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参数资料
| 型号： | MAX6957AAI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/25页 |
| 文件大小： | 0K |
| 描述： | IC DRVR DSPL LED 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 显示器类型： | LED |
| 配置： | 7、16、20 段 |
| 接口： | 4 线串行 |
| 电流 - 电源： | 180µA |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port LED Display Driver and I/O Expander
Table 3. Register Address Map (continued)
REGISTER
D15
D14
COMMAND ADDRESS
D13 D12 D11 D10
D9
D8
HEX
CODE
8 ports 16–23 (data bits D0–D7)
8 ports 17–24 (data bits D0–D7)
8 ports 18–25 (data bits D0–D7)
8 ports 19–26 (data bits D0–D7)
8 ports 20–27 (data bits D0–D7)
8 ports 21–28 (data bits D0–D7)
8 ports 22–29 (data bits D0–D7)
8 ports 23–30 (data bits D0–D7)
8 ports 24–31 (data bits D0–D7)
7 ports 25–31 (data bits D0–D6. D7 reads as 0)
6 ports 26–31 (data bits D0–D5. D6, D7 read as 0)
5 ports 27–31 (data bits D0–D4. D5–D7 read as 0)
4 ports 28–31 (data bits D0–D3. D4–D7 read as 0)
3 ports 29–31 (data bits D0–D2. D3–D7 read as 0)
2 ports 30–31 (data bits D0–D1. D2–D7 read as 0)
1 port 31 only (data bit D0. D1–D7 read as 0)
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
R/ W
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0x50
0x51
0x52
0x53
0x54
0x55
0x56
0x57
0x58
0x59
0x5A
0x5B
0x5C
0x5D
0x5E
0x5F
Note: Unused bits read as 0.
Display Test Register
Display test mode turns on all ports configured as LED
drivers by overriding, but not altering, all controls and
port registers, except the port configuration register
( Table 14). Only ports configured as LED drivers are
affected. Ports configured as GPIO push-pull outputs
do not change state. In display test mode, each port's
current is temporarily set to 1/2 the maximum current
limit as controlled by R ISET .
Selecting External Component R ISET
to Set Maximum Segment Current
The MAX6957 uses an external resistor R ISET to set the
maximum segment current. The recommended value,
39k Ω , sets the maximum current to 24mA, which makes
the segment current adjustable from 1.5mA to 24mA in
1.5mA steps.
To set a different segment current, use the formula:
R ISET = 936k Ω / I SEG
where I SEG is the desired maximum segment current in mA.
The recommended value of R ISET is 39k Ω .
The recommended value of R ISET is the minimum
allowed value, since it sets the display driver to the
maximum allowed segment current. R ISET can be a
higher value to set the segment current to a lower maxi-
mum value where desired. The user must also ensure
that the maximum current specifications of the LEDs
connected to the driver are not exceeded.
The drive current for each segment can be controlled
through programming either the global current register
(Table 9) or individual segment current registers
(Tables 10, 11, and 12), according to the setting of the
current control bit of the configuration register (Table 7).
These registers select the LED’s constant-current drive
from 16 equal fractions of the maximum segment cur-
rent. The current difference between successive cur-
rent steps, I STEP , is therefore determined by the
formula:
I STEP = I SEG / 16
If I SEG = 24mA, then I STEP = 24mA / 16 = 1.5mA.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6957AAX | 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 |
| MAX6957AAX/GG8 | 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 |
| MAX6957AAX/GH9 | 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 |
| MAX6957AAX/GH9-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 |
| MAX6957AAX+ | 功能描述:LED显示驱动器 2.5-5.5V 20/28Port 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 |
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