Microcontroller With Logic - Motorola M68HC08 Manual

Hardware Design
HallSensor_C
1
+5V
2
HallSensor_A
3
HallSensor_B
4
V_DCBUS
5
Speed Pot
6
7
8
Run/Stop Switch
5.2.2 Hall Sensor Interface
Designer Reference Manual
38
Freescale Semiconductor, Inc.
resistor R28 ensures the save state on the NAND logic during power-on,
when MCU pins are configured as high impedance inputs. This feature
ensures that all power transistors remain off during power-up and
power-down.
PB0
PB1
PB2
PB3
PB4
PB5
U1
Vdd
PTB7
PTB6
PTA5/OSC1/AD3/KBI5 PTA0/AD0/TCH0/KBI0
PTA4/OSC2/AD2/KBI4 PTA1/AD1/TCH1/KBI1
PTB5
PTB4
PTA3/*RST/KBI3 PTA2/IRQ/KBI2
MC68HC908QY4SOIC
Figure 5-3. Microcontroller with Logic
The Hall sensor interface circuitry provides filtered Hall sensor signal for
the microcontroller. The pull-ups on all 3 phase signals are implemented.
The configuration resistors R41 and R42 enable selecting the
appropriate voltage of +12V
using zero-ohms resistors. WARNING: Never populate both resistors
Hardware Design
For More Information On This Product,
Go to: www.freescale.com
PWM_AT
PWM_AB
PWM_BT
PWM_BB
U5D
12
PWM_CT
PWM_CB 13
MC74HC03AD
U5C
9
10
GND
MC74HC03AD
16
U5B
Vss
15 4
PTB0
14
PTB1
13 5
12
11
MC74HC03AD
PTB2
10
U5A
PTB3
9 1
2
Fault
MC74HC03AD
U6B
4
R28 5
10k
MC74HC03AD
U6C
9
GND
10
MC74HC03AD
or +5V on pin 5 of the J1 connector,
DC DC
R36 R38 R40
+5V
10k 10k 10k
R35 R37 R39
10k 10k 10k
11
PWM_AT
8
PWM_AB
6
PWM_BT
3
PWM_BB
6
PWM_CT
8
PWM_CB
DRM046 — Rev 0
MOTOROLA