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参数资料
| 型号： | SC668ULTRT |
| 厂商： | Semtech |
| 文件页数： | 24/46页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR LMU 8CH MLPQUT20 |
| 特色产品： | Semtech sc667 and sc668 |
| 标准包装： | 1 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 12 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，LED 闪烁器，照明管理装置（LMU） |
| 频率： | 400kHz |
| 电源电压： | 2.9 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-UFQFN 裸露焊盘 |
| 供应商设备封装： | 20-MLPQ（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC668ULDKR |
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SC668
Serial Interface
The SC668 is a read-write slave-mode I C device and com-
TheI 2 CGeneralSpecification
2
plies with the Philips I 2 C standard Version 2.1, dated
January 2000. The SC668 has twenty-three user-accessible
internal 8-bit registers. The I 2 C interface has been designed
for program flexibility, supporting direct format for write
operation. Read operations are supported on both com-
bined format and stop separated format. While there is no
auto increment/decrement capability in the SC668 I 2 C
logic, a tight software loop can be designed to randomly
access the next register independent of which register
you begin accessing. The start and stop commands frame
the data-packet and the repeat start condition is allowed
if necessary.
SC668 Limitations to the I 2 C Specifications
The SC668 only recognizes seven bit addressing. This
means that ten bit addressing and CBUS communication
are not compatible. The device can operate in either stan-
dard mode (100kbit/s) or fast mode (400kbit/s).
Slave Address Assignment
The seven bit slave address is 1110 000x. The eighth bit is
the data direction bit. E0h is used for a write operation,
and E1h is used for a read operation.
Supported Formats
The supported formats are described in the following
subsections.
Direct Format — Write
the appropriate 8 bit data byte. Once again, the slave
acknowledges and the master terminates the transfer with
the stop condition [P].
Combined Format — Read
After the start condition [S], the slave address is sent, fol-
lowed by an eighth bit indicating a write. The SC668 I 2 C
then acknowledges that it is being addressed, and the
master responds with an 8 bit data byte consisting of the
register address. The slave acknowledges and the master
sends the repeated start condition [Sr]. Once again, the
slave address is sent, followed by an eighth bit indicating
a read. The slave responds with an acknowledge and the
8 bit data from the previously addressed register; the
master then sends a non-acknowledge (NACK). Finally, the
master terminates the transfer with the stop condition [P].
Stop Separated Reads
Stop-separated reads can also be used. This format allows
a master to set up the register address pointer for a read
and return to that slave at a later time to read the data. In
this format the slave address followed by a write command
are sent after a start [S] condition. The SC668 then
acknowledges it is being addressed, and the master
responds with the 8-bit register address. The master sends
a stop or restart condition and may then address another
slave. After performing other tasks, the master can send a
start or restart condition to the SC668 with a read
command. The device acknowledges this request and
returns the data from the register location that had previ-
ously been set up.
The simplest format for an I 2 C write is direct format. After
the start condition [S], the slave address is sent, followed
by an eighth bit indicating a write. The SC668 I 2 C then
acknowledges that it is being addressed, and the master
responds with an 8 bit data byte consisting of the register
address. The slave acknowledges and the master sends
24
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