MCP98243 Microchip Technology Inc., MCP98243 Datasheet - Page 16

• Manufacturer Part Number: MCP98243
• Description: Memory Module Temperature Sensor W/ Eeprom For Spd
• Manufacturer: Microchip Technology Inc.

MCP98243
5.1
The MCP98243 has several registers that are user-
accessible. These registers include the Capability
register, Configuration register, Event Temperature
Upper-Boundary and Lower-Boundary Trip registers,
Critical
register, Manufacturer Identification register and
Device Identification register.
The Temperature register is read-only, used to access
the ambient temperature data. The data is loaded in
parallel to this register after t
Temperature Upper-Boundary and Lower-Boundary
Trip
temperature drifts beyond the user-specified limits, the
MCP98243 outputs a signal using the Event pin (refer
to Section 5.2.3 “Event Output Configuration”). In
addition, the Critical Temperature Trip register is used
to provide an additional critical temperature limit.
REGISTER 5-1:
DS22153A-page 16
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-4
bit 3-0
W-0
registers
—
Registers
Temperature
Writable Bits: Write ‘0’’
Bits 7-3 must always be cleared or written to ‘0’. This device has additional registers that are reserved
for test and calibration. If these registers are accessed, the device may not perform according to the
specification.
Pointer Bits:
0000 =
0001 =
0010 =
0011 =
0100 =
0101 =
0110 =
0111 =
1000 =
1XXX =
are
W-0
—
REGISTER POINTER (WRITE ONLY)
read/writes.
Trip
Capability register
Configuration register (CONFIG)
Event Temperature Upper-Boundary Trip register (T
Event Temperature Lower-Boundary Trip register (T
Critical Temperature Trip register (T
Temperature register (T
Manufacturer ID register
Device ID/Revision register
Resolution register
Reserved
register,
W = Writable bit
‘1’ = Bit is set
CONV
W-0
—
If
. The Event
the
Temperature
ambient
W-0
A
—
)
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
CRIT
The Capability register is used to provide bits
describing the MCP98243’s capability in measurement
resolution, measurement range and device accuracy.
The device Configuration register provides access to
configure the MCP98243’s various features. These
registers are described in further detail in the following
sections.
The registers are accessed by sending a Register
Pointer to the MCP98243 using the serial interface.
This is an 8-bit write-only pointer. However, the three
Least Significant bits are used as pointers and all
unused bits (bits 7-3) need to be cleared or set to ‘0’.
Register 5-1
each register.
W-0
)
describes the pointer or the address of
W-0
UPPER
LOWER
Pointer Bits
)
)
© 2009 Microchip Technology Inc.
x = Bit is unknown
W-0
W-0
bit 0