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参数资料
| 型号： | AS1115 DB-BLUE |
| 厂商： | ams |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO AS1115 BLUE |
| 标准包装： | 1 |
| 输出及类型： | 8，非隔离 |
| 特点： | 64 LED + 16 键，I²C |
| 输入电压： | 2.7 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | AS1115 |
AS1115
Datasheet - Ty p i c a l A p p l i c a t i o n
8x8 Dot Matrix Mode
The application example in Figure 27 shows the AS1115 in the 8x8 LED dot matrix mode.
The LED columns have common cathodes and are connected to the DIG0:7 outputs. The rows are connected to the segment drivers. Each of
the 64 LEDs can be addressed separately. The columns are selected via the digits as listed in Table 6 on page 12 .
The Decode Enable Register ( see page 13 ) must be set to ‘00000000’ as described in Table 8 on page 13 . Single LEDs in a column can
be addressed as described in Table 11 on page 15 , where bit D0 corresponds to segment G and bit D7 corresponds to segment DP.
Figure 27. Application Example as LED Dot Matrix Driver
V DD
2.7 to 5V
9.53k ?
I SET
DIG0 to
DIG7
SEG A to G
μP
SDA
SCL
IRQ
SDA
SCL
IRQ
AS1115
SEP DP
Diode Arrangement
GND
Keyscan
The key readback of the AS1115 can be used either for push buttons as well as switches. If only a single key is pressed (shorted) at a time no
additional diodes are required. If a detection of multiple simultaneous keystrokes is required diodes within the keypath, as shown in Figure 28 ,
are required. Pressing multiple keys without the diodes would result in ambiguous results. Since KEYA and KEYB have independent inputs only
keys on the same path are affected.
Figure 28. Keyscan Configuration
SEGA
SEGB
SEGC
SEGD
SEG E
SEGF
SEGG
SEGDP
KEYA
KEYB
IRQ
Diodes are optional and only required if multiple keystrokes must be
detected simultaneously.
If I2C Self-Addressing is used these two keys cannot be used for read-
back and must be either hard wired opened or shorted.
A short writes a logical “0” whereas an open writes a logical “1” as
address bit.
Note: If the blink_en bit (bit D4 in the Feature Register 0x0E) is set to ‘1’, the keyscan is not returning a valid value.
Supply Bypassing and Wiring
In order to achieve optimal performance the AS1115 should be placed very close to the LED display to minimize effects of electromagnetic inter-
ference and wiring inductance.
Furthermore, it is recommended to connect a 10 F and a 0.1 F ceramic capacitor between pins V DD and GND to avoid power supply ripple
Revision 1.08
20 - 25
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS1115DB-BLUE | 制造商:AMS 功能描述:Demoboard for AS1115 LED Driver (Blue LED's) |
| AS1115-DB-Green | 制造商:ams 功能描述:AS1115 Demo Brd w/green LED |
| AS1115-DB-Red | 制造商:ams 功能描述:AS1115 Demo Brd w/red LEDs |
| AS1115DB-RED | 制造商:AMS 功能描述:Demoboard for AS1115 LED Driver (Red LED's) |
| AS1115-DB-White | 功能描述:显示开发工具 AS1115 Demo Brd w/white LED RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
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