TC7211AM 查看數據表（PDF） - TelCom Semiconductor, Inc
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TC7211AM Datasheet PDF : 7 Pages
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BUS COMPATIBLE, 4-DIGIT
CMOS DECODER/DRIVER
1
TC7211AM
portion duration is less than 1 µsec. The backplane disable
sensing circuit will not respond to such a short signal.
8-DIGIT
LCD
D8 D7 D6 D5 D4 D3 D2 D1
BACKPLANE
BACKPLANE
SLAVE 28
+5V V+
SEGMENTS
HIGH ORDER
GND
B3– CS2 DS2
OSC B0 CS1 DS1 BP
BCD/BINARY 4 4
DATA
BACKPLANE
MASTER 28
+5V V+ SEGMENTS
HIGH ORDER
GND
B3–
CS2 DS2
OSC B0 CS1 DS1 BP
4
CHIP
SELECT
TC7211AM
DIGIT
SELECT
Figure 3. TC7211AM Driving an 8-Digit LCD Display
in Master/Slave Configuration
Input Configuration and Output Codes
The TC7211AM accepts a 4-bit, true binary (positive
level = logic “1”) input at pin 27 (LSB) through pin 30 (MSB).
The binary input is decoded to the 7-segment output known
as Code B. The output display format is 0 to 9, —, E, H, L,
P and blank display (see Table 1). Segment assignments
are shown in Figure 4. The TC7211AM will correctly decode
binary and BCD true codes to a 7-segment output.
The TC7211AM is designed to interface with a data bus
and display data under microprocessor control. Four data
inputs (pins 27–30) and two digit select input bits (pins 31
and 32) are written into input buffer latches. The rising edge
of either chip select causes data to be latched, decoded and
stored in the selected digit output data latch. The 2-bit digit
code selects the appropriate output digit latch. The 4-bit
display data word is decoded to the "Code B" 7-segment
output format.
For applications where bus compatibility is not required,
refer to the TC7211AM (LCD) 4-digit decoder driver data
sheet. This device is designed to accept multiplexed BCD/
binary input data for display under the control of four sepa-
rate digit select control signals.
Table 1. Binary Codes Versus Character Displayed
Binary Input
B3 B2 B1 B0
2 Character Displayed
(Code B)
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
0
1
2
3
4
5
6
7
3
8
9
—
E
H
L
P
Blank
4
A
FGB
E
C
D
5
Figure 4. Segment Assignment
Special Order Decoder Option
The TC7211AM is mask programmed to give the 16
combinations of 7-segment output codes. For large volume
6 orders (50K pieces minimum), custom decoder options are
available. Contact TelCom Semiconductor for details.
7
TELCOM SEMICONDUCTOR, INC.
8
6-13
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