7

FN3158.7

April 17, 2006

The ICM7211AM is intended to accept data from a data bus

under processor control.

In these devices, the four data input bits and the two-bit digit

address (DA1 pin 31, DA2 pin 32) are written into input

buffer latches when both chip select inputs (CS1 pin 33, CS2

pin 34) are taken low. On the rising edge of either chip select

input, the content of the data input latches is decoded and

stored in the output latches of the digit selected by the

contents of the digit address latches.

An address of 00 writes into D4, DA2 = 0, DA1 = 1 writes into

D3, DA2 = 1, DA1 = 0 writes into D2, and 11 writes into D1.

The timing relationships for inputting data are shown in

Figure 1, and the chip select pulse widths and data setup and

hold times are specified under Operating Characteristics.

11

00

11

01

11

10

11

11

BLANK

TABLE 1. OUTPUT CODES (Continued)

BlNARY

CODE B

ICM7211AM

B3

B2

B1

BO

a

b

c

d

f

g

e

FIGURE 5. SEGMENT ASSIGNMENT

Test Circuit

FIGURE 6.

13

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

17

18

19

20

28

40

39

38

37

36

35

34

33

32

31

30

29

27

26

25

24

23

22

21

DIGIT/CHIP

ICM7211AM

DATA

INPUTS

SELECT

INPUTS

OSC

BP

MICROPROCESSOR

VERSION

MULTIPLEXED

VERSION

EACH SEGMENT

OUTPUT TO

BACKPLANE

WITH A 200pF

CAPACITOR

+

-

ICM7211AM

ICM7211AM