HOLT INTEGRATED CIRCUITS

3

SYMBOL

FUNCTION

DESCRIPTION

VWET

Supply

Optional input to supply relay wetting current to sense lines in GND/Open operation

50K

to GND

SENSE0

Discrete Input

Discrete input 0. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

SO_1

SO_2

SO_3

S

S

S

S

Ω

SENSE1

Discrete Input

Discrete input 1. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

SENSE2

Discrete Input

Discrete input 2. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

SENSE3

Discrete Input

Discrete input 3. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

SENSE4

Discrete Input

Discrete input 4. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

SENSE5

Discrete Input

Discrete input 5. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

SENSE6

Discrete Input

Discrete input 6. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

SENSE7

Discrete Input

Discrete input 7. If SNSE_SEL = 0 pin senses GND/Open. If SNSE_SEL = 1, senses SUPPLY/Open

Digital Input

If High, SO_n and fault outputs are high-impedance.

has internal 30K

pull-down resistor

SO_0

Digital output

High if SNSE_SEL=0 and SENSE0 <

or Low if SNSE_SEL=1 and SENSE0 >

Digital output

Digital output

Digital output

O_4

Digital output

O_5

Digital output

O_6

Digital output

O_7

Digital output

FAULT_3

Digital output

High if Driver 3 is attempting to sink excess current

DRV_3

Switch Output

Drain node of Ground switch driver 3

GND

Supply

Ground for logic and

DRV_2

DRV_1

DRV_0

DSEL_3

Digital Input

When high, turns on Driver 3. DSEL_3 has an internal 30K

pull-down resistor

VLOGIC

Supply

Logic supply. (3.0V - 5.5V)

OE

OE

Ω

Ω

V,

V

High if SNSE_SEL=0 and SENSE1 < V

, or Low if SNSE_SEL=1 and SENSE1 > V

High if SNSE_SEL=0 and SENSE2 < V

, or Low if SNSE_SEL=1 and SENSE2 > V

High if SNSE_SEL=0 and SENSE3 < V

, or Low if SNSE_SEL=1 and SENSE3 > V

High if SNSE_SEL=0 and SENSE4 < V

, or Low if SNSE_SEL=1 and SENSE4 > V

High if SNSE_SEL=0 and SENSE5 < V

, or Low if SNSE_SEL=1 and SENSE5 > V

High if SNSE_SEL=0 and SENSE6 < V

, or Low if SNSE_SEL=1 and SENSE6 > V

High if SNSE_SEL=0 and SENSE7 < V

, or Low if SNSE_SEL=1 and SENSE7 > V

Analog Ground return for DRV0-3. GND pin and the isolated backside pad should

be grounded for optimum performance and power dissipation.

Switch Output

Drain node of Ground switch driver 2

FAULT_2

Digital output

High if Driver 2 is attempting to sink excess current

FAULT_1

Digital output

High if Driver 1 is attempting to sink excess current

Switch Output

Drain node of Ground switch driver 1

Switch Output

Drain node of Ground switch driver 0

FAULT_0

Digital output

High if Driver 0 is attempting to sink excess current

DSEL_2

Digital Input

When high, turns on Driver 2. DSEL_2 has an internal 30K

pull-down resistor

DSEL_1

Digital Input

When high, turns on Driver 1. DSEL_1 has an internal 30K

pull-down resistor

DSEL_0

Digital Input

When high, turns on Driver 0. DSEL_0 has an internal 30K

pull-down resistor

FAULT_OR Digital Output

High if any Driver is attempting to sink excess current

SNSE_SEL

Digital Input

If Low, SENSE pins are sensing Open/Gnd. If High, SENSE pins sense SUPPLY/Open

LO_SET

Analog input

If

is High, this pin sets the lower window comparator threshold

HI_SET

Analog input

If

is High, this pin sets the upper window comparator threshold

Digital Input

If

is Low, comparator thresholds are set internally.

has an internal 30K

pull-up

LO

HI

LO

HI

LO

HI

LO

HI

LO

HI

LO

HI

LO

HI

LO

HI

Ω

Ω

Ω

Ω

THS_SEL

THS_SEL

THS_SEL

THS_SEL

THS_SEL

PIN DESCRIPTIONS

HI-8425, HI-8426