GA1621

LCD 驱动电路

GA1621 Pad Coordinates

GA1621 Pad Descriptions

Pad No.

Pad Name

I/O

Description

Chip selection input with pull-high resistor.

When the CS- is logic high, the data and command read from or written to the GA1621

are disabled. The serial interface circuit is also reset. But if CS- is at logic low level and

is input to the CS- pad, the data and command transmission between the host controller

and the GA1621 are all enabled.

1

CS-

I

READ clock input with pull-high resistor.

Data in the RAM of the GA1621 are clocked out on the falling edge of the RD- signal.

The clocked out data will appear on the DATA line. The host controller can use the next

rising edge to latch the clocked out data.

2

RD-

I

WRITE clock input with pull-high resistor. Data on the DATA line are latched into the

GA1621 on the rising edge of the WR-signal.

3

WR-

I

4

DATA

I/O

Serial data input/output with pull-high resistor

5

GND

--

Negative power supply, ground

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6

OSCO

O

The OSCI and OSCO pads are connected to a 32.768kHz crystal in order to generate a

system clock. If the system clock comes from an external clock source, the external

clock source should be connected to the OSCI pad. But if and on-chip RC oscillator is

selected instead, the OSCI and OSCO pads can be left open.

7

OSCI

I

8

VLCD

I

VLCD I LCD power input

9

VDD

--

Positive power supply

10

IRQ

O

Time base or WDT overflow flag, NMOS open drain output

11,12

BZ,BZ-

O

2kHz or 4kHz tone frequency output pair

13~116

COM0~COM3

O

LCD common outputs

48~17

SEG0 ~ 31

O

LCD segment outputs

GA1621 Absolute Maximum Ratings

Storage Temperature ------------------ -50 ℃ ~ 125℃

Supply Voltage ---------------------- -0.3V ~ 5.5V

Operating Temperature ---------------- -25 ℃ ~ 75 ℃

Input Voltage -------- VSS - 0.3V ~ VDD + 0.3V