USER GUIDE
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EM8500 SERIES
Copyright
2016, EM Microelectronic-Marin SA
EMDVK8500-MN01, Version 2.0, 5-Jul-16
21
420005-A01, 3.0
7.4
INTERNAL MEASUREMENT: A/D ACQUISITION UNIT
One ADC single-ended channel is used for application board node voltage measurements. The node is shown in
Figure 7-1: Application board description a
s “APP_ADC_CHANNEL” or Figure 7-2: Application board schematic as
“VAPP_CHANNEL_0” or summarized below in Figure 7-3: Configuration for ADC application input.
The source of this ADC channel is selected through jumper JP2 as shown on the Figure 7-1: Application board
description.
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By connecting JP2 in position “PB0” the EM6819 pad PB0 (GPIO Port B bit 0) is connected to the A/D
channel APP_ADC_CHANNEL (“VAPP_CHANNEL_0”). See Figure 7-3: Configuration for ADC
application input configuration A.
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By connecting JP2 in position “D1” the voltage across the resistor R9 serially connected to the LED D1, is
connected to the A/D channel APP_ADC_CHANNEL (“VAPP_CHANNEL_0”). Additionally, to monitor the
LED D1 current, the jumper JP1 must be placed to power D1 from the VAUX1 output of the EM8500. See
Figure 7-3: Configuration for ADC application input configuration B.
SERIAL RESISTOR
TEST POINT
DOMAIN
NAME
VALUE
DESCRIPTION
JP1/JP3
Led D1
R9
100 ohm
Led serial resistor
Table 7-2 D1 monitoring
I(t)
D1 =
V(t)
R9
/ R9
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By connecting JP2 to position “USER” the user input is connected to A/D channel APP_ADC_CHANNEL
(“VAPP_CHANNEL_0”). The user signal can be applied on the connector APP_TP (pin 9). See Figure
7-3: Configuration for ADC application input configuration C.
PB0 (PB0_TP)
JP2
D1
JP2
USER
JP2
JP1
<
- U
S
E
R
IN
PU
T
1
APP_TP
9
A. CONFIG VOLTAGE PB0
B. CONFIG CURRENT D1
C. CONFIG USER INPUT
Figure 7-3: Configuration for ADC application input
