MAX1497 Maxim, MAX1497 Datasheet - Page 14

• Manufacturer Part Number: MAX1497
• Description: 3.5- and 4.5-Digit / Single-Chip ADCs with LED Drivers and C Interface
• Manufacturer: Maxim

3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
Table 2. Decimal-Point Control Table—MAX1499
Table 3. Decimal-Point Control Table—MAX1497
Table 4. LED During Overrange and
Underrange Conditions
Figure
14
X = Don’t care.
SEGDP
SEGG
SEGF
SEGE
SEGD
SEGC
SEGB
SEGA
CONDITION
Underrange
Overrange
______________________________________________________________________________________
DPON
DPON
5. Two-Digit Common-Cathode Configuration
0
0
0
0
1
1
1
1
X
X
X
X
A
B
C
F
E
DIGIT 1
D
G
D
A
E
B
DPSET1
C
DPSET1
DP
F
MAX1497
0
0
1
1
0
0
1
1
G
0
0
1
1
-
1
1
---
---
DP
A
B
C
E
F
DPSET2
DPSET2
DIGIT 2
D
A
G
D
MAX1499
0
1
0
1
0
1
0
1
0
1
0
1
E
-
1
C
1
B
----
----
F
DP
G
DP
DISPLAY OUTPUT
DISPLAY OUTPUT
Figure
tion for two digits. In common-cathode configuration,
the cathodes of all LEDs in a digit are connected
together. Each segment driver of the MAX1497/
MAX1499 connects to its corresponding LEDs anodes.
For example, segment driver SEGA connects to all LED
segments designated as A. Similar configurations are
followed for other segment drivers.
The MAX1497/MAX1499 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.
data timing diagrams for the MAX1497/MAX1499 where T
is the display scan period typically around 1/512Hz or
1.9531ms for the MAX1499 and 1/640Hz or 1.5625ms for
the MAX1497. T
of time each digit is on and is calculated as follows:
The MAX1497/MAX1499 allow for full decimal-point
control and feature leading-zero suppression. Use the
DPON, DPSET1, and DPSET2 bits in the control register
to set the value of the decimal point
The MAX1497/MAX1499 overrange and underrange
display is shown in
1888.8
188.88
18.888
1.8888
18888
18888
18888
18888
188.8
18.88
1.888
1888
T
T
ON
ON
5 shows a typical common-cathode configura-
=
=
T
T
5
4
=
=
ON
1 95312
1 5625
.
.
in Figures 6 and 7 denotes the amount
Table 4.
4
5
ms
ms
=
ZERO INPUT READING
ZERO INPUT READING
=
390 60
390 60
.
.
Figures 6 and 7
µ
0.0000
0.000
0.000
µ
s MAX
0.00
0.00
0.0
0.0
s MAX
0
0
0
0
0
(Tables 2 and
(
(
1497
1499
)
)
show
3).