User's Manual l MBa8x UM 0100 l © 2021, TQ-Systems GmbH
Page 37
TQMa8x
ADC_IN0
mikroBUS
ADC_IN1
ADC_IN2
Jumper
V_IN (24 V)
Pin header
filter/protection
V_12V
filter/protection
filter/protection
Figure 25:
Block diagram ADC
The input voltage and the 12 V level can be connected to ADC_IN1 by using jumpers. Furthermore, the input signal is connected
to pin 15 of header X64 and can be supplied with up to 30 V from there.
ADC_IN2, on the other hand, is connected directly to pin 17 of header X64 and can be supplied with up to 5 V.
The scaling factors and cut-off frequencies are shown in the table below.
Table 25: Values ADC circuit
Channel
Identifier
Vin
R1
R2
Scaling factor
Cut-off frequency with 100 nF
ADC_IN0
mikroBUS
5 V
4,32 kΩ
2,4 kΩ
0,3571
368,4 Hz
ADC_IN1
V_IN / V_12V
30 V 21,5 kΩ
1,37 kΩ
0,06
74,0 Hz
ADC_IN2
Pin header
5 V
4,32 kΩ
2,4 kΩ
0,3571
368,4 Hz
3.14.20
MBa8x headers
The MBa8x provides four 100 mil headers. All signals, which are not used on the MBa8x, mainly low-speed signals such as GPIO,
SPI and UART, are made available on these headers.
Besides the signals, 1.8 V, 3.3 V, 5 V and 12 V are available on each header. The maximum current load of the individual voltages
on the headers depends on the load on other connectors. In total, no more than the specified maximum current may be drawn
at the following interfaces:
Table 26:
Current consumption headers
Rail
I
max
Remark
V_12V
2.5 A
Sum of currents at X4, X7, X60, X61, X62, X63, X64
V_5V
1.5 A
Sum of currents at X4, X7, X8, X11, X21, X24, D29, X57, X60, X61, X62, X63, X64
V_3V3_MB
0.6 A
Sum of currents at X8, X11, X21, D29, X47, X61, X62, X63, X64
V_1V8
0.7 A
Sum of currents at X60, X61, X62, X63, X64
Table 27:
Pinout Header X61
I/O
Level
Group
Signal
Pin
Signal
Group
Level
I/O
P
12 V
Power
V_12V
1
2
V_3V3_MB
Power
3.3 V
P
P
5 V
Power
V_5V
3
4
V_1V8
Power
1.8 V
P
P
0 V
Power
GND
5
6
GND
Power
0 V
P
I
1.8 V
SNVS
TAMPER_IN0
7
8
SCU_UART_RX
SCU
1.8 V
I
I
1.8 V
SNVS
TAMPER_IN1
9
10
SCU_UART_TX
SCU
1.8 V
O
O
1.8 V
SNVS
TAMPER_OUT0
11
12
SCU_GPIO0_07
SCU
1.8 V
I/O
O
1.8 V
SNVS
TAMPER_OUT1
13
14
GND
Power
0 V
P
I/O
VAR
GPIO
GPIO5_IO24
15
16
I2C1_SCL
I2C1
1.8 V
O
I/O
VAR
GPIO
GPIO5_IO25
17
18
I2C1_SDA
I2C1
1.8 V
I/O
I/O
VAR
GPIO
GPIO5_IO26
19
20
I2C1_3V3_SDA
I2C1
3.3V
I/O
I/O
VAR
GPIO
GPIO5_IO27
21
22
I2C1_3V3_SCL
I2C1
3.3V
O