L9959 datasheet(10/49 Pages) STMICROELECTRONICS

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Pins description

L9959

10/49

DocID027540 Rev 3

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.

/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.

GNDABE1

Sense Ground for VDD monitoring

10, 28

AGND

Device Ground. (Connected to Exposed PAD)

11, 29

To be connected to GND on PCB.

VDD2(2)

VDD Supply: 5V Supply.

13, 14,

VS2(3)

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.

DIS2

Disable input 2:

DIS2 switches OUT21 and OUT22 to tristate.

DIR2

Direction input 2:

DIR2 pin controls the switch direction of OUT21 and OUT22.

PWM2

PWM input 2:

PWM1 input switches OUT21 and OUT22.

OUT22

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.

PGND2(1)

Ground:

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

externally connected.

OUT21

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.

SCK2

Serial clock input:

This input controls the internal shift register of the SPI.

SCK1 belongs to chip 1 and SCK2 to chip 2.

SS2

Slave Select input:

The serial data transfer between the device and the micro controller is enabled by pulling

the input SS to low level.

SS1 belongs to chip 1 and SS2 to chip 2.

SI2

Slave in (Serial data input):

The input receives serial data from the microcontroller.

SI1 belongs to chip 1 and SI2 to chip 2.

SO2

Slave Out (Serial data output):

The diagnosis data is available via the SPI through this tristate-output.

SO1 belongs to chip 1 and SO2 to chip 2.

Table 3. L9959T (Two H-Bridge drivers in one package) PSSO36 pin-out (continued)

Symbol

Function

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