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TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-111
V1.1, 2011-05
ADC, V1.3
23.2.17
Multiplexer Test Support
A specific multiplexer test mode has been implemented for the analog input CH7 that can
be enabled during run time by the user to check the connection to the sensor.
•
Multiplexer test mode disabled
(
.MTM7 = 0):
The switch for the voltage divider and static load R
MTM7
is open. The analog input
CH7 can be used for normal measurements.
•
Multiplexer test mode enabled
(
.MTM7 = 1):
The switch for the voltage divider and static load R
MTM7
is closed. The analog input
CH7 is loaded by a resulting resistance and the measured voltage is reduced by a
voltage divider.
Please refer to the AC/DC chapter for the value of the resulting grounding resistor
and its current capability.
Figure 23-22 Multiplexer Test Mode for CH7
In addition to the multiplexer test support for channel CH7 based on bit MTM7, one out
of input channels listed below can also be enabled for the same function. The additional
channel number is selected by bit field GLOBCFG.MTMCH and the test mode becomes
enabled for this channel if GLOBCFG.MTMEN = 1.
The following channels can be selected for the additional multiplexer test mode support:
CH1, CH3, CH5, CH7, CH9, CH11, CH13, CH15
The channels with an even channel number do not support this test mode, even if their
channel number is selected and MTMEN = 1.
The multiplexer test mode for input channel CH7 can be activated by both mechanisms.
ADC_MTM7
ADC kernel
C
AIN
R
AIN
V
AGND
CH7
C
EXT
V
AINx
R
EXT
V
S
R
MTM7
Содержание TC1784
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