Counter Pulse
Counter Pulse
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I2C bus digital temperature sensor in the temperature detection - sensors, technology - HC net electrical industry
Opened the door in case of count on the number of low temperature coefficient of oscillator pulse counting, pulse counting period is determined by the temperature coefficient of the oscillator, counter and register the pre-set temperature value of -55 . If the counter reaches 0 before the end of the pulse, the temperature registers an increase, while the counter preset value accumulator for the non-linear, and start counting, if the pulse cycle has not ended before the counter to 0, then repeat the above process, Otherwise, stop counting. The final temperature register with the value of the measured temperature. DS1624 temperature values expressed in units of 0.03125 , 1624, the internal temperature registers 13 bits (2 bytes) of the register, the register can be read out through serial IIC bus, high in the former. The contents of register 13 shall complement that of the temperature, the highest position of sign bit, the sign bit? Quot; 1 "means that the temperature is negative," 0 "indicates the temperature value is positive. The true value of data 13 multiplied by 0.03125, that is, the measured temperature. For example: That the measured temperature: +802 * 0.03125 = 25.0625
DS1624 works DS1624 can work in two modes, continuous conversion mode and a conversion method, through the configuration register to control which mode to use. DONE bit for the conversion is complete, the temperature conversion time for a complete, conversion to 0,1 SHOT is a model for the bit, the bit is 1, the start conversion command for each receive a temperature conversion for 0, the Executive continuous temperature conversion, the bit is nonvolatile. DS1624 in an embedded system, the need to issue control commands to its MCU, such as the status register read and write, reading the temperature register, start temperature conversion command, MCU control of the DS1624 is achieved through the I2C bus interface , the write and read out in full compliance with I2C bus protocol. DS1624's command set Package 5 with the following, the DS1621 series is more than the same convenient and simple. (1) Start temperature conversion [EEH] The start temperature conversion command, without reading the data, then a conversion mode, the command to start conversion, DS1624 remains idle after the completion of conversion, in continuous conversion mode, the command starts DS1624 continuous temperature conversion. (2) the end of the temperature conversion command [22H]
This command stops temperature conversion, without more data, in continuous operation mode, the command to stop DS1624 temperature conversion, and remains idle until the DS1624 temperature conversion start by the new command. (3) read temperature command [AAH] The command to read out the result of recent temperature change, followed by two bytes DS1624 will complement that of the temperature sent. Up to the sign bit, a minimum of three no. (4) access to the configuration register [ACH]
If the R / W = 0, the command after the configuration register is written, MCU sends a byte, to determine DS1624 work; if the R / W = 1, DS6124 used to inform the MCU sends the current state conversion is complete. (5) Access Memory [17H] The command used to access the DS1624 integrated 256B of the E2 internal memory, the next byte of data to be accessed memory address, and for E2 memory read and write operations, read and write and other I2C E2 memory the same agreement. Readers may refer to other information. DS1624 start temperature conversion, visit the configuration register, read the flow chart shown in Figure 2, the temperature value.
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synchronising counter and transmitter ?
i have to transmit ultrasonic waves at 40khz at the start of pulse, the counter also has to start... how to synchronize these two and the counter has to stop when an echo signal is received
You are trying to build some sort of echo location device, such as a depth sounder?
I don't know.
Or maybe an ultrasonic distance measurement device.
You can buy one, you know. Pretty cheap.
