MCP98242_09 Datasheet, PDF (16/52 Pages) Microchip Technology – Memory Module Temperature Sensor w/EEPROM for SPD

MCP98242
5.1.1 CAPABILITY REGISTER
This is a read-only register used to identify the
temperature sensor capability. In this case, the
MCP98242 is capable of providing temperature at
0.25°C resolution, measuring temperature below and
above 0°C, providing ±1°C and ±2°C accuracy over the
active and monitor temperature ranges (respectively)
and providing user-programmable temperature event
boundary trip limits. Register 5-2 describes the
Capability register. These functions are described in
further detail in the following sections.
REGISTER 5-2: CAPABILITY REGISTER (READ-ONLY) → ADDRESS ‘0000 0000’b
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
bit 15
U-0
—
bit 8
U-0
—
bit 7
U-0
U-0
R-0
R-1
R-1
R-1
R-1
—
—
Resolution
Meas Range Accuracy Temp Alarm
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-5
Unimplemented: Read as ‘0’
bit 4-3
bit 2
bit 1
bit 0
Resolution:
00 = 0.5°C
01 = 0.25°C (power up default)
10 = 0.125°C
11 = 0.0625°C
These bits reflect the selected resolution (see Section 5.2.3.3 “Temperature Resolution”)
Temperature Measurement Range (Meas. Range):
0 = T_A = 0 (decimal) for temperature below 0°C
1 = The part can measure temperature below 0°C (power up default)
Accuracy:
0 = Accuracy → ±2°C from +75°C to +95°C (Active Range) and ±3°C from +40°C to +125°C
(Monitor Range)
1 = Accuracy → ±1°C from +75°C to +95°C (Active Range) and ±2°C from +40°C to +125°C
(Monitor Range)
Temperature Alarm:
0 = No defined function (This bit will never be cleared or set to ‘0’).
1 = The part has temperature boundary trip limits (T_UPPER/T_LOWER/T_CRIT registers) and a
temperautre event output (JC 42.4 required feature).
DS21996C-page 16
© 2009 Microchip Technology Inc.