ata6616 ATMEL Corporation, ata6616 Datasheet - Page 214

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ata6616

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

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4.17.2.2
4.17.2.3
4.17.2.4
4.17.3
4.17.3.1
214
ATA6616/ATA6617 [Preliminary]
Control Register
Current Source for Low Cost Transducer
Voltage Reference for External Devices
Threshold Reference for Internal Analog Comparator
AMISCR – Analog Miscellaneous Control Register
An external transducer based on a variable resistor can be connected to the Current Source.
This can be, for instance:
Using the Current Source with this type of transducer eliminates the need for additional parts
otherwise required in resistor network or Wheatstone bridge.
An external resistor used in conjunction with the Current Source can be used as voltage refer-
ence for external devices. Using a resistor in series with a lower tolerance than the Current
Source accuracy ( 2%) is recommended.
using standard values of resistors.
An external resistor used in conjunction with the Current Source can be used as threshold refer-
ence for internal Analog Comparator (see
page
(positive Analog Compare input pin). Using a resistor in series with a lower tolerance than the
Current Source accuracy ( 2%) is recommended.
erences using standard values of resistors.
• Bit 0 – ISRCEN: Current Source Enable
Writing this bit to one enables the Current Source as shown in
use DIDR register bit function when ISRCEN is set and to turn off the Current Source once the
ADC measurement is done.
Bit
Read/Write
Initial Value
• A thermistor, or temperature-sensitive resistor, used as a temperature sensor,
• A CdS photoconductive cell, or luminosity-sensitive resistor, used as a luminosity sensor,
• ...
236). This can be connected to AIN0 (negative Analog Compare input pin) as well as AIN1
R
7
0
-
R
6
0
-
R
5
0
-
Table 4-53
Section 4.19 “AnaComp - Analog Comparator” on
R
4
0
-
DRAFT
Table 4-53
R
3
0
-
gives an example of voltage references
AREFEN XREFEN
R/W
gives an example of threshold ref-
Figure
2
0
4-81. It is recommended to
R/W
1
0
ISRCEN AMISCR
R/W
0
0
9132A–AUTO–10/08

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