mt18hvs25672rhy-667 Micron Semiconductor Products, mt18hvs25672rhy-667 Datasheet - Page 11

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

Temperature Sensor
Table 12:
Table 13:
EVENT# Pin
PDF: 09005aef82882ad5/Source: 09005aef82882b0e
HVS18C_256x72RH.fm - Rev. B 5/08 EN
Parameter/Condition
Parameter/Condition
Supply voltage
Average operating supply current
Input high voltage: Logic 1; All inputs
Input low voltage: Logic 0; All inputs
Output low voltage: I
Logic input current
Temperature sensing range
Time bus must be free before a new transition can
start
SDA and SCL fall time
Data hold time
Start condition hold time
Clock HIGH period
Clock LOW period
SDA and SCL rise time
SCL clock frequency
Data setup time
Start condition setup time
Stop condition setup time
Clock frequency
Temperature Sensor Specifications
All voltages referenced to V
Temperature Sensor EEPROM AC Timing
OUT
= 3mA
The temperature sensor continuously monitors the module’s temperature and can be
read back at any time over the I
the JEDEC standard JESD21-C, page 4.7-1.
The temperature sensor also adds the EVENT# pin. Not used by the SPD, the EVENT# is a
temperature sensor output used to flag critical events that can be set up in the sensor’s
configuration register.
EVENT# has three defined modes of operation: interrupt mode, compare mode, and
critical temperature mode. The open-drain output of EVENT# under the three separate
operating modes is illustrated in Figure 3 on page 12. Event thresholds are programmed
in the 0x01 register using a hysteresis. The alarm window provides a comparison
window, with upper and lower limits set in the alarm upper boundary register and the
alarm lower boundary register, respectively. When the alarm window is enabled,
EVENT# will trigger whenever the temperature is outside the MIN or MAX values set by
the user.
SS
2GB (x72, DR) 200-Pin DDR2 SDRAM VLP SORDIMM
11
Symbol
t
t
t
t
t
HD:DAT
2
HD:STA
SU:DAT
SU:STO
SU:STA
t
t
C bus shared with the SPD. This sensor complies with
t
HIGH
LOW
f
f
BUF
SCL
t
CK
t
R
F
Symbol
V
Micron Technology, Inc., reserves the right to change products or specifications without notice.
DDSPD
V
V
V
I
I
IH
OL
IL
IH
IL
Min
300
250
4.7
4.0
4.7
4.7
10
4
4
Min
+3.0
+2.1
–40
–5
–5
–
–
–
Temperature Sensor
©2007 Micron Technology, Inc. All rights reserved.
Max
300
400
100
50
1
Max
+500
+125
+3.6
+0.8
+0.4
+5
+5
–
Units
kHz
kHz
Units
µs
ns
ns
µs
µs
µs
ns
ns
µs
µs
µA
µA
µA
°C
V
V
V
V