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参数资料
| 型号： | MAX6955AAX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/43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) |
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MAX6955
2-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Table 7. Register Address Map (continued)
REGISTER
D15
D14
ADDRESS (COMMAND BYTE)
D13 D12 D11 D10
D9
D8
HEX CODE
Write Digit 2a Planes P0 and P1 with Same
Data (7 Segment Only), Reads as 0x00
Write Digit 3a Planes P0 and P1 with Same
Data (7 Segment Only), Reads as 0x00
Write Digit 4a Planes P0 and P1 with Same
Data (7 Segment Only), Reads as 0x00
Write Digit 5a Planes P0 and P1 with Same
Data (7 Segment Only), Reads as 0x00
Write Digit 6a Planes P0 and P1 with Same
Data (7 Segment Only), Reads as 0x00
Write Digit 7a Planes P0 and P1 with Same
Data (7 Segment Only), Reads as 0x00
X
X
X
X
X
X
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
0
0
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
1
0x6A
0x6B
0x6C
0x6D
0x6E
0x6F
Note: Unused register bits read as zero.
START CONDITION
CLOCK PULSE FOR ACKNOWLEDGMENT
SCL
1
2
8
9
SDA
SDA
BY TRANSMITTER
SCL
DATA LINE STABLE, CHANGE OF DATA
DATA VALID
ALLOWED
SDA
BY RECEIVER
S
Figure 5. Bit Transfer
One diode is required per key switch. Note that the for-
ward voltages of the diode and LED must exceed V IH
of P0–P3. If this condition is not met, the voltage input
to the port might be lower than the logic threshold and
keys will not be detected properly.
The MAX6955 can only scan the maximum 32 keys if
the scan-limit register is set to scan the maximum eight
digits. If the MAX6955 is driving fewer digits, then a
maximum of (4 x n) switches can be scanned, where n
is the number of digits set in the scan-limit register. For
example, if the MAX6955 is driving four 14-segment
digits, cathode drivers O0 to O3 are used. Only 16 keys
can be scanned in this configuration; the switches
shown connected to O4 through O7 are not read.
If the user wishes to scan fewer than 32 keys, then
fewer scan lines can be configured for key scanning.
The unused Key_x ports are released back to their orig-
inal GPIO functionality. If key scanning is enabled,
Maxim Integrated
Figure 6. Acknowledge
regardless of the number of keys being scanned,
P4/ IRQ is always configured as IRQ (Table 32).
The key-scanning circuit utilizes the LEDs’ common-
cathode driver outputs as the key-scan drivers. O0 to
O7 go low for nominally 200μs (with OSC = 4MHz) in
turn as the displays are multiplexed. By varying the
oscillator frequency, the debounce time changes,
though key scanning still functions. Key_x inputs have
internal pullup resistors that allow the key condition to
be tested. The Key_x input is low during the appropri-
ate digit multiplex period when the key is pressed. The
timing diagram of Figure 12 shows the normal situation
where all eight LED cathode drivers are used.
15
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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 |
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