MCP98242T-CE/MC Microchip Technology, MCP98242T-CE/MC Datasheet - Page 3

• Manufacturer Part Number: MCP98242T-CE/MC
• Description: JEDEC DIMM Serial Output Temp Sensor + SPD EEPROM 8 DFN 2X3mm T/R
• Manufacturer: Microchip Technology

Specifications of MCP98242T-CE/MC

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Full Temp Accuracy: +/- 2 C
• Digital Output - Bus Interface: Serial (2-Wire, I2C)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MCP98242T-CE/MCTR

For temperature conditions other than Table 1, the
device blocks data overwrite. Therefore, this issue will
not occur.
TABLE 1:
The #Event output condition
The data synchronization issue does not affect the
#Event output status. The #Event output logic is not
related to the I
#Event output will not false trigger. This issue is strictly
related to the data transmission process with the host
controller.
© 2009 Microchip Technology Inc.
112.00
111.75
15.75
16.00
31.75
32.00
47.75
48.00
63.75
64.00
79.75
80.00
97.75
96.00
°C
Work around
If the ambient temperature read is within the
host temperature limit, then do nothing.
Otherwise, if the new temperature read is
greater than or less than the previous
temperature data by exactly 16.00°C, then
perform a Repeat Read to receive the correct
temperature data. There is a 0% probability that
the Repeat Read data would be corrupted, if the
Repeat Read is performed within T
(65 ms). If a Repeat Read is performed after
65 ms then there is a greater than 0% probability
that the next conversion would also be corrupt
by ±16.00°C as stated in Table 1. In this case,
disregard this reading and perform a Repeat
Read and compare the result with the last
known good reading.
This workaround is Microchip's recommenda-
tion and it has not been endorsed by Intel or
other OEMs. If necessary, OEMs can contact
Microchip to discuss other firmware solutions.
Previous Temperature
0000 0000 1111 1100
0000 0001 0000 0000
0000 0001 1111 1100
0000 0010 0000 0000
0000 0010 1111 1100
0000 0011 0000 0000
0000 0011 1111 1100
0000 0100 0000 0000
0000 0100 1111 1100
0000 0101 0000 0000
0000 0101 1111 1100
0000 0110 0000 0000
0000 0110 1111 1100
0000 0111 0000 0000
2
C data transmission logic, therefore the
TEMPERATURE BOUNDARY CONDITIONS AND OUTPUT ERROR FOR
TEMPERATURES > 0°C
Binary
112.00
111.75
16.00
15.75
32.00
31.75
48.00
47.75
64.00
63.75
80.00
79.75
96.00
97.75
°C
CONV
Next Temperature
0000 0001 0000 0000
0000 0000 1111 1100
0000 0010 0000 0000
0000 0001 1111 1100
0000 0011 0000 0000
0000 0010 1111 1100
0000 0100 0000 0000
0000 0011 1111 1100
0000 0101 0000 0000
0000 0100 1111 1100
0000 0101 0000 0000
0000 0101 1111 1100
0000 0111 0000 0000
0000 0110 1111 1100
Binary
Part Numbers that fix this issue
Devices on or after date code 0847 correct this issue.
The Device ID/Revision Register for these parts is
set to 0x2000 hex.
Devices on or after date code 0915 have an updated
Device ID/Revision of 0x2001 hex.
These devices have been validated by Microchip
Technology Inc. and Intel Corporation.
• MCP98242T-BE/MNYBA2
• MCP98242T-BE/MNYBAC
• MCP98242T-BE/MCBA2
• MCP98242T-BE/MCBAC
• MCP98242-BE/MCBA2
127.75
111.75
31.75
47.75
32.00
63.75
48.00
79.75
64.00
95.75
80.00
96.00
°C
16
0
MCP98242
0000 0000 0000 0000
0000 0001 1111 1100
0000 0001 0000 0000
0000 0010 1111 1100
0000 0010 0000 0000
0000 0011 1111 1100
0000 0011 0000 0000
0000 0100 1111 1100
0000 0100 0000 0000
0000 0101 1111 1100
0000 0101 0000 0000
0000 0110 1111 1100
0000 0110 0000 0000
0000 0111 1111 1100
Error
Binary
DS80431C-page 3