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参数资料
| 型号： | MAX7221EWG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC DRVR DSPLY LED 8DIG 24SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 30 |
| 显示器类型： | LED |
| 配置： | 7 段 + DP |
| 接口： | 4 线串行 |
| 数字或字符： | 8 位数字 |
| 电流 - 电源： | 330mA |
| 电源电压： | 4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 24-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 1424 (CN2011-ZH PDF) |
MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
Table 11. R SET vs. Segment Current and
LED Forward Voltage
Table 12. Package Thermal Resistance
Data
I SEG (mA)
40
30
20
1.5
12.2
17.8
29.8
2.0
11.8
17.1
28.0
V LED (V)
2.5
11.0
15.8
25.9
3.0
10.6
15.0
24.5
3.5
9.69
14.0
22.6
PACKAGE
24 Narrow DIP
24 Wide SO
24 CERDIP
THERMAL RESISTANCE
( θ JA )
+75°C/W
+85°C/W
+80°C/W
10
66.7
63.7
59.3
55.4
51.2
Maximum Junction Temperature (T J ) = +150°C
Maximum Ambient Temperature (T A ) = +85°C
Computing Power Dissipation
The upper limit for power dissipation (PD) for the
MAX7219/MAX7221 is determined from the following
equation:
PD = (V+ x 8mA) + (V+ - V LED )(DUTY x I SEG x N)
where:
V+ = supply voltage
DUTY = duty cycle set by intensity register
N = number of segments driven (worst case is 8)
V LED = LED forward voltage
I SEG = segment current set by R SET
Dissipation example:
I SEG = 40mA, N = 8, DUTY = 31/32, V LED = 1.8V at
40mA, V+ = 5.25V
PD = (5.25V x 8mA) + (5.25V - 1.8V)(31/32 x
40mA x 8) = 1.11W
Thus, for a CERDIP package ( θ JA = +80°C/W from
Table 12), the maximum allowed ambient temperature
T A is given by:
T J(MAX) = T A + PD x θ JA
150°C = T A +1.11W x 80°C/W
where T A = +61.2°C.
The T A limits for PDIP and SO packages in the dissipation
example above are +66.7°C and +55.6°C, respectively.
Maxim Integrated
Cascading Drivers
The example in Figure 3 drives 16 digits using a 3-wire
μP interface. If the number of digits is not a multiple of
8, set both drivers’ scan limits registers to the same
number so one display will not appear brighter than the
other. For example, if 12 digits are need, use 6 digits
per display with both scan-limit registers set for 6 digits
so that both displays have a 1/6 duty cycle per digit. If
11 digits are needed, set both scan-limit registers for 6
digits and leave one digit driver unconnected. If one
display for 6 digits and the other for 5 digits, the sec-
ond display will appear brighter because its duty cycle
per digit will be 1/5 while the first display’s will be 1/6.
Refer to the No-Op Register section for additional infor-
mation.
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7221EWG+ | 功能描述:LED显示驱动器 8-Digit LED Display Driver 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 |
| MAX7221EWG+T | 功能描述:LED显示驱动器 8-Digit LED Display Driver 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 |
| MAX7221EWG-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 |
| MAX722C/D | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX722CSE | 功能描述:直流/直流开关调节器 3.3V Palmtop/LCD Power Supply Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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