DLP-IO20 DLP Design Inc, DLP-IO20 Datasheet - Page 11

• Manufacturer Part Number: DLP-IO20
• Description: MODULE DATA-ACQUISITION 20-CH
• Manufacturer: DLP Design Inc
• Type: Motor / Motion Controllers & Driversr

Specifications of DLP-IO20

• Module/board Type: Data Acquisition, 20-Channel
• Input Voltage: 0 V to 5 V
• Output Voltage: 5 V
• Board Size: 91.5 mm x 48.3 mm x 23 mm
• Interface Type: USB
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Product: Power Management Modules
• Dimensions: 91.5 mm x 48.3 mm x 23 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: USB
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 813-1027; DLP-IO20-G

9.0 Connecting the Digital Temperature Sensor
Up to 17 DS18B20+ digital temperature sensors can be connected to the DLP-IO20. For best
performance, use Category 5/6 type computer cable to connect the sensors to the DLP-IO20. Two
twisted pair wires in the Cat5/Cat6 cable are required for the connection. The first pair is for Power
(5V) and Ground, and the second pair is designated as Data and Ground. In addition, a 1.5K Ohm
pull-up resistor is required for the data line. Figure 3 shows an example of this connection using
Channel AN7.
To detect a sensor, send the DLP-IO20 the Detect Sensor command (0x39) packet for the appropriate
channel. Eight bytes will be returned from this command packet. If the channel is stuck low a 1 will be
returned in the first byte. If no sensor is present a 2 will be returned in the first byte. In these two
cases, the remaining 7 bytes will be all zeroes. If a sensor is present and functional, its 8 byte serial
number will be returned. Next, send a Convert Sensor command (0x40) to initiate a temperature
conversion process. At this point, a Read Sensor command (0x41) packet can be issued to obtain the
temperature value. The conversion can take up to 750mS to complete, depending on the resolution
setting.
All commands are detailed in table 2 under section 8 of this datasheet.
Rev. 1.0 (January 2009)
DLP-IO20
Figure 3: Digital Temperature Sensor Connection Example
+5V
GND
AN7
11
Pin 1
DS18B20+
© DLP Design, Inc.
2. DATA
3. VCC
1. GND