MCP9800DM-DL Microchip Technology, MCP9800DM-DL Datasheet - Page 15

• Manufacturer Part Number: MCP9800DM-DL
• Description: BOARD DEMO FOR MCP9800
• Manufacturer: Microchip Technology

Specifications of MCP9800DM-DL

• Sensor Type: Temperature
• Sensing Range: -55°C ~ 125°C
• Interface: I²C, SMBus
• Sensitivity: ±0.5°C
• Voltage - Supply: 2.7 V ~ 5.5 V
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP9800
• Processor To Be Evaluated: MCP9800
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

© 2005 Microchip Technology Inc.
2.4.2
There are several user selectable features, all require changing the code and recom-
piling the firmware. Steps 8, 9 and 10 of 2.3.2 “Programming the PIC16F684” will
then have to be repeated to reprogram the PICmicro microcontroller.
The userVariables.inc file includes all variables.
2.4.2.1
The MCP9800 Temperature Data Logger Demo board can be powered with a lithium
cell and operate as a stand-alone temperature data logger. To enable this feature, set
the stand-alone variable in the userVariable.inc file to “1”, compile the code and
program the PICmicro microcontroller. Set the variable to “0” to disable this feature.
In Stand-Alone mode, momentarily pressing the on-board reset push button switch will
overwrite previously stored data.
In order to retrieve the logged data, refer to Section 2.4.2.4.
2.4.2.2
The minimum number of samples that can be logged are 256 samples. The sample
size can be increased by multiples of 256 up to 4096 samples. The data logger board
can store up 128000 samples, however, currently the software tool does not support
data transfer size greater than 4096 samples.
The minimum measurement duration is 60 ms. The duration can be increased by a
multiple of 60 ms. Table 2-1 shows the user variable description as shown in the user-
Variable.inc file.
TABLE 2-1:
2.4.2.3
The MCP9800 provides an open-drain temperature alert output. When the temperature
rises above the user specified limit, the output toggles and it remains set until the
temperature falls below the user specified hysteresis limit.
To set the limits, open the userVariables.inc file and select a decimal number that
corresponds to the temperature of interest to the defined variables,
MCP9800_Temperature.set and MCP9800_Temperature.hysteresis. For
example, if the temperature limit is 30°C and the hysteresis limit is 27°C, define ‘.30’
and ‘.27’ for the variables, respectively.
Note 1:
Sample.Size
1
2
3
4
5
When downloading the data to the PC, select the corresponding sample size from
the pull down menu provided in the signal analysis software.
User Selectable Features
STAND-ALONE
SETTING NUMBER OF SAMPLES AND SAMPLING TIME
SETTING TEMPERATURE ALERT LIMIT AND HYSTERESIS
Sample Size
USER SELECTABLE VARIABLE DESCRIPTION
1024
2048
4096
Size
256
517
Sampling.Time
6,000
100
10
1
2
Sampling Time
DS51593A-page 11
Time (ms)
360,000
6,000
120
600
60