- 您现在的位置：买卖IC网 > PDF目录20150 > MAX6955AAX+T (Maxim Integrated)IC DRVR DSPL LED 36-SSOP PDF资料下载
参数资料
| 型号： | MAX6955AAX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 19/43页 |
| 文件大小： | 0K |
| 描述： | IC DRVR DSPL LED 36-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 显示器类型： | LED |
| 配置： | 7、14、16 段 |
| 接口： | I²C |
| 电流 - 电源： | 22mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页
MAX6955
2-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Key Debounced Registers
The Key_A debounced, Key_B debounced, Key_C
debounced, and Key_D debounced read-only registers
(Table 35) show which keys have been detected as
debounced by the key-scanning circuit.
Each bit in the register corresponds to one key switch.
The bit is set if the switch has been correctly
debounced since the register was read last. Reading a
debounced register clears that register (after the data
has been read) so that future keys pressed can be
identified. If the debounced registers are not read, the
key-scan data accumulates. However, as there is no
Selecting External Components R SET and
C SET to Set Oscillator Frequency and
Peak Segment Current
The RC oscillator uses an external resistor, R SET , and
an external capacitor, C SET , to set the frequency, f OSC .
The allowed range of f OSC is 1MHz to 8MHz. R SET also
sets the peak segment current. The recommended val-
ues of R SET and C SET set the oscillator to 4MHz, which
makes the blink frequencies selectable between 0.5Hz
and 1Hz. The recommended value of R SET also sets the
peak current to 40mA, which makes the segment cur-
rent adjustable from 2.5mA to 37.5mA in 2.5mA steps.
FIFO in the MAX6955, the user is not able to determine
key order, or whether a key has been pressed more
than once, unless the debounced key status registers
are read after each interrupt, and before the next key-
where:
I SEG = K L /R SET mA
f OSC = K F /(R SET x C SET ) MHz
scan cycle.
Reading any of the four debounced registers clears the
P4/ IRQ output. If a key is pressed and held down, the
key is reported as debounced (and IRQ issued) only
once. The key must be detected as released by the key-
scanning circuit, before it debounces again. If the
debounced registers are being read in response to the
P4/ IRQ being asserted, then the user should generally
read all four registers to ensure that all the keys that were
detected by the key-scanning circuit are discovered.
Key Pressed Registers
The Key_A pressed, Key_B pressed, Key_C pressed,
and Key_D pressed read-only registers (Table 36)
show which keys have been detected as pressed by
the key-scanning circuit during the last test.
Each bit in the register corresponds to one key switch.
The bit is set if the switch has been detected as
pressed by the key-scanning circuit during the last test.
The bit is cleared if the switch has not been detected
as pressed by the key-scanning circuit during the last
test. Reading a pressed register does not clear that
register or clear the P4/ IRQ output.
Display Test Register
The display test register (Table 37) operates in two
modes: normal and display test. Display test mode
turns all LEDs on (including DPs) by overriding, but not
altering, all controls and digit registers (including the
shutdown register), except for the digit-type register
and the GPIO configuration register. The duty cycle,
while in display test mode, is 7/16 (see the Choosing
Supply Voltage to Minimize Power Dissipation section).
Maxim Integrated
K L = 2240
K F = 10K (typ)
R SET = external resistor in k ?
C SET = external capacitor in pF
C STRAY = stray capacitance from OSC pin to GND in pF
The recommended value of R SET is 56k ? and the rec-
ommended value of C SET is 22pF.
The recommended value of R SET is the minimum
allowed value, since it sets the display driver to the
maximum allowed peak segment current. R SET can be
set to a higher value to set the segment current to a
lower peak value where desired. The user must also
ensure that the peak current specifications of the LEDs
connected to the driver are not exceeded.
The effective value of C SET includes not only the actual
external capacitor used, but also the stray capacitance
from OSC to GND. This capacitance is usually in the
1pF to 30pF range, depending on the layout used.
Applications Information
Driving Bicolor LEDs
Bicolor digits group a red and a green die together for
each display element, so that the element can be lit red
or green (or orange), depending on which die (or both)
is lit. The MAX6955 allows each segment’s current to
be set individually from the 1/16th (minimum current
and LED intensity) to 15/16th (maximum current and
LED intensity), as well as off (zero current). Thus, a
bicolor (red-green) segment pair can be set to 256
color/intensity combinations.
19
相关PDF资料 |
PDF描述 |
|---|---|
| TAJC336K020RNJ | CAP TANT 33UF 20V 10% 2312 |
| RSC08DREN | CONN EDGECARD 16POS .100 EYELET |
| VI-24F-EV-F3 | CONVERTER MOD DC/DC 72V 150W |
| VI-24F-EV-F1 | CONVERTER MOD DC/DC 72V 150W |
| RMC08DREN | CONN EDGECARD 16POS .100 EYELET |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6955APL | 制造商:Maxim Integrated Products 功能描述:2-WIRE INTERFACED, 2.7V TO 5.5V LED DISPLAY D - Rail/Tube |
| MAX6955APL+ | 制造商:Maxim from Components Direct 功能描述:MAXIM MAX6955APL+ LED DRIVERS - Rail/Tube 制造商:Maxim Integrated Products 功能描述:LED DRVR 128SEGMENT 2.7V TO 5.5V - Rail/Tube 制造商:Maxim 功能描述:Maxim MAX6955APL+ LED Drivers |
| MAX6955ATL | 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 |
| MAX6955ATL+ | 功能描述:LED显示驱动器 2.7-5.5V 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 |
| MAX6955ATL+T | 功能描述:LED显示驱动器 2.7-5.5V 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 |
发布紧急采购，3分钟左右您将得到回复。