10

ICM7228

8WRITE

Input

Data Input Will Be Written to Control Register or Display RAM on Rising Edge of WRITE.

9

MODE

Input

Selects Data to Be Loaded to Control Register or Display RAM: High, Loads Control Register;

Low, Loads Display RAM.

10

ID4,

(SHUTDOWN)

Input

When “MODE” Low: Display Data Input, Bit 5.

When “MODE” High: Control Bit, Low Power Mode Select: High, Normal Operation; Low,

Oscillator and Display Disabled.

11

ID1

Input

When “MODE” Low: Display Data Input, Bit 2.

When “MODE” High and “ID7 (DATA COMING)” Low: Digit Address, Bit 2, Single Digit Update

Mode.

12

ID0

Input

When “MODE” Low: Display Data Input, Bit 1.

When “MODE” High and “ID7 (DATA COMING)” Low: Digit Address, LSB, Single Digit Update

Mode.

13

ID2

Input

When “MODE” Low: Display Data Input, Bit 3.

When “MODE” High and “ID7 (DATA COMING)” Low: Digit Address, MSB, Single Digit Update

Mode.

14

ID3

Input

When “MODE” Low: Display Data Input, Bit 4.

When “MODE” High: RAM Bank Select (Decode Modes Only): High, RAM Bank A; Low, RAM

Bank B.

15

DP

Output

LED Display Decimal Point and Segments a, b, and d Drive Lines

16

SEG a

17

SEG b

18

SEG d

19

Supply

Device Positive Power Supply Rail.

20

SEG c

Output

LED Display Segments c, e, f and g Drive Lines.

21

SEG e

22

SEG f

23

SEG g

24

DIGIT 8

Output

LED Display Digits 8, 2, 5 and 7 Drive Lines.

25

DIGIT 2

26

DIGIT 5

27

DIGIT 7

28

Supply

Device Ground or Negative Power Supply Rail.

TABLE 3. ICM7228C PIN ASSIGNMENTS AND DESCRIPTIONS

PIN NO.

NAME

FUNCTION

DESCRIPTION

1

SEG c

Output

LED Display Segments c, e, band Decimal Point Drive Lines.

2

SEG e

3

SEG b

4DP

5

DA0

Input

Digit Address Input, Bit 1 LSB.

6

DA1

Input

Digit Address Input, Bit 2.

7ID7,

(INPUT DP)

Input

Display Decimal Point Data Input, Negative True.

8WRITE

Input

Data Input Will Be Written to Display RAM on Rising Edge of WRITE.

TABLE 2. ICM7228B PIN ASSIGNMENTS AND DESCRIPTIONS (Continued)

PIN NO.

NAME

FUNCTION

DESCRIPTION