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ICM7245

8-Character 16-Segment Microprocessor Compatible LED Display Decoder Driver


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ICM7245 pdf
8-Character, 16-Segment, Microprocessor Compatible,
LED Display Decoder Driver
ICM7245
The ICM7245 is an 8-character, alphanumeric display driver
and controller which provides all the circuitry required to
interface a microprocessor or digital system to a 16-segment
display with internal pull-up resistors. It is primarily intended
for use in microprocessor systems, where it minimizes
hardware and software overhead. Incorporated on-chip are a
64-character ASClI decoder, 8x6 memory, high power
character and segment drivers, and the multiplex scan
circuitry.
6-bit ASCll data to be displayed is written into the memory
directly from the microprocessor data bus. Data location
depends upon the selection of either Sequential (MODE = 1) or
Random access mode (MODE = 0). In the Sequential Access
mode the first entry is stored in the lowest location and
displayed in the “left-most” character position. Each
subsequent entry is automatically stored in the next higher
location and displayed to the immediate “right” of the previous
entry. A DISPlay FULL signal is provided after 8 entries; this
signal can be used for cascading devices together. A CLR pin is
provided to clear the memory and reset the location counter.
The Random Access mode allows the processor to select the
memory address and display digit for each input word.
The character multiplex scan runs whenever data is not being
entered. It scans the memory and CHARacter drivers, and
ensures that the decoding from memory to display is done in
the proper sequence. Intercharacter blanking is provided to
avoid display ghosting.
Features
• Single supply +3.3V operation
• 16-Segment fonts with decimal point
• Up to 8 character display driver
• Has internal pull-up resistors of 136Typical
• Microprocessor compatible
• Directly drives LED common cathode displays
• Cascadable without additional hardware
• Standby feature turns display off; puts chip in low power
mode
• Sequential entry or random entry of data into display
• Character and segment drivers, All MUX scan circuitry, 8x6
static memory and 64-character ASCll font generator
included on-chip
• Pb-free (RoHS compliant)
Ordering Information
PART NUMBER
(Note 2)
PART MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG. DWG. #
ICM7245AIM44Z
ICM7245 AIM44Z
-25°C to +85°C
44 Ld MQFP
Q44.10x10
ICM7245AIM44ZT (Note 1)
ICM7245 AIM44Z
-25°C to +85°C
44 Ld MQFP (Tape and Reel) Q44.10x10
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ICM7245. For more information on MSL, please see tech brief TB363.
October 29, 2013
FN8587.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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ICM7245 pdf
Pin Configuration
ICM7245
ICM7245 (16-SEGMENT CHARACTER)
(44 LD MQFP)
TOP VIEW
SEG d1
SEG a1
SEG a2
D0
D1
D2
D3
D4
D5
CS
NC
144 43 42 41 40
39
38
37 36
35 34
33
2 32
3 31
4 30
5 29
6 28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
SEG d2
DP
SEG h
SEG j
MODE
A0/SEN
A1/CLR
A2/DISP FULL
OSC/OFF
CHAR1
NC
Pin Descriptions
SIGNAL
PIN
FUNCTION
D0 - D5
4 thru 9 6-Bit ASCll Data input pins (active high).
CS 10 Chip Select from µP address decoder, etc.
WR 13 WRite pulse input pin (active low). For an active high write pulse, CS can be used.
MODE
29 Selects data entry MODE. High selects Sequential Access (SA) mode where first entry is displayed
in “leftmost” character and subsequent entries appear to the “right”. Low selects Random Access
(RA) mode where data is displayed on the character addressed via A0 thru A2 Address pins.
A0/SEN
28 In RA mode it is the LSB of the character Address. In SA mode it is used for cascading devices for
displays of more than 8 characters (active high enables device controller).
A1/CLR
27 In RA mode this is the second bit of the address. In SA mode, a low input will CLeaR the Serial
Address Counter, the Data Memory and the display.
A2/DISP FULL
26 In RA mode this is the MSB of the Address. In SA mode, the output goes high after 8 entries,
indicating DISPlay FULL.
OSC/OFF
25 OSCillator input pin. Adding capacitance to VDD will lower the internal oscillator frequency. An
external oscillator can be applied to this pin. A low at this input sets the device into a (shutdown)
mode, shutting OFF the display and oscillator but retaining data stored in memory.
SEG d1, SEG a1, SEG a2;
SEG j, SEG h, DP, SEG d2, SEG f, SEG i,
SEG b, SEG g2, SEG I;
SEG m, SEG e, SEG g1, SEG k, SEG c
1 thru 3,
30 thru 38
40 thru 44
SEGment driver outputs.
CHAR8 thru CHAR5,
CHAR4 thru CHAR2, CHAR1
14 thru 17, CHARacter driver outputs.
19 thru 21, 24
VSS 18 Supply Ground.
VDD 39 Positive Power Supply +3.0V to +3.6V.
NC 11, 12, 22, 23 No connection.
2 FN8587.0
October 29, 2013



Part Number ICM7245
Description 8-Character 16-Segment Microprocessor Compatible LED Display Decoder Driver
Maker INTERSIL - INTERSIL
Total Page 13 Pages
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