mt18hvs25672rhy-667 Micron Semiconductor Products, mt18hvs25672rhy-667 Datasheet - Page 15

• Manufacturer Part Number: mt18hvs25672rhy-667
• Description: 2gb X72, Dr 200-pin Ddr2 Sdram Vlp Sordimm
• Manufacturer: Micron Semiconductor Products

Table 20:
Figure 4:
Table 21:
PDF: 09005aef82882ad5/Source: 09005aef82882b0e
HVS18C_256x72RH.fm - Rev. B 5/08 EN
10:9
Bit
7
8
Condition
Description
Critical trip lock bit
0: Critical trip is not locked and can be changed
1: Critical trip is locked and can not be changed
Shutdown mode
0: Enabled
1: Shutdown
Hysteresis enable
00 - Disable
01 - Enable at 1.5°C
10 - Enable at 3°C
11 - Enable at 6°C
Clears
Above window bit
Sets
Below window bit
Configuration Register Bit Descriptions (continued)
Hysteresis
Hysteresis
Notes:
Temperature gradient
T
T
1. T
2. T
3. Hyst = Value set in the hysteresis bits of the configuration register.
H
L
1
2
H
L
Falling
Rising
= Value set in the alarm temperature lower boundary trip register.
= Value set in the alarm temperature upper boundary trip register.
Below Alarm Window Bit
Critical temperature
2GB (x72, DR) 200-Pin DDR2 SDRAM VLP SORDIMM
T
L
- Hyst
15
T
L
Note
The shutdown mode is a power saving mode that
disables the temperature sensor
When enabled, a hysteresis is applied to temperature
movement around the trip points. As an example, if
the hysteresis register is enabled to a delta of 6°C the
preset trip points will toggle once the temperature
reaches the programmed value. These values will reset
once the temperature drops below the trip points
minus the set hysteresis level. In this case this would be
critical temperature minus 6°C
The hysteresis is applied to both the above alarm
window and the below alarm window bits found in the
read-only temperature register. EVENT# is also affected
by this register
Micron Technology, Inc., reserves the right to change products or specifications without notice.
Temperature gradient
Falling
Rising
Above Alarm Window Bit
T
1
H
-
Hyst
3
Temperature Sensor
©2007 Micron Technology, Inc. All rights reserved.
Critical temperature
1T
L
2
-
Hyst
T
H
T
- Hyst
H
3