L6229Q datasheet(7/28 Pages) STMICROELECTRONICS

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L6229Q

Pin connection

Doc ID 15209 Rev 3

7/28

Table 5.

Pin description

N°

Type

Function

1, 21

GND

Ground terminals.

9TACHO

Open drain

output

Frequency-to-voltage open drain output. Every pulse from pin H1 is shaped

as a fixed and adjustable length pulse.

RCPULSE

RC pin

RC network pin. A parallel RC network connected between this pin and

ground sets the duration of the monostable pulse used for the frequency-to-

voltage converter.

SENSEB

Power supply

Half bridge 3 source Pin. This pin must be connected together with pin

SENSEA to power ground through a sensing power resistor. At this pin also

the Inverting Input of the sense comparator is connected.

FWD/REV

Logic input

Selects the direction of the rotation. HIGH logic level sets forward operation,

whereas LOW logic level sets reverse operation.

If not used, it has to be connected to GND or +5 V.

Logic input

Chip enable. LOW logic level switches OFF all power MOSFETs.

If not used, it has to be connected to +5 V.

VREF

Logic input

Current controller reference voltage.

Do not leave this pin open or connect to GND.

BRAKE

Logic input

Brake input pin. LOW logic level switches ON all high side power MOSFETs,

implementing the brake function.

If not used, it has to be connected to +5 V.

VBOOT

Supply

voltage

Bootstrap voltage needed for driving the upper power MOSFETs.

OUT3

Power output Output half bridge 3.

VSB

Power supply

Half bridge 3 power supply voltage. It must be connected to the supply

voltage together with pin VSA.

VSA

Power supply

Half bridge 1 and half bridge 2 power supply voltage. It must be connected to

the supply voltage together with pin VSB.

OUT2

Power output Output half bridge 2.

VCP

Output

Charge pump oscillator output.

Sensor input Single ended hall effect sensor input 2.

Sensor input Single ended hall effect sensor input 3.

Sensor input Single ended hall effect sensor input 1.

DIAG

Open drain

output

Overcurrent detection and thermal protection pin. An internal open drain

transistor pulls to GND when an overcurrent on one of the high side

MOSFETs is detected or during thermal protection.

SENSEA

Power supply

Half bridge 1 and half bridge 2 source pin. This pin must be connected

together with pin SENSEB to power ground through a sensing power resistor.

RCOFF

RC pin

RC network pin. A parallel RC network connected between this pin and

ground sets the current controller OFF-Time.

OUT1

Power output Output half bridge 1.

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