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

ICM7228
Typical Performance Curves (Continued)
300
-55^oC
200
25^oC
100
125^oC
0
0
1.0
2.0
3.0
4.0
5.0
V_DIG (V)
FIGURE 7. COMMON CATHODE DIGIT DRIVER I_DIG vs V_DIG
-55^oC
25^oC
0
125^oC ¹⁰
20
30
40
50
5.0
4.0
3.0
2.0
1.0
0
V_DD-V_SEG (V)
FIGURE 8. COMMON CATHODE SEGMENT DRIVER I_SEG vs
(V_DD - V_SEG)
PIN NO.
NAME
1
SEG c
2
SEG e
3
SEG b
4
DP
5
ID6,
(HEXA/CODE B)
6
ID5, (DECODE)
7
ID7,
(DATA COMING)
8
WRITE
9
MODE
10 ID4,
(SHUTDOWN)
11 ID1
12 ID0
13 ID2
14 ID3
TABLE 1. ICM7228A PIN ASSIGNMENTS AND DESCRIPTIONS
FUNCTION
DESCRIPTION
Output LED Display Segments c, e, b and Decimal Point Drive Lines.
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
When “MODE” Low: Display Data Input, Bit 7.
When “MODE” High: Control Bit, Decoding Scheme Selection: High, Hexadecimal
Decoding; Low, Code B Decoding.
When “MODE” Low: Display Data Input, Bit 6.
When “MODE” High: Control Bit, Decode/No Decode Selection: High, No Decode; Low, Decode.
When “MODE” Low: Display Data Input, Bit 8, Decimal Point Data.
When “MODE” High: Control Bit, Sequential Data Update Select: High, Data Coming; Low,
No Data Coming.
Data Input Will Be Written to Control Register or Display RAM on Rising Edge of WRITE.
Selects Data to Be Loaded to Control Register or Display RAM: High, Loads Control
Register; Low, Loads Display RAM.
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.
When “MODE” Low: Display Data Input, Bit 2.
When “MODE” High and “ID7 (DATA COMING)” Low: Digit Address, Bit 2, Single Digit
Update Mode.
When “MODE” Low: Display Data Input, Bit 1.
When “MODE” High and “ID7 (DATA COMING)” Low: Digit Address, LSB, Single Digit
Update Mode.
When “MODE” Low: Display Data Input, Bit 3.
When “MODE” High and “ID7 (DATA COMING)” Low: Digit Address, MSB, Single Digit
Update Mode.
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
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