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參數(shù)資料
| 型號： | MAX7221 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual 4-Input Positive-AND Gates 14-CDIP -55 to 125 |
| 中文描述： | 串行接口、8位、LED顯示驅(qū)動器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 186K |
| 代理商： | MAX7221 |
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(8mA) + (5.25V - 1.8V)(31/32 x
40mA x 8) = 1.11W
Thus, for a CERDIP package (
θ
J A
= +60°C/W from
Table 12), the maximum allowed ambient temperature
T
A
is given by:
T
J (MAX)
= T
A
+ PD x
θ
J A
+ 150°C = T
A
+1.11W x
60°C/W
where T
A
= +83.4°C.
Casc ading 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 Registersection for additional infor-
mation.
M
S erially Interfac ed, 8-Digit LED Display Drivers
______________________________________________________________________________________
11
Table 11. R
SET
vs. Segment Current and
LED Forward Voltage
Table 12. Package Thermal Resistance
Data
12.2
17.8
29.8
66.7
1.5
40
30
20
10
11.0
15.8
25.9
59.3
2.5
11.8
17.1
28.0
63.7
9.69
14.0
22.6
51.2
V
LED
(V)
10.6
15.0
24.5
55.4
2.0
3.5
3.0
I
SEG
(mA)
24 Narrow DIP
24 Wide SO
PACKAGE
+85°C/W
24 CERDIP
Maximum Ambient Temperature (T
A
) = +85°C
Maximum J unction Temperature (T
J
) = +150°C
+60°C/W
THERMAL RESISTANCE
(
θ
JA
)
+75°C/W
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX7221CWG | Dual 4-Input Positive-AND Gates 14-CFP -55 to 125 |
| MAX7221ERG | Dual 4-Input Positive-AND Gates 14-CDIP -55 to 125 |
| MAX7221EWG | Dual 4-Input Positive-AND Gates 20-LCCC -55 to 125 |
| MAX7221CNG | Serially Interfaced, 8-Digit LED Display Drivers |
| MAX7219CWG | Serially Interfaced, 8-Digit LED Display Drivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7221C/D | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Serially Interfaced, 8-Digit LED Display Drivers |
| MAX7221CNG | 功能描述:LED顯示驅(qū)動器 8-Digit LED Display Driver RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX7221CNG+ | 功能描述:LED顯示驅(qū)動器 8-Digit LED Display Driver RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| MAX7221CNG+ | 制造商:Maxim Integrated Products 功能描述:DRIVER LED DISPLAY 8DIGIT 24DIP 制造商:Maxim Integrated Products 功能描述:DRIVER, LED DISPLAY, 8DIGIT, 24DIP 制造商:Maxim Integrated Products 功能描述:DRIVER, LED DISPLAY, 8DIGIT, 24DIP; Topology:Common Cathode; No. of Outputs:16; Output Current:320mA; Output Voltage:4.5V; Driver Case Style:DIP; Input Voltage Min:4V; Input Voltage Max:5.5V; Dimming Control Type:Analogue, Digital; ;RoHS Compliant: Yes |
| MAX7221CWG | 功能描述:LED顯示驅(qū)動器 Integrated Circuits (ICs) RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
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