參數(shù)資料
型號(hào)： LIS331DLMTR
廠商： STMICROELECTRONICS
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PBCC16
封裝： 3 X 3 MM, 1 MM HEIGHT, ROHS COMPLIANT, LGA-16
文件頁(yè)數(shù)： 10/37頁(yè)
文件大?。?/td> 615K
代理商： LIS331DLMTR
Digital interfaces
LIS331DLM
18/37
5.1.1
I2C operation
The transaction on the bus is started through a START (ST) signal. A START condition is
defined as a HIGH to LOW transition on the data line while the SCL line is held HIGH. After
this has been transmitted by the Master, the bus is considered busy. The next byte of data
transmitted after the start condition contains the address of the slave in the first 7 bits and
the eighth bit tells whether the Master is receiving data from the slave or transmitting data to
the slave. When an address is sent, each device in the system compares the first seven bits
after a start condition with its address. If they match, the device considers itself addressed
by the Master.
The slave address (SAD) associated to the LIS331DLM is 000100xb. SDO/SA0 pad can be
used to modify less significant bit of the device address. If SA0 pad is connected to voltage
supply, LSb is ‘1’ (address 0001001b) else if SA0 pad is connected to ground, LSb value is
‘0’ (address 0001000b). This solution permits to connect and address two different
accelerometers to the same I2C lines.
Data transfer with acknowledge is mandatory. The transmitter must release the SDA line
during the acknowledge pulse. The receiver must then pull the data line LOW so that it
remains stable low during the HIGH period of the acknowledge clock pulse. A receiver which
has been addressed is obliged to generate an acknowledge after each byte of data
received.
The I2C embedded inside the LIS331DLM behaves like a slave device and the following
protocol must be adhered to. After the start condition (ST) a slave address is sent, once a
slave acknowledge (SAK) has been returned, a 8-bit sub-address (SUB) will be transmitted:
the 7 LSb represent the actual register address while the MSB enables address auto
increment. If the MSb of the SUB field is ‘1’, the SUB (register address) will be automatically
increment to allow multiple data read/write.
The slave address is completed with a Read/Write bit. If the bit was ‘1’ (Read), a repeated
START (SR) condition will have to be issued after the two sub-address bytes; if the bit is ‘0’
(Write) the Master will transmit to the slave with direction unchanged. Table 10 explains how
the SAD+Read/Write bit pattern is composed, listing all the possible configurations.
Table 10.
SAD+Read/Write patterns
Command
SAD[6:1]
SAD[0] = SA0
R/W
SAD+R/W
Read
000100
0
1
00010001 (11h)
Write
000100
0
00010000 (10h)
Read
000100
1
00010011 (13h)
Write
000100
1
0
00010010 (12h)
Table 11.
Transfer when master is writing one byte to slave
Master
ST
SAD + W
SUB
DATA
SP
Slave
SAK
Table 12.
Transfer when master is writing multiple bytes to slave:
Master
ST
SAD + W
SUB
DATA
SP
Slave
SAK
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PDF描述
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參數(shù)描述
LIS331DLTR 功能描述:加速計(jì) - 板上安裝 MEMS MOTION SENSOR 3-AXIS RoHS:否 制造商:Murata 傳感軸:Double 加速:12 g 靈敏度: 封裝 / 箱體: 輸出類型:Analog 數(shù)字輸出 - 位數(shù):11 bit 電源電壓-最大:5.25 V 電源電壓-最小:4.75 V 電源電流:4 mA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C
LIS331HH 功能描述:加速計(jì) - 板上安裝 MEMS Digital Sensor 3-axes Nano RoHS:否 制造商:Murata 傳感軸:Double 加速:12 g 靈敏度: 封裝 / 箱體: 輸出類型:Analog 數(shù)字輸出 - 位數(shù):11 bit 電源電壓-最大:5.25 V 電源電壓-最小:4.75 V 電源電流:4 mA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C
LIS331HHTR 功能描述:加速計(jì) - 板上安裝 MEMS digital output L-Power Motion Snsr RoHS:否 制造商:Murata 傳感軸:Double 加速:12 g 靈敏度: 封裝 / 箱體: 輸出類型:Analog 數(shù)字輸出 - 位數(shù):11 bit 電源電壓-最大:5.25 V 電源電壓-最小:4.75 V 電源電流:4 mA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C
LIS332AR 功能描述:加速計(jì) - 板上安裝 Digital 2.4v - 3.3v 100 Noise 0.3mA RoHS:否 制造商:Murata 傳感軸:Double 加速:12 g 靈敏度: 封裝 / 箱體: 輸出類型:Analog 數(shù)字輸出 - 位數(shù):11 bit 電源電壓-最大:5.25 V 電源電壓-最小:4.75 V 電源電流:4 mA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C
LIS332ARTR 功能描述:加速計(jì) - 板上安裝 MEMS MOTION SENSOR RoHS:否 制造商:Murata 傳感軸:Double 加速:12 g 靈敏度: 封裝 / 箱體: 輸出類型:Analog 數(shù)字輸出 - 位數(shù):11 bit 電源電壓-最大:5.25 V 電源電壓-最小:4.75 V 電源電流:4 mA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C
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