MCP98242T-CE/ST Microchip Technology, MCP98242T-CE/ST Datasheet - Page 20

• Manufacturer Part Number: MCP98242T-CE/ST
• Description: Board Mount Temperature Sensors JEDEC DIMM SER Outpt Temp Snsr SPD EEPROM
• Manufacturer: Microchip Technology

Specifications of MCP98242T-CE/ST

• Full Temp Accuracy: +/- 2 C
• Package / Case: TSSOP-8
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP98242
5.1.4
The MCP98242 uses a band gap temperature sensor
circuit to output analog voltage proportional to absolute
temperature. An internal ΔΣ ADC is used to convert the
analog voltage to a digital word. The converter
resolution is set to 0.25 °C + sign (11-bit data). The
digital word is loaded to a 16-bit read-only Ambient
Temperature register
temperature data in two’s complement format.
The T
Therefore, the user can access the register while, in the
background, the MCP98242 performs an analog-to-
digital conversion. The temperature data from the ΔΣ
ADC is loaded in parallel to the T
refresh rate.
The T
conversion is shown in
REGISTER 5-5:
DS21996B-page 20
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15
bit 14
bit 13
bit 12
bit 11-2
bit 1-0
Note 1:
T
A
vs. T
2
R-0
R-0
A
A
3
register bits (bits 12 thru 0) are double-buffered.
°C
magnitude in decimal to ambient temperature
CRIT
Not affected by the status of the Event output configuration (bits 5 to 0 of CONFIG) and T
Register 5-3.
AMBIENT TEMPERATURE
REGISTER (T
T
T
0
1
T
0
1
T
0
1
SIGN Bit:
0
1
Ambient Temperature (T
10-bit Ambient Temperature data in two’s complement format.
T
these bits may display 2
A
A
A
A
A
=
=
=
=
=
=
= T
= T
: Data in 2’s complement format. Depending on the status of the Resolution Register (Register 5-8),
vs. T
vs. T
vs. T
vs. T
2
R-0
R-0
2
T
T
T
T
T
T
AMBIENT TEMPERATURE REGISTER (T
°C
A
A
A
A
A
A
A
A
Equation
UPPER
CRIT
UPPER
LOWER
< T
≥ T
≤ T
> T
≥ T
< T
≥ 0°C
< 0°C
(T
A
A
CRIT
CRIT
UPPER
UPPER
LOWER
LOWER
)
(1)
)
(1)
(1)
W = Writable bit
‘1’ = Bit is set
Bit:
T
that contains 11-bit
5-1:
A
Bit:
Bit:
vs. T
A
2
register at t
R-0
R-0
1
°C
-3
LOWER
°C (0.125°C) and 2
A
) Bits:
CONV
SIGN
2
R-0
R-0
0
°C
-4
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
°C (0.0625°C), respectively.
EQUATION 5-1:
In addition, the T
and 13) to reflect the Event pin state. This allows the
user to identify the cause of the Event output trigger
(see Section 5.2.3 “Event Output Configuration”);
bit 15 is set to ‘1’ if T
bit 14 is set to ‘1’ if T
is set to ‘1’ if T
The T
conditions are described in Register 5-5.
Where:
2
2
R-0
R-0
-1
7
Code = MCP98242 temperature output
°C
°C
T
A
A
A
) → ADDRESS ‘0000 0101’b
= Ambient Temperature (°C)
register bit assignment and boundary
magnitude in decimal (bits 0-11)
A
is less than T
2
2
A
R-0
R-0
-2
6
T
register uses three bits (bits 15, 14
°C
°C
A
A
A
is greater than T
is greater than or equal to T
DECIMAL CODE TO
TEMPERATURE
CONVERSION
=
© 2008 Microchip Technology Inc.
Code 2
x = Bit is unknown
LOWER
×
2
R-0
R-0
5
—
4 –
°C
.
HYST
UPPER
= 0°C,
and bit 13
2
R-0
R-0
4
—
°C
bit 8
bit 0
CRIT
,