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参数资料
| 型号： | AS1115 DB-YELLOW |
| 厂商： | ams |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO AS1115 YELLOW |
| 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 - D e t a i l e d D e s c r i p t i o n
Table 11. No-Decode Mode Data Bits and Corresponding Segment Lines
D7
D6
D5
D4
D3
D2
D1
D0
Corresponding Segment Line
DP
A
B
C
D
E
F
G
I2C Self Addressing
If this feature is used, 2 of the 16 key readback nodes can be left open or shorted for self-addressing. This is done with KEYA together with
SEGG (A0) and SEGF (A1). This two nodes cannot be used for key-readback in this case. After startup all devices have the predefined address
0000000. A single command for self addressing will update all connected AS1115. This command has to be done after startup or every time the
AS1115 gets disconnected from the supply. The I2C address definition must be done with fixed connection, since I2C detection is excluded from
debounce time of key registers.geht
Note: A short writes a logical “0” whereas an open writes a logical “1” as address bit (see Figure 26) .
Table 12. Self Addressing Register (Address (HEX) = 0x2D))
D7
D6
D5
D4
D3
D2
D1
D0
Factory-set IC address
User-set IC address
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
Figure 26. Address Coding
Keyscan Register
These two registers contain the result of the keyscan input of the 16 keys. To ensure proper results the data in these registers are updated only
if the logic data scanned is stable for 20ms (debounce time). A change of the data stored within these two registers is indicated by a logic low on
the IRQ pin. The IRQ is high-impedance if a read operation on the key scan registers is started.
Table 13. LED Diagnostic Register Address
Register HEX Address
0x1C
0x1D
Key
KEYA
KEYB
D7
DP
D6
A
D5
B
Segment
D4
C
D3
D
D2
E
D1
F
D0
G
Note: If I2C self addressing is used segment G&F of KEYA is used for the two LSB of the I2C address. In this case these two nodes cannot be
used as a key. Additionally the debounce time is disabled for these two bits.
The data within the keyscan register is updated continuously during every cycle (1/10 of refresh rate). Therefore, to get a valid read-
back of keys it is recommended to read out the keyscan registers immediately after the IRQ is triggered. A short writes a logical “0”
whereas an open writes a logical “1” as keyscan register 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.
Revision 1.08
15 - 25
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相关代理商/技术参数 |
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| AS1115M | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Adjustable Voltage Regulator |
| AS1115M3 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| AS1115M3-1.5 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| AS1115M3-2.5 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| AS1115M3-3.0 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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