9
ICM7228
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 DIGIT 1 Output LED Display Digits 1, 2, 5 and 8 Drive Lines.
16 DlGlT 2
17 DIGIT 5
18 DlGlT 8
19 V
DD
Supply Device Positive Power Supply Rail.
20 DIGIT 4 Output LED Display Digits 4, 7, 6 and 3 Drive Lines.
21 DlGlT 7
22 DlGlT 6
23 DIGlT 3
24 SEG f Output LED Display Segments f, d, g and a Drive Lines.
25 SEG d
26 SEG g
27 SEG a
28 V
SS
Supply Device Ground or Negative Power Supply Rail.
TABLE 2. ICM7228B PIN ASSIGNMENTS AND DESCRIPTIONS
PIN NO. NAME FUNCTION DESCRIPTION
1 DIGIT 4 Output LED Display Digits 4, 6, 3 and 1 Drive Lines.
2 DlGlT 6
3 DIGIT 3
4 DlGlT 1
5ID6,
(HEXA/CODE B
)
Input When “MODE” Low: Display Data Input, Bit 7.
When “MODE” High: Control Bit, Decoding Scheme Selection: High, Hexadecimal
Decoding; Low, Code B Decoding.
6 ID5, (DECODE
) Input When “MODE” Low: Display Data Input, Bit 6.
When “MODE” High: Control Bit, Decode/No Decode Selection: High, No Decode; Low, Decode.
7ID7,
(DATA COMING)
Input 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.
TABLE 1. ICM7228A PIN ASSIGNMENTS AND DESCRIPTIONS (Continued)
PIN NO. NAME FUNCTION DESCRIPTION
