MAX1367 Maxim Integrated Products, MAX1367 Datasheet - Page 13

• Manufacturer Part Number: MAX1367
• Description: (MAX1365 / MAX1367) Digit Panel Meters
• Manufacturer: Maxim Integrated Products

Figure 2. Segment Connection for the MAX1365 (4.5 Digits)
The MAX1365/MAX1367 use a multiplexing scheme to
drive one digit at a time. The scan rate is fast enough to
make the digits appear to be lit. Figure 5 shows the
data-timing diagram for the MAX1365/MAX1367 where
T is the display scan period (typically around 1/512Hz
or 1.9531ms). T
time each digit is on and is calculated as follows:
The MAX1365/MAX1367 allow for full decimal-point
control and feature leading-zero suppression.
Use the DPON, DPSET1, and DPSET2 bits in the con-
trol register to set the value of the decimal point (Tables
2 and 3). The MAX1365/MAX1367 overrange and
underrange display is shown in Table 4.
The MAX1365/MAX1367 include a leading-zero sup-
pression circuitry to turn off unnecessary zeros. For
example, when DPSET1 and DPSET2 = [0,0], 0.0 is dis-
played instead of 000.0 (MAX1365). This feature saves
a substantial amount of power by not lighting unneces-
sary LEDs.
The MAX1365/MAX1367 also include an interdigit-
blanking circuitry. Without this feature, it is possible to
Figure 3. Segment Connection for the MAX1367 (3.5 Digits)
F
DIGIT 4
D
A
G
F
DIGIT 4
D
G
A
T
ON
C
B
DP
F
E
ON
=
DIGIT 3
C
B
______________________________________________________________________________________
DP
G
D
T
5
A
Stand-Alone, 4.5-/3.5-Digit Panel Meters
F
E
in Figure 5 denotes the amount of
=
DIGIT 3
B
Leading-Zero Suppression
C
G
D
1 95312
A
DP
.
E
F
B
C
DIGIT 2
Decimal-Point Control
A
DP
G
D
5
E
F
DIGIT 2
C
ms
B
Interdigit Blanking
A
G
D
DP
E
F
=
C
B
DIGIT 1
DP
A
390 60
G
D
E
F
DIGIT 1
B
C
.
A
G
D
DP
F
E
µ
B
C
DIGIT 0
s
A
DP
G
D
C
B
DP
see a faint digit next to a digit that is completely on.
The interdigit-blanking circuitry prevents ghosting over
into the next digit for a short period of time. The typical
interdigit blanking time is 4µs.
Table 1. LED Priority Table
X = Don’t care.
Table 2. Decimal-Point Control Table—
MAX1365
Table 3. Decimal-Point Control Table—
MAX1367
Table 4. LED During Overrange and
Underrange Conditions
DPON
DPON
HOLD
0
0
0
0
1
1
1
1
CONDITION
1
1
1
1
Underrange
Overrange
1
0
0
with 4–20mA Output
DPSET1
DPSET1 DPSET2
0
0
1
1
0
0
1
1
0
0
1
1
PEAK
DPSET2
X
1
0
0
1
0
1
0
1
0
1
0
1
0
1
MAX1367
-1---
1---
Hold value
Peak value
Latest ADC result
DISPLAY
DISPLAY
OUTPUT
OUTPUT
DISPLAY VALUES FORM
1888.8
188.88
18.888
1.8888
18888
18888
18888
18888
1888.
188.8
18.88
1.888
MAX1365
ZERO INPUT
ZERO INPUT
READING
READING
-1----
1----
0.0000
0.000
0.000
0.00
0.00
0.0
0.0
0
0
0
0
0.
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