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参数资料
| 型号： | MAX6959BAPE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC DRVR DSPL LED 16-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 25 |
| 显示器类型： | LED |
| 配置： | 7 段 + 2 个信号器 |
| 接口： | SMBus（2 线/I²C） |
| 数字或字符： | 4 位数字 |
| 电流 - 电源： | 5.9mA |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
Ports and Key Scanning
(MAX6959 Only)
The MAX6959 features two input ports, INPUT1 and
INPUT2. These two ports can be used as general-pur-
pose logic inputs, or configured to perform automatic
keyscanning. Both ports have internal pullup resistors
enabled in shutdown and normal operation for both
general-purpose input mode and keyscanning mode.
The ports can be read using the 2-wire interface.
The keyscan logic uses one or both of the INPUT1 and
INPUT2 logic inputs (Figure 12). An interrupt output that
flags key presses is optional. The interrupt flag can be
read (polled) through the serial interface instead, allow-
ing IRQ/SEG9 to be used as an open-drain general-
purpose logic output or as a segment driver.
One small-signal diode is required per key switch when
more than one key is connected to INPUT1 or INPUT2.
The diodes prevent two simultaneous key switch
depressions from shorting digit drivers together. For
example, if KEY0 and KEY1 were pressed together
(Figure 12) and the diodes were not fitted, DIG0/SEG0
and DIG1/SEG1 would be shorted together and the
LED multiplexing would be incorrect. These diodes can
be common-anode dual diodes in SOT23 like BAW56.
A diode is not required for a single key connection to
INPUT1 or INPUT2. Therefore, up to two key switches
can be directly connected without adding diodes
(Figure 13).
Resistors R1 and R2 are required if the MAX6959 is
operated with V+ greater than 4V. R1 and R2 are
optional if V+ is between 3V and 4V.
DIG0/SEG0
The keyscanning circuit utilizes the LED’s common-
cathode driver outputs as the keyscan drivers. The out-
puts DIG0/SEG0 to DIG3/SEG3 pulse low for nominally
320μs sequentially as the displays are multiplexed. The
actual low time varies from 5μs to 315μs due to pulse-
width modulation from 1/64th to 63/64th for intensity
control. The timing diagram (Figure 14) shows the typi-
cal situation when all four LED cathode drivers are used.
The maximum eight keys can be scanned only if the
scan-limit register is set to scan the maximum four dig-
its. If fewer than four digits are driven, then only (2 x n)
switches can be scanned, where n is the number of dig-
its (1, 2, 3, or 4) set in the scan-limit register (Table 14).
The keyscan cycle loops continuously over time, with
all eight keys experiencing a full keyscanning
debounce over 41ms (Figure 14). A key press is
debounced and an interrupt issued if at least one key
that was not pressed in a previous cycle is found
pressed during both sampling periods. The keyscan
circuit detects any combination of keys pressed during
each debounce cycle (n-key rollover).
Port Configuration Register
(MAX6959 Only)
The port configuration register configures INPUT1,
INPUT2, and IRQ/SEG9 ports for the MAX6959 (Table 16).
IRQ/SEG9 can be set to either an LED segment output
(driving four multiplexed LED segments), or an open-
drain logic output. The open-drain logic output can be
configured as either an IRQ output controlled by the
keyscan circuitry, or as a general-purpose logic output
controlled through the 2-wire interface. Connect a
Key0
Key4
DIG1/SEG1
Key1
Key5
DIG0/SEG0
Key4
Key0
DIG2/SEG2
Key2
Key6
V+
R1
V+
DIG3/SEG3
Key3
R1
39k ?
Key7
INPUT1
INPUT2
R2
39k ?
39k ?
V+
4.7k ?
INPUT1
INPUT2
R2
39k ?
V+
4.7k ?
IRQ/SEG9
MICROCONTROLLER INTERRUPT
IRQ/SEG9
MICROCONTROLLER INTERRUPT
Figure 12. Maximum Keyscan Configuration
Figure 13. Keyscanning Two Keys Without Diodes
14
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相关代理商/技术参数 |
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|---|---|
| MAX6959BAPE+ | 功能描述:LED显示驱动器 3-5.5V 4-Digit 9-Seg 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 |
| MAX6959EVKIT+ | 功能描述:LED 照明开发工具 Evaluation Board RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX695C/D | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX695C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX695CPE | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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