L9959S datasheet(9/43 Pages) STMICROELECTRONICS

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L9959S, L9959T

Pins description

Table 3. L9959T (Two H-Bridge drivers in one package) pinout

Symbol

Function

13, 14,

VS2(1)

Power supply voltage for power stage outputs (external reverse protection required):

Important: For the capability of driving the full current at the outputs all pins of VS must be

externally connected.

31, 32

VS1(1)

1PGND1(2)

Ground:

Important: For the capability of driving the full current at the outputs, all ground pins must be

externally connected.

PGND2(2)

11, 29

CAP3V3

Pin for external capacitor:

This capacitor is used for the internal 3.3 V controller. A capacitance between 60 nF and

150 nF (typical 100 nF) is required and has to be connected close to this pin with low

inductance and resistance.

VDD1(3)

VDD Supply: 5V Supply.

VDD2(3)

GNDABE1

Sense Ground for VDD monitoring

GNDABE2

10, 28

AGND

Device Ground

2OUT11

Bridge output 11, 12, 21, and 22:

The bridge outputs are built of a high-side p-channel and a low-side n-channel transistor.

The bridge outputs of chip 1 are OUT11 and OUT12, of chip 2 OUT21 and OUT22.

OUT12

OUT21

OUT22

DIR1

Direction input 1:

DIR1 pin controls the switch direction of OUT11 and OUT12.

PWM1

PWM input 1:

PWM1 input switches OUT11 and OUT12.

DIS1

Disable input 1:

DIS1 switches OUT11 and OUT12 to tristate

/ABE1

Bidirectional Ability/Enable Pin 1:

Open-Drain Output, which is pulled low in case of VDD over- and under-voltage. If the input

is pulled to low, all output stages are switched off. /ABE1 belongs to chip 1.

DIR2

Direction input 2:

DIR2 pin controls the switch direction of OUT21 and OUT22.

PWM2

PWM input 2:

PWM1 input switches OUT21 and OUT22.

DIS2

Disable input 2:

DIS2 switches OUT21 and OUT22 to tristate.

/ABE2

Bidirectional Ability/Enable Pin 2:

Open-Drain Output, which is pulled low in case of VDD over- and under-voltage. If the input

is pulled to low, all output stages are switched off. /ABE2 belongs to chip 2.

CF1

Current Proportional Feedback output:

The CF pin provides in conjunction with an external resistor an output current, which is

proportional to the H-Bridge current. CF1 belongs to OUT11 and OUT12, CF2 to OUT21

and OUT22.

CF2

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