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参数资料
| 型号： | MAX6964AEG+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LINEAR 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 开路漏极，PWM |
| 输出数： | 17 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，LED 闪烁器 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 400kHz |
| 电源电压： | 2 V ~ 3.6 V |
| 输出电压： | 7V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
17-Output LED Driver/GPO with
Intensity Control and Hot-Insertion Protection
enabled with the global intensity flag G in the configu-
ration register (Table 4). When global PWM control is
used, the 4 bits of master intensity and 4 bits of global
intensity effectively combine to provide an 8-bit, 240-
step intensity control applying to all outputs.
It is not possible to apply global PWM control to a sub-
set of the ports, and use the others as logic outputs. To
mix static logic outputs and PWM outputs, individual
PWM control must be selected (Table 8).
Applications Information
Hot Insertion
The RST input, BLINK input, and serial interface SDA,
SCL, AD0 remain high impedance with up to 6V assert-
ed on them when the MAX6964 is powered down (V+ =
0V). Ouptut ports O0–O16 remain high impedance with
up to 8V asserted on them. The MAX6964 can therefore
be used in hot-swap applications.
Output Level Translation
The open-drain output architecture allows the ports to
level translate the outputs to higher or lower voltages
than the MAX6964 supply. An external pullup resistor
can be used on any output to convert the high-imped-
ance logic-high condition to a positive voltage level.
The resistor can be connected to any voltage up to 7V.
For interfacing CMOS inputs, a pullup resistor value of
220k ? is a good starting point. Use a lower resistance
to improve noise immunity, in applications where power
consumption is less critical, or where a faster rise time
is needed for a given capacitive load.
Driving LED Loads
When driving LEDs, a resistor in series with the LED
must be used to limit the LED current to no more than
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
50mA. Choose the resistor value according to the fol-
Figure 13. Master Set to 1/15
.
lowing formula:
R LED = (V SUPPLY - V LED - V OL ) / I LED
where:
.
14 15 1
2
3
4
5
6
7
8
9 10 11 12 13 14
15 1
2
R LED is the resistance of the resistor in series with the
LED ( ? ).
Figure 14. Master Set to 14/15
.
.
V SUPPLY is the supply voltage used to drive the LED (V).
V LED is the forward voltage of the LED (V).
V OL is the output low voltage of the MAX6964 when
sinking I LED (V).
14
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
2
I LED is the desired operating current of the LED (A).
.
Figure 15. Master Set to 15/15
MASTER INTENSITY TIMESLOT
NEXT MASTER INTENSITY TIMESLOT
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
Figure 16. Individual (or Global) Set to 1/16
MASTER INTENSITY TIMESLOT
NEXT MASTER INTENSITY TIMESLOT
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
Figure 17. Individual (or Global) Set to 15/16
MASTER INTENSITY TIMESLOT CONTROL IS IGNORED
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
Figure 18. Individual (or Global) Set to 16/16
______________________________________________________________________________________
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