HI-8050/51, HI-8150/51

PIN DESCRIPTION TABLE

VSS

POWER

0 Volts

LOGIC INPUT Open or high logic level selects the HI-8010/HI-8110

/

logic. A low

selects the HI-8020/HI-8120 Logic (HI-8050 & HI-8150 only)

LOGIC INPUT Chip select - Active low

LOGIC INPUT Serial data input clock - Active low

LD

LOGIC INPUT Latches data in shift register to the segment outputs - Active high

DIN

LOGIC INPUT Serial input data to the shift register

BPIN

INPUT

Backplane frequency input. Either driven from an external source or connected

to BPOSC and an external resistor and capacitor.

BPOSC

OUTPUT

Internal oscillator pin. Connected to BPIN and an external resistor and capacitor

VDD

POWER

+5V ±5%, Positive voltage of the backplane and segments

CONVOSC

INPUT

Used in conjunction with CONVOUT to generate the negative VEE voltage

on-chip (HI-8050 & HI-8150 only).

CONVOUT

OUTPUT

Used in conjunction with CONVOSC to generate the negative VEE voltage

on-chip (HI-8050 & HI-8150 only).

VEE

POWER

Negative voltage of the backplane and segments - between VSS and VDD - 35V

S1 to S38

OUTPUT

Segment outputs to LCD display

BPOUT

OUTPUT

Backplane output to LCD display (See Figure 3 for cascading drivers)

T1

LOGIC INPUT Used in conjunction with T2 to control display mode. Normal mode is logic low.

T2

LOGIC INPUT Used in conjunction with T1 to control display mode. Normal mode is logic low.

DOUT30

OUTPUT

Logic output from the 30th bit of the shift register. Use for pattern

verification or as the DIN of the next cascaded driver (HI-8050 & HI-8150 only).

DOUT32

OUTPUT

DOUT38

OUTPUT

SIGNAL

FUNCTION

DESCRIPTION

8020OPT

CL CS

CS

CL

Logic output from the 32nd bit of the shift register. Use for pattern

verification or as the DIN of the next cascaded driver (HI-8050 & HI-8150 only).

Logic output from the 38th bit of the shift register. Use for pattern

verification or as the DIN of the next cascaded driver.

HOLT INTEGRATED CIRCUITS

2