TMPSNS-RTD1 Microchip Technology, TMPSNS-RTD1 Datasheet - Page 30

• Manufacturer Part Number: TMPSNS-RTD1
• Description: BOARD EVAL PT100 RTD TEMP SENSOR
• Manufacturer: Microchip Technology

Specifications of TMPSNS-RTD1

• Sensor Type: Temperature
• Interface: USB
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP3301, MCP6S26, PIC18F2550
• Processor To Be Evaluated: MCP6S26, MCP3301, MCP6024, MCP41010, PIC18F2550, TC1071, MCP6002
• Data Bus Width: 12 bit
• Interface Type: USB
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Voltage - Supply: -
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / Not applicable

PIC18F2455/2550/4455/4550
2.2.5.2
The internal oscillator’s output has been calibrated at
the factory but can be adjusted in the user’s applica-
tion. This is done by writing to the OSCTUNE register
(Register 2-1). The tuning sensitivity is constant
throughout the tuning range.
The INTOSC clock will stabilize within 1 ms. Code exe-
cution continues during this shift. There is no indication
that the shift has occurred.
The OSCTUNE register also contains the INTSRC bit.
The INTSRC bit allows users to select which internal
oscillator provides the clock source when the 31 kHz
frequency option is selected. This is covered in greater
detail in Section 2.4.1 “Oscillator Control Register”.
REGISTER 2-1:
DS39632E-page 28
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6-5
bit 4-0
INTSRC
R/W-0
OSCTUNE Register
INTSRC: Internal Oscillator Low-Frequency Source Select bit
1 = 31.25 kHz device clock derived from 8 MHz INTOSC source (divide-by-256 enabled)
0 = 31 kHz device clock derived directly from INTRC internal oscillator
Unimplemented: Read as ‘0’
TUN4:TUN0: Frequency Tuning bits
01111 = Maximum frequency
•
•
00001
00000 = Center frequency. Oscillator module is running at the calibrated frequency.
11111
•
•
10000 = Minimum frequency
U-0
—
OSCTUNE: OSCILLATOR TUNING REGISTER
W = Writable bit
‘1’ = Bit is set
•
•
•
•
U-0
—
R/W-0
TUN4
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
TUN3
2.2.5.3
The internal oscillator block is calibrated at the factory
to produce an INTOSC output frequency of 8.0 MHz.
However, this frequency may drift as V
ture changes, which can affect the controller operation
in a variety of ways.
The low-frequency INTRC oscillator operates indepen-
dently of the INTOSC source. Any changes in INTOSC
across voltage and temperature are not necessarily
reflected by changes in INTRC and vice versa.
Internal Oscillator Output Frequency
and Drift
R/W-0
TUN2
© 2009 Microchip Technology Inc.
x = Bit is unknown
R/W-0
TUN1
DD
or tempera-
R/W-0
TUN0
bit 0