Integrated Circuits

ICM7228B
8-digit LED display decoder/driver, common cathode
PDF datasheet
       
DIGIT 4 1  • 28 GND
DIGIT 6 2 27 DIGIT 7
DIGIT 3 3 26 DIGIT 5
DIGIT 1 4 25 DIGIT 2
ID6 5 24 DIGIT 8
ID5 6 23 SEG g
ID7 7 22 SEG f
WRITE 8 21 SEG e
MODE 9 20 SEG c
ID4 10 19 Vcc
ID1 11 18 SEG d
ID0 12 17 SEG b
ID2 13 16 SEG a
ID3 14 15 DP
       
Pin Symbol Description
1 DIGIT 4 digit 4 cathode
2 DIGIT 6 digit 6 cathode
3 DIGIT 3 digit 3 cathode
4 DIGIT 1 digit 1 cathode
5 ID6 data bit 6 (HEXA/CODE-B )
6 ID5 data bit 5 (DECODE )
7 ID7 data bit 7 (DATA COMING)
8 WRITE write (active low, low-to-high edge triggered)
9 MODE mode select (control or data word)
10 ID4 data bit 4 (SHUTDOWN )
11 ID1 data bit 1
12 ID0 data bit 0
13 ID2 data bit 2
14 ID3 data bit 3
15 DP decimal point anode
16 SEG a segment a anode
17 SEG b segment b anode
18 SEG d segment d anode
19 Vcc supply voltage
20 SEG c segment c anode
21 SEG e segment e anode
22 SEG f segment f anode
23 SEG g segment g anode
24 DIGIT 8 digit 8 cathode
25 DIGIT 2 digit 2 cathode
26 DIGIT 5 digit 5 cathode
27 DIGIT 7 digit 7 cathode
28 GND ground


Specifications
(typical values under recommended operating conditions, unless specified)
Parameter Value Unit
Display scan rate 390 Hz
Inter-digit blanking time 10 µs
Write pulse width 100 (low)
540 (high) 		ns
Mode setup time 150 ns
Data setup time 160 ns
Minimum digit drive capability 50 mA
Segment driver output impedance 100 Ω
Peak current drive per segment 10 mA

Notes
  • When MODE is low, data is loaded into display RAM. When MODE is high, data is loaded into control register.

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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