STPIC44L02

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PIN DESCRIPTION

PIN No

SYMBOL

I/O

NAME AND FUNCTION

1FLT

I

Fault Flag. FLT is a logic level open-drain output that provides a real time fault flag for

shorted-load, open-load, over-battery voltage, under-battery voltage faults. The

device can be ORed with FLT terminals on other devices for interrupt handling. FLT

requires an external pull-up resistor.

2

VCOMPEN

I

Fault reference voltage select. VCOMPEN selects the internally generated fault

reference voltage (0) or an external fault reference (1) to be used in the shorted and

open load fault detection circuitry.

3

VCOMP

I

Fault reference voltage. VCOMP provides an external fault reference voltage for the

shorted-load and open load fault detection circuitry.

4

5

6

7

IN0

IN1

IN2

IN3

I

Parallel gate driver. IN0 trough In3 are real-time controls for the gate pre drive

circuitry. They are CMOS compatible with hysteresis.

8CS

I

Chip select. A high to low transition on CS enables SDO, latches fault data into the

serial interface, and refreshes FLT. When CS is high, the fault register can change

fault status. On the falling edge of CS, fault data is latched into the serial output

register and transferred using SDO and SCLK. On a low to high transition of CS,

serial data is latched in to the output control register.

9

SDO

O

Serial data output. SDO is a 3-state output that transfers fault data to the controlling

device. It also passes serial input data to the next stage for cascaded operation. SDO

is taken to a high-impedance state when CS is in a high state.

10

SDI

I

Serial data input. Output control data is clocked into the serial register through SDI. A

1 on SDI commands a particular gate output on and a 0 turns it off.

11

SCLK

I

Serial clock. SCLK clocks the shift register. Serial data is clocked into SDI and serial

fault data is clocked out of SDO on the falling edge of the serial clock.

12

I

Logic Supply Voltage

13

GND

I

Ground

14

16

19

21

DRAIN0

DRAIN1

DRAIN2

DRAIN3

I

FET drain inputs. DRAIN0 through DRAIN3 are used for both open load and short

circuit fault detection at the drain of the external FETs. They are also used for

inductive transient protection.

15

17

18

20

GATE0

GATE1

GATE2

GATE3

O

voltage. Internal clamps prevent voltages on these nodes from exceeding the VGS

rating of most FETs.

22

RESET

I

Reset. A high-to low transition of RESET clears all registers and flags. Gate outputs

turn off and the FLT flag is cleared.

23

NC

Not Connected

24

I

Battery Supply Voltage