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參數(shù)資料
| 型號(hào)： | MAX1497 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | 3.5- and 4.5-Digit. Single-Chip ADCs with LED Drivers and 礐 Interface |
| 中文描述： | 3位半和4位半、單片ADC，帶有LED驅(qū)動(dòng)器和µC接口 |
| 文件頁(yè)數(shù)： | 14/33頁(yè) |
| 文件大小： | 665K |
| 代理商： | MAX1497 |
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M
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and μC Interface
14
______________________________________________________________________________________
Figure 5 shows a typical common-cathode configura-
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. Figures 6 and 7 show
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
ON
in Figures 6 and 7denotes the amount
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 (Tables 2 and 3).
The MAX1497/MAX1499 overrange and underrange
display is shown in Table 4.
T
T
5
ms
s MAX
(
μ
T
T
4
ms
s MAX
(
μ
ON
ON
=
=
=
=
=
=
1 95312
.
5
390 60
1499
1 5625
.
4
390 60
1497
.
)
.
)
A
A
A
DIGIT 1
DIGIT 2
SEGDP
SEGG
SEGF
SEGE
SEGD
SEGC
SEGB
SEGA
D
D
E
E
G
G
F
F
B
B
C
C
DP
DP
B
C
D
E
F
G
DP
A
B
C
D
E
F
G
DP
Figure 5. Two-Digit Common-Cathode Configuration
Table 2. Decimal-Point Control Table—MAX1499
DPON
0
0
0
0
1
1
1
1
DPSET1
0
0
1
1
0
0
1
1
DPSET2
0
1
0
1
0
1
0
1
DISPLAY OUTPUT
18888
18888
18888
18888
1888.8
188.88
18.888
1.8888
ZERO INPUT READING
0
0
0
0
0.0
0.00
0.000
0.0000
Table 3. Decimal-Point Control Table—MAX1497
DPON
DPSET1
X
0
X
0
X
1
X
1
X
= Don’t care.
DPSET2
0
1
0
1
DISPLAY OUTPUT
188.8
18.88
1888
1.888
ZERO INPUT READING
0.0
0.00
0
0.000
Table 4. LED During Overrange and
Underrange Conditions
CONDITION
Overrange
Underrange
MAX1497
1
---
-
1
---
MAX1499
1
----
-
1
----
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