MCP98243-BE/MNY MICROCHIP [Microchip Technology], MCP98243-BE/MNY Datasheet - Page 26

• Manufacturer Part Number: MCP98243-BE/MNY
• Description: Memory Module Temperature Sensor w/ EEPROM for SPD
• Manufacturer: MICROCHIP [Microchip Technology]

MCP98243
5.1.4
The MCP98243 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 MCP98243 performs an analog-to-
REGISTER 5-5:
DS22153B-page 26
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15
bit 14
bit 13
bit 12
bit 11-0
T
A
Note 1: Bits 15, 14 and 13 are not affected by the status of the Event output configuration (bits 5 to 0 of CONFIG)
vs. T
2
R-0
R-0
A
3
register bits (bits 12 thru 0) are double-buffered.
°C
2: Bits 2, 1, and 0 may remain clear '0' depending on the status of the resolution register
CRIT
AMBIENT TEMPERATURE
REGISTER (T
(Register
The Power-up default is 0.25°C/bit, bits 1 and 0 remain clear '0'.
T
T
0 = T
1 = T
T
0
1 =
T
0 =
1 =
SIGN Bit:
0 =
1 =
Ambient Temperature (T
12-bit Ambient Temperature data in two’s complement format.
A
A
A
A
=
vs. T
vs. T
vs. T
vs. T
2
R-0
R-0
2
T
T
T
T
T
T
5-3).
AMBIENT TEMPERATURE REGISTER (T
°C
A
A
A
A
A
A
A
A
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
A
Bit:
Bit:
vs. T
2
R-0
R-0
1
°C
LOWER
A
) Bits: (Note 2)
SIGN
2
R-0
R-0
0
°C
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
digital conversion. The temperature data from the ΔΣ
ADC is loaded in parallel to the T
refresh rate.
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
2
2
R-0
R-0
-1
7
°C
°C
A
A
) → ADDRESS
register bit assignment and boundary
A
is less than T
2
2
A
R-0
R-0
-2
6
register uses three bits (bits 15, 14
°C
°C
A
A
is greater than T
is greater than or equal to T
© 2009 Microchip Technology Inc.
‘0000 0101’b
Register
x = Bit is unknown
LOWER
2
2
R-0
R-0
-3
5
°C
°C
A
.
5-5.
register at t
UPPER
(Register
(NOTE 1)
and bit 13
2
2
R-0
R-0
-4
4
°C
°C
5-8).
CONV
bit 8
bit 0
CRIT
,