STLC5444 datasheet(4/17 Pages) STMICROELECTRONICS

4 / 17 page

FUNCTIONAL DESCRIPTION (continued)

DGND - Ground Digital

ILIM - Current Limit Programming (Input)

ILIM programs the current limit of the Output driv-

ers using an external resistor connected between

ILIM and VBB. The ILIM pin is 1.25V more posi-

tive than VBB. The current limit is 5mA plus 1000

times the current in the external resistor. The pro-

grammed current limit applies to each driver.

INT - Interrupt (Output; Open-Collector, Active

Low)

INT augments the Microprocessor Interface by

generating an interrupt when a Current Overload

Detector (COD) occurs. INT is active whenever

any bits in the COD register are active. INT is not

latched; when the COD register is zero, INT goes

inactive (High). INT will also go inactive if the

IQFPS automatically disables the S-output driver

that caused the interrupt (due to Thermal Over-

load), or if the microprocessor disables that line

via the Line Enable Register (LER). COD inter-

rupts can be masked via the Indirect Address

pin.

RD - Read (Input; Active Low)

The active Low read signal is conditioned by CS

and transfers internal information to the data bus.

If A0 is a logical 0, logic levels of the Indirect Ad-

dress Register (IAR) and Thermal Shutdown

Status bit will be transferred to D3-D0. If A0 is a

logical 1, the data addressed by the IAR will be

transferred to D3-D0.

RESET - Reset (Input; Active High)

RESET initialize the registers in the device, leav-

ing the drivers switched off.

S3-S0 - Drivers (Output)

S3-S0 each supply power to one line. The outputs

can sink up to 120 mA each. The voltage at the

line is connected to VBB through a DMOS switch.

VBB - Battery Voltage (input)

VBB is the internal negative supply voltage. VBB

must always be connected to the most negative

supply voltage. The MPI Registers will not func-

tion properly when the battery power is discon-

nected, that is, when VBB is floating or grounded.

The IQFPS should also be reset if a drastic tran-

sient is applied to VBB.

VCC - +5V Power Supply (Input)

WR - Write (Input; Active Low)

The active Low write signal is conditioned by CS

and transfers information from the data bus to an

internal register selected by A0. If A0 is a logical

1, D3-D0 is written into the Line Enable Register

(LER). If A0 is a logical 0, D3-D0 is written into

the IAR. LER and IAR are the only two writable

registers in the device.

STLC5444

4/17

STLC5444 Datasheet(PDF) 4 Page - STMicroelectronics

STLC5444 Datasheet(HTML) 4 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Datasheet Download

Link URL