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参数资料
| 型号： | AS1115 DB-BLUE |
| 厂商： | ams |
| 文件页数： | 10/26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 - D e t a i l e d D e s c r i p t i o n
I2C Interface
The AS1115 supports the I2C serial bus and data transmission protocol in high-speed mode at 3.4MHz. The AS1115 operates as a slave on the
I2C bus. The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START
and STOP conditions. Connections to the bus are made via the open-drain I/O pins SCL and SDA.
Figure 18. I2C Interface Initialization
1
8
9
1
8
9
0
0
0
0
0
A1
A0 R/W
D15 D14 D13 D12 D11 D10
D9
D8
Default values at power up: A1 = A0 = 0
Figure 19. Bus Protocol
SDI
MSB
Slave Address
R/W
Direction Bit
ACK from
Receiver
ACK from
Receiver
SCL
1
2
6
7
8
9
1
2
3-8
8
9
START
ACK
ACK
Repeat if More Bytes Transferred
STOP or
Repeated
START
The bus protocol (as shown in Figure 19 ) is defined as:
- Data transfer may be initiated only when the bus is not busy.
- During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is
HIGH will be interpreted as control signals.
The bus conditions are defined as:
-
-
-
-
Bus Not Busy . Data and clock lines remain HIGH.
Start Data Transfer . A change in the state of the data line, from HIGH to LOW, while the clock is HIGH, defines a START condition.
Stop Data Transfe r. A change in the state of the data line, from LOW to HIGH, while the clock line is HIGH, defines the STOP condition.
Data Valid . The state of the data line represents valid data, when, after a START condition, the data line is stable for the duration of the
HIGH period of the clock signal. There is one clock pulse per bit of data.
Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of data bytes transferred
between START and STOP conditions is not limited and is determined by the master device. The information is transferred byte-wise and
each receiver acknowledges with a ninth-bit.
Within the I2C bus specifications a high-speed mode (3.4MHz clock rate) is defined.
- Acknowledge : Each receiving device, when addressed, is obliged to generate an acknowledge after the reception of each byte. The mas-
ter device must generate an extra clock pulse that is associated with this acknowledge bit. A device that acknowledges must pull down the
SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge
clock pulse. Of course, setup and hold times must be taken into account. A master must signal an end of data to the slave by not generat-
Revision 1.08
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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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