog Comparator” on page 236
for details on ADC operation.
ATA6616/ATA6617 [Preliminary]
for details on the start-up time.
Section 4.18 “ADC – Analog to Digital Con-
Section 4.7.1.5 “Brown-out Detection” on
for details on how to disable
for details on how to
for details on how to
Section 4.17.3.1
Section 4.7.2
Section
69