Owner's manual
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
ON
in Figure 5 denotes the amount of
time each digit is on and is calculated as follows:
Decimal-Point Control
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.
Leading-Zero Suppression
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.
Interdigit Blanking
The MAX1365/MAX1367 also include an interdigit-
blanking circuitry. Without this feature, it is possible to
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.
T
Tms
s
ON
== =
5
1 95312
5
390 60
.
. µ
MAX1365/MAX1367
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
______________________________________________________________________________________ 13
A
B
C
A AAA
D
DIGIT 4 DIGIT 3 DIGIT 2 DIGIT 1 DIGIT 0
D DDD
E
G
F
EEE
GGGG
F FFF
BBBB
CC CC
DP DP DP DP DP
Figure 2. Segment Connection for the MAX1365 (4.5 Digits)
A
B
AA A
D
DIGIT 4 DIGIT 3 DIGIT 2 DIGIT 1
DDD
E
G
F
EE
GGG
FFF
BBB
CC C
DP DP DP DP
C
Figure 3. Segment Connection for the MAX1367 (3.5 Digits)
HOLD PEAK DISPLAY VALUES FORM
1XHold value
01Peak value
00Latest ADC result
Table 1. LED Priority Table
X = Don’t care.
DPON
DPSET1
DPSET2
DISPLAY
OUTPUT
ZERO INPUT
READING
10 0 1888. 0.
10 1 188.8 0.0
11 0 18.88 0.00
11 1 1.888 0.000
Table 3. Decimal-Point Control Table—
MAX1367
CONDITION MAX1367 MAX1365
Overrange 1--- 1----
Underrange -1--- -1----
Table 4. LED During Overrange and
Underrange Conditions
DPON
DPSET1
DPSET2
DISPLAY
OUTPUT
ZERO INPUT
READING
00 018888 0
00 118888 0
01 018888 0
01 118888 0
10 01888.8 0.0
10 1188.88 0.00
11 018.888 0.000
11 11.8888 0.0000
Table 2. Decimal-Point Control Table—
MAX1365