DLP-245PB-G Просмотр технического описания (PDF) - Unspecified

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DLP-245PB-G

USB / Microcontroller Module (Lead-Free)

Unspecified 

0xAC – DS18S20 Start Convert

Parameters:

Returns:

Function:

Example:

Port Pin – Selects the microcontroller port pin on the 16F877A to be used for

communication with the DS18B20 temperature sensor.

1 Byte: A single byte indicating the result of trying to reset the temperature

sensor.

Sensor status definitions:

99: Sensor ready

8: Short circuit detected

2: No sensor detected

This function will select a port pin for communicating with a DS18B20

temperature sensor and start a temperature conversion. In addition to power and

ground connections, a 1.5K to 4.7K pull-up resistor must be connected between

VCC and the data pin of the DS18B20 for proper communication. The

conversion time for the DS18B20 is specified for a maximum of 750 milliseconds.

0x2, 0xAC, 0x30, 0x9E – Starts a temperature conversion on 16F877A port pin

B0.

0xAD – DS18B20 Read Data

Parameters:

Returns:

Function:

Example:

Port Pin – Selects the microcontroller port pin on the 16F877A to be used for

communication with the DS18B20 temperature sensor.

9 Bytes: The contents of the scratchpad memory in the DS18B20.

This function will select a port pin for communicating with a DS18B20

temperature sensor and request the current contents of the DS18B20’s

scratchpad memory. A conversion (command 0xAC) must have been previously

requested for the data to be current. Additionally, host software must wait at

least 750 milliseconds for the conversion to complete before reading the 9 bytes

of data. In addition to power and ground, a 1.5K to 4.7K pull-up resistor must be

connected between VCC and the data pin of the DS18B20 for proper

communications. (For an example of how to calculate .1°C resolution

temperature data from the 9 bytes of return data, refer to the example Windows

source code.)

0x2, 0xAD, 0x30, 0x9F – Requests 9 byte temperature data from 16F877A port

pin B0.

V2.3

Page 10 of 15

February 2007

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