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参数资料
| 型号： | MAX1368ECM+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | IC PANEL METER 3.5 DIG 48LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 250 |
| 显示器类型： | LED |
| 配置： | 7 段显示 |
| 接口： | 串行 |
| 数字或字符： | A/D，3.5 位数字 |
| 电源电压： | 2.7 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
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Microcontroller-Interface, 4.5-/3.5-Digit Panel
Meters with 4–20mA Output
Table 1. LED Priority Table
F
A
B
F
A
G
B
F
A
G
B
F
A
G
B
F
A
G
B
SEG_SEL
SPI/ ADC
HOLD
PEAK
DISPLAY VALUES
FORM
D
G
C
E
DP
D
C
E
DP
D
C
E
DP
D
C
E
DP
D
C
DP
1
X
X
X
LED segment
registers
DIGIT 4
DIGIT 3
DIGIT 2
DIGIT 1
DIGIT 0
0
1
X
X
LED display register
(user written)
Figure 2. Segment Connection for the MAX1366 (4.5 Digits)
A
A
A
A
0
0
0
X = Don’t care.
0
0
0
1
0
0
X
1
0
LED display register
Peak register
ADC result register
F
D
G
DIGIT 4
B
C
F
E
DP
G
D
DIGIT 3
B
C
F
E
DP
G
D
DIGIT 2
B
C
F
E
DP
G
D
DIGIT 1
B
C
DP
Figure 4 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 MAX1366/
MAX1368 connects to its corresponding LED’s anodes.
Figure 3. Segment Connection for the MAX1368 (3.5 Digits)
clock source for best 50Hz/60Hz rejection perfor-
mance. Other external clock frequencies allow for cus-
tom conversion rates. A 2.4576MHz clock signal
reduces the conversion rate and the LED update rate
by a factor of two while keeping good 50Hz/60Hz noise
rejection. The MAX1366/MAX1368 operate with an
external clock source of up to 5.05MHz.
Charge Pump
For example, segment driver SEGA connects to all LED
segments designated as A. Similar configurations are
used for other segment drivers.
The MAX1366/MAX1368 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 MAX1366/MAX1368 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:
= = 390 . 60 μ s
The MAX1366/MAX1368 contain an internal charge pump
to provide the negative supply voltage for the internal
analog input/reference buffers. The bipolar input range of
t ON =
t
5
1 . 95312 ms
5
the analog input/reference buffers allows this device to
accept negative inputs with high source impedances.
Connect a 0.1μF capacitor from NEGV to GND.
LED Driver (Table 1)
The MAX1366 has a 4.5-digit common-cathode display
driver, and the MAX1368 has a 3.5-digit common-cath-
ode display driver.
Figures 2 and 3 show the connection schemes for a
standard seven-segment LED display. The LED update
rate is 2.5Hz.
The MAX1366/MAX1368 automatically display the results
of the ADC, if desired. The MAX1366/MAX1368 also
allow independent control of the LED driver through the
serial interface, allowing for data processing of the ADC
result before showing the result on the LED. Additionally,
each LED segment can be individually controlled (see
the LED Segment-Display Register sections).
Decimal-Point Control
The MAX1366/MAX1368 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 MAX1366/MAX1368 overrange and
underrange display is shown in Table 4 .
Current Output
The MAX1366/MAX1368 feature a 4–20mA (0 to 16mA)
current output for driving remote panel meters, data log-
gers, and process controllers in industrial applications.
The DAC output is proportional to the input of the ADC
and LED display. In the simplest configuration, connect
DAC_VOUT directly to CONV_IN to have the current out-
put (4–20mA or 0 to 16mA) follow the analog inputs.
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1368ECM+ | 功能描述:LED显示驱动器 Stand-Alone 3.5Digit Panel Meters RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX1368ECM+T | 功能描述:LED显示驱动器 Stand-Alone 3.5Digit Panel Meters RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX1368ECM-T | 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX136C/D | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX136CJL | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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