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| 型號(hào)： | SI1140DK |
| 廠商： | Silicon Laboratories Inc |
| 文件頁(yè)數(shù)： | 93/250頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL SI1143-A10-GM |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuickSense™ |
| 傳感器類(lèi)型： | 近程，紅外線和環(huán)境光 |
| 接口： | USB |
| 電源電壓： | 5V，USB |
| 嵌入式： | 是，MCU，8 位 |
| 已供物品： | 板 |
| 已用 IC / 零件： | C8051F800，Si1143 |
| 其它名稱： | 336-1971 |
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C8051F80x-83x
182
Rev. 1.0
All transactions are initiated by a master, with one or more addressed slave devices as the target.
The
master generates the START condition and then transmits the slave address and direction bit. If the trans-
action is a WRITE operation from the master to the slave, the master transmits the data a byte at a time
waiting for an ACK from the slave at the end of each byte. For READ operations, the slave transmits the
data waiting for an ACK from the master at the end of each byte. At the end of the data transfer, the master
generates a STOP condition to terminate the transaction and free the bus. Figure 26.3 illustrates a typical
SMBus transaction.
Figure 26.3. SMBus Transaction
26.3.1. Transmitter Vs. Receiver
On the SMBus communications interface, a device is the “transmitter” when it is sending an address or
data byte to another device on the bus. A device is a “receiver” when an address or data byte is being sent
to it from another device on the bus. The transmitter controls the SDA line during the address or data byte.
After each byte of address or data information is sent by the transmitter, the receiver sends an ACK or
NACK bit during the ACK phase of the transfer, during which time the receiver controls the SDA line.
26.3.2. Arbitration
A master may start a transfer only if the bus is free. The bus is free after a STOP condition or after the SCL
and SDA lines remain high for a specified time (see Section “26.3.5. SCL High (SMBus Free) Timeout” on
page 183). In the event that two or more devices attempt to begin a transfer at the same time, an arbitra-
tion scheme is employed to force one master to give up the bus. The master devices continue transmitting
until one attempts a HIGH while the other transmits a LOW. Since the bus is open-drain, the bus will be
pulled LOW. The master attempting the HIGH will detect a LOW SDA and lose the arbitration. The winning
master continues its transmission without interruption; the losing master becomes a slave and receives the
rest of the transfer if addressed. This arbitration scheme is non-destructive: one device always wins, and
no data is lost.
26.3.3. Clock Low Extension
SMBus provides a clock synchronization mechanism, similar to I2C, which allows devices with different
speed capabilities to coexist on the bus. A clock-low extension is used during a transfer in order to allow
slower slave devices to communicate with faster masters. The slave may temporarily hold the SCL line
LOW to extend the clock low period, effectively decreasing the serial clock frequency.
26.3.4. SCL Low Timeout
If the SCL line is held low by a slave device on the bus, no further communication is possible. Furthermore,
the master cannot force the SCL line high to correct the error condition. To solve this problem, the SMBus
protocol specifies that devices participating in a transfer must detect any clock cycle held low longer than
25 ms as a “timeout” condition. Devices that have detected the timeout condition must reset the communi-
cation no later than 10 ms after detecting the timeout condition.
When the SMBTOE bit in SMB0CF is set, Timer 3 is used to detect SCL low timeouts. Timer 3 is forced to
reload when SCL is high, and allowed to count when SCL is low. With Timer 3 enabled and configured to
SLA6
SDA
SLA5-0
R/W
D7
D6-0
SCL
Slave Address + R/W
Data Byte
START
ACK
NACK
STOP
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| SI1141 | 制造商:SILABS 制造商全稱:SILABS 功能描述:PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE |
| Si1141-A10-GM | 功能描述:近程傳感器 IC INTERFACE RoHS:否 制造商:Vishay Semiconductors 感應(yīng)方式:Optical 感應(yīng)距離:1 mm to 200 mm 電源電壓:2.5 V to 3.6 V 安裝風(fēng)格:SMD/SMT 輸出配置:Digital 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 系列:VCNL3020 |
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| Si1141-A11-GMR | 功能描述:近程傳感器 I2C Proximity Amb Light Sensor 1 LED RoHS:否 制造商:Vishay Semiconductors 感應(yīng)方式:Optical 感應(yīng)距離:1 mm to 200 mm 電源電壓:2.5 V to 3.6 V 安裝風(fēng)格:SMD/SMT 輸出配置:Digital 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 系列:VCNL3020 |
| SI1141-A11-YM0R | 功能描述:Optical Sensor Ambient 450nm I2C 10-WFQFN 制造商:silicon labs 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類(lèi)型:環(huán)境 波長(zhǎng):450nm 接近探測(cè):是 輸出類(lèi)型:I2C 電壓 - 電源:1.71 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-WFQFN 供應(yīng)商器件封裝:10-QFN（2x2） 標(biāo)準(zhǔn)包裝:1 |
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