APPLICATION NOTES

MSK 4366 PIN DESCRIPTIONS

3

HALL A - is the Hall A sensor input from the motor to allow com-

mutation of the output phases. This input has a 5KΩ pull-up resis-

tor to +VDD for typical open-collector Hall sensor outputs. It is

also filtered with a 0.001uF capacitor to ground.

HALL B - is the Hall B sensor input from the motor to allow com-

mutation of the output phases. This input has a 5KΩ pull-up resis-

tor to +VDD for typical open collector Hall sensor outputs. It is

also filtered with a 0.001uF capacitor to ground.

HALL C - is the Hall C sensor input from the motor to allow

commutation of the output phases. This input has a 5KΩ pull-up

resistor to +VDD for typical open-collector Hall sensor outputs. It

is also filtered with a 0.001uF capacitor to ground.

+5V - is the main low level digital power for running everything

inside the hybrid, exclusive of the motor supply voltage. This supply

powers the microprocessor and all its support circuitry, as well as

provides the boost converter power for running the gate drive.

GND - is the ground return for the low level digital power. All

microprocessor / support circuitry and gate driver currents return

to this point. For PC board layouts, there should be two ground

planes.One ground plane is for the bypass capacitors and

components that assist in making a clean low level voltage supply.

Digital control inputs should have their returns connected to this

ground. The second ground plane is the main high power ground

used to drive the motor. That ground plane will contain all the large

bypass capacitors for the output stage and the high power main

motor supply. Both ground planes should be connected together at

one point; that connection point should be at this pin. This connection

width should be in the range of 0.1" to 0.15", with a separation

between grounds not to exceed 0.25". If the grounds are on separate

PC layers, then the grounds can overlap without a problem.

However, a large current conducting via connecting the two layers

together should be placed as close to this GND pin as practical.

A PHASE - is one of three phase power output pins to the motor.

Traces from this pin should be sized for 10 amps current.

B PHASE - is one of three phase power output pins to the motor.

Traces from this pin should be sized for 10 amps current.

C PHASE - is one of three phase power output pins to the motor.

Traces from this pin should be sized for 10 amps current.

+AV - is the A phase leg motor supply voltage pin. All V+ pins

shall be connected together on the PC board. Traces should be

sized for 10 amps current to this pin. Motor supply voltage shall be

bypassed with a high quality 100uF electrolytic capacitor, a 1uF

high quality ceramic capacitor and a high quality 6.8uF metalized

polyester capacitor. These capacitors shall be placed as close to

the V+pins and RTN pins as practical to minimize stray induc-

tance between the pins and the capacitors. All V+ pins shall be

connected together on the PC board. Ideally, some sort of power

plane should be used to help reduce stray inductance throughout all

the V+ connections to the capacitors.

+BV - is the B phase leg motor supply voltage pin. All V+ pins

shall be connected together on the PC board. Traces should be

sized for 10 amps current to this pin. Motor supply voltage shall be

bypassed with a high quality 100uF electrolytic capacitor, a 1uF

high quality ceramic capacitor and a high quality 6.8uF metalized

polyester capacitor. These capacitors shall be placed as close to

the V+pins and RTN pin as practical to minimize stray inductance

between the pins and the capacitors. All V+ pins shall be connected

together on the PC board. Ideally, some sort of power plane should

be used to help reduce stray inductance throughout all the V+

connections to the capacitors.

+CV - is the C phase leg motor supply voltage pin. All V+ pins

shall be connected together on the PC board. Traces should be

sized for 10 amps current to this pin. Motor supply voltage shall be

bypassed with a high quality 100uF electrolytic capacitor, a 1uF

high quality ceramic capacitor and a high quality 6.8uF metalized

polyester capacitor. These capacitors shall be placed as close to

the V+pins and RTN pin as practical to minimize stray inductance

between the pins and the capacitors. All V+ pins shall be connected

together on the PC board. Ideally, some sort of power plane should

be used to help reduce stray inductance throughout all the V+

connections to the capacitors.

A RTN - is the power ground return for the A phase high current

path for the motor output. This pin should be connected directly to

the RSENSE pin to allow for proper current sensing.

B RTN - is the power ground return for the B phase high current

path for the motor output. This pin should be connected directly to

the RSENSE pin to allow for proper current sensing.

C RTN - is the power ground return for the C phase high current

path for the motor output. This pin should be connected directly to

the RSENSE pin to allow for proper current sensing.

RESET - is an asserted low, digital logic input for manually resetting

the microprocessor. Activating the pin will halt PWM output and

reset program control. The microprocessor will begin operation in

exactly the same manner as a cold start from power up. This

function is intended to be used as an aid to system development. It

is pulled up to +5V by a 10KΩ resistor internally.

CAN H - is one of two pins for communicating on the CAN bus.

This pin shall be connected to the associated CAN H node on the

host bus.

CAN L - is the second of two pins for communicating on the CAN

bus. This pin shall be connected to the associated CAN L node on

the host bus.

CAN RESET - is an asserted low, digital logic input for manually

resetting the CAN module. Activating this pin will cause the module

to be de-activated, reset to 1M bit/sec speed and re-activated

upon release. This pin shall be externally up to +5V via a 10KΩ

resistor.

RSENSE - is the pin used for current sensing. The A RTN, B RTN,

C RTN pins should all be connected directly to this pin in order to

allow proper current sensing. This pin is connected to one side of

the current sense resistor while the RTN pin is connected to the

other site.

RTN - is the power ground return. All low power ground returns

should be through the GND pin. Traces should be sized for 10

amps current to this pin. The motor supply bypass capacitors shall

be connected to this point as close as practical to minimize stray

inductance between these pins and the capacitors. A power ground

plane shall be used between this pin and the capacitors to help

reduce stray inductance. This power ground plane shall be connected

to the low power GND plane only at one point – the GND pin.

Follow the guidelines explained with GND for details on this

connection.

8548-120 Rev. A 4/14