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If a device such as a battery is
connected across two channels
for a differential measurement,
AIN0
R10
LN0
ADC
and it is not referenced to
analog ground, then the current
from the device will flow
through both sets of attenuator
Device +
-
AIN1
I
1 nF
1 nF
R11
R0
+
R1
?
LN1
This will generate a negative
voltage at one of the inputs,
LN1, which will almost cer-
tainly lead to inaccurate A/D
Figure 9. Current Flow from Ungrounded
or Floating Source
conversions. To make such dif-
ferential measurements, connect R0 and R1 to the A/D converter ’s internal reference volt-
age, which is software-configurable for 1.15 V, 2.048 V, or 2.5 V. This internal reference
voltage is available on pin 9 of header J1 as VREF, and allows you to convert analog input
voltages that are negative with respect to analog ground.
NOTE: The amplifier inside the A/D converter ’s internal voltage reference circuit has a
very limited output-current capability. The internal buffer can source up to 20 mA and
sink only up to 20 μA. Use a separate buffer amplifier if you need to supply any load
current.
The A/D converter ’s CONVERT pin is available on pin 10 of header J1 and can be used as
a hardware means of forcing the A/D converter to start a conversion cycle. The CONVERT
signal is an edge-triggered event and has a hold time of two CCLK periods for debounce.
A conversion is started by an active (rising) edge on the CONVERT pin. The CONVERT
pin must stay low for at least two CCLK periods before going high for at least two CCLK
periods. Figure 10 shows the timing of a conversion start. The double falling arrow on
CCLK indicates the actual start of the conversion cycle.
Conversion starts
CCLK
BUSY
CONV
Figure 10. Timing Diagram for Conversion Start Using CONVERT Pin
Board.
32
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