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HCLA0025GB 参数 Datasheet PDF下载

HCLA0025GB图片预览
型号: HCLA0025GB
PDF下载: 下载PDF文件 查看货源
内容描述: 微型扩增低压传感器 [Miniature amplified low pressure sensors]
分类和应用: 传感器
文件页数/大小: 15 页 / 192 K
品牌: SENSORTECHNICS [ SENSORTECHNICS GMBH ]
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HCLA Series  
Miniature amplified low pressure sensors  
I²C BUS  
DATA valid (D): State of data line represents valid data when,  
Introduction  
after START condition, data line is stable for duration of  
The HCLA is capable to generate a digital output signal.  
The device runs a cyclic program, which will store a corrected  
pressure value with 12 bit resolution about every 250 µs  
within the output registers of the internal ASIC. In order to  
use the sensor for digital signal readout, it should be  
connected to a bidirectional I²C-bus.  
HIGH period of clock signal. Data on line must be  
changed during LOW period of clock signal. There is  
one clock pulse per bit of data.  
Acknowledge (A): Data is transferred in pieces of 8 bits  
(1 byte) on serial bus, MSB first. After each byte receiving  
device – whether master or slave – is obliged to pull  
data line LOW as acknowledge for reception of data.  
Master must generate an extra clock pulse for this pur-  
pose. When acknowledge is missed, slave transmitter  
becomes inactive. It is on master either to send last com-  
mand again or to generate STOP condition in that case.  
According to the I²C-bus specification, the bus is controlled  
by a master device, which generates the clock signal,  
controls the bus access and generates START and STOP  
conditions. The HCLA is designed to work as a slave, hence  
it will only respond to requests from a master device.  
Digital I²C interface  
Slave address: The I²C-bus master-slave concept requires  
a unique address for each device. The HCLA has a  
preconfigured slave address (1111000xb). By factory  
programming it is possible to define a secondary slave  
address additional to the general one. According to I²C  
specification 127 different addresses are available. The  
sensor will then listen to both slave addresses. After  
generating a START condition the master sends the  
address byte containing a 7 bit address followed by a  
data direction bit (R/W). A "0" indicates a transmission  
from master to slave (WRITE), a "1" indicates a data  
request (READ).  
The HCLA complies with the following protocol (Fig. 1):  
Bus not busy: During idle periods both data line (SDA) and  
clock line (SCL) remain HIGH.  
START condition (S): HIGH to LOW transition of SDA line  
while clock (SCL) is HIGH is interpreted as START con-  
dition. START conditions are always generated by the  
master. Each initial request for a pressure value has to  
begin with a START condition.  
STOP condition (P): LOW to HIGH transition of SDA line while  
clock (SCL) is HIGH determines STOP condition. STOP  
conditions are always generated by the master. More than  
one request for the current pressure value can be trans-  
mitted without generation of intermediate STOP condition.  
DATA operation: The sensor starts to send 2 data bytes  
containing the current pressure value as a 15 bit  
information placed in the output registers.  
SCL  
SDA  
START  
condition  
Data  
valid  
Data allowed  
to change  
STOP  
condition  
1
S Slave Address R/W A Data Byte 1  
Data Byte 2  
A
Data Byte 1  
P
A
Read out of first pressure value  
Read out of n pressure values (optional)  
S = START condition  
A = Acknowledge  
Data Byte 1 = High Byte (MSB first)  
Data Byte 2 = Low Byte (LSB last)  
generated by master  
generated by slave  
P = STOP condition  
Fig. 1: I²C bus protocol  
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