ICM7228 Datasheet, PDF (10/17 Pages) Intersil Corporation – 8-Digit, Microprocessor- Compatible, LED Display Decoder Driver

ICM7228
TABLE 2. ICM7228B PIN ASSIGNMENTS AND DESCRIPTIONS (Continued)
PIN NO.
NAME
FUNCTION
DESCRIPTION
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
V_DD
20 SEG c
Supply
Output
Device Positive Power Supply Rail.
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
V_SS
Supply Device Ground or Negative Power Supply Rail.
PIN NO.
NAME
1
SEG c
2
SEG e
3
SEG b
4
DP
5
DA0
6
DA1
7
ID7,
(INPUT DP)
8
WRITE
9
HEXA/CODE
B/SHUTDOWN
10 DA2
11 ID1
12 ID0
13 ID2
14 ID3
15 DIGIT 1
16 DlGlT 2
17 DIGIT 5
18 DlGlT 8
19
V_DD
TABLE 3. ICM7228C PIN ASSIGNMENTS AND DESCRIPTIONS
FUNCTION
DESCRIPTION
Output LED Display Segments c, e, band Decimal Point Drive Lines.
Input
Input
Input
Input
Input
Input
Input
Digit Address Input, Bit 1 LSB.
Digit Address Input, Bit 2.
Display Decimal Point Data Input, Negative True.
Data Input Will Be Written to Display RAM on Rising Edge of WRITE.
Three Level Input. Display Function Control: High, Hexadecimal Decoding; Float, Code B
Decoding; Low, Oscillator, and Display Disabled.
Digit Address Input, Bit 3, MSB.
Display Data Inputs.
Output LED Display Digits 1, 2, 5 and 8 Drive Lines.
Supply Device Positive Power Supply Rail.
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