TPIC44L01, TPIC44L02, TPIC44L03

4CHANNEL SERIAL AND PARALLEL LOW SIDE PREFET DRIVER

4

POST OFFICE BOX 655303

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

CS

8

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 registers 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.

DRAIN0

21

I

FET drain inputs. DRAIN0 through DRAIN3 are used for both open-load and short-circuit fault detection at the

DRAIN1

19

g

drain of the external FETs. They are also used for inductive transient protection.

DRAIN2

16

DRAIN3

14

FLT

1

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 pullup resistor.

GATE0

20

O

Gate drive output. GATE0 through GATE3 outputs are derived from the VBAT supply voltage. Internal clamps

GATE1

18

g

BAT

yg

prevent voltages on these nodes from exceeding the VGS rating on most FETs.

GATE2

17

GATE3

15

GND

13

I

Ground and substrate

IN0

4

I

Parallel gate driver. IN0 through IN3 are real-time controls for the gate predrive circuitry. They are CMOS

IN1

5

gg

g

y

y

compatible with hysteresis.

IN2

6

IN3

7

RESET

22

I

Reset. A high-to-low transition of RESET clears all registers and flags. Gate outputs turn off and the FLT flag

is cleared.

SCLK

11

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.

SDI

10

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.

SDO

9

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.

VBAT

24

I

Battery supply voltage

VCC

12

I

Logic supply voltage

VCOMPEN

2

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.

VCOMP

3

I

Fault reference voltage. VCOMP provides an external fault reference voltage for the shorted-load and

open-load fault detection circuitry.