NXP Semiconductors MC56F80000-EVKUM, Руководство пользователя, Страница: 16 / 26

NXP Semiconductors
MC56F80000-EVKUM
MC56F80000-EVK Board User Manual
• Resistor divider circuit 1
–
Thermistor RT1 is between THER_A and THER_B
– Supports temperature from 90 °C to -20 °C
– THER_A is connected to the GPIOA6 (ANA6) pin of MC56F80748
– THER_B is connected to the GPIOA7 (ANA7) pin of MC56F80748
–
Voltage between THER_A and THER_B can vary from 0.372 V to 2.879 V depending
on the temperature
• Resistor divider circuit 2
– Is used to test the ANA4/ANB4 Expansion Mux of ADC control block of MC56F80748
– Is connected to the GPIOC5 (ANB4d) pin of MC56F80748
–
Is connected to the GPIOF7 (ANA4f) pin of MC56F80748
•
Resistor divider circuit 3
– Is used to test the ANA4/ANB4 Expansion Mux of ADC control block of MC56F80748
– Is connected to the GPIOC14 (ANB4c) pin of MC56F80748
– Is connected to the GPIOC15 (ANA4c) pin of MC56F80748
2.6 PWM interface
The filtered PWM circuit on the MC56F80000-EVK is provided to test the function of the
OPAMP, CMP, and ADC blocks of the processor.
OPAMP test with filtered PWM output
J 19
HDR 1X2
J UMP ER DEFAULT = 1-2
1 2
C76
0.1 µF
J 15
HDR_1X3
J UMP ER DEFAULT = 2-3
1
2
3
TP 17
R108
2.0K
R110
10K
R109
1.0K
TP 18
TP 16
J 16
HDR 1X2
J UMP ER DEFAULT = 1-2
1 2
GB6
GE6 GB7
GC4
GA1
OPA_IN0
GE6 / PWMA_3B
ANVP
CMPB_IN1
OPA_OUT
Figure 10. OPAMP, CMP, and ADC blocks test schematic diagram
The GPIOE6 (PWMA_3B) output is connected with GPIOB7 and GPIOB6 through RC
filter circuit. The filtered PWM signal can be connected with GPIOA1 (OPAMPA_IN0)
directly or through resistor R108 depending on jumper J15. The resistor R109, which
is in between GPIOA1 (OPAMPA_IN0) and GPIOC4 (OPAMPA_OUT), can be used as
OPAMP feedback resistor, if GPIOA1 is configured as OPAMP inverting input.
The following configurations can be used to test the function of the ADC, CMP, and
OPAMP on this circuit.
• CMP/ADC test configuration
– The GPIOE6 (PWMA_3B) can be configured to output a PWM signal. The cut-off
frequency of the low-pass RC filter is 160 Hz. When the frequency of the PWM
signal is much higher than the cut-off frequency, the output signal of the RC filter
MC56F80000-EVKUM All information provided in this document is subject to legal disclaimers. © 2022 NXP B.V. All rights reserved.
User manual Rev. 1 — 14 December 2022
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