Temperature Sensor with Serial Presence-Detect EEPROM
The temperature sensor continuously monitors the module’s temperature and can be
read back at any time over the SMBus bus shared with the SPD EEPROM and memory
buffer.
Serial Presence-Detect
For the latest SPD data, refer to Micron's SPD page: www.micron.com/SPD.
Table 13: Temperature Sensor with SPD EEPROM Operating Conditions
Parameter/Condition Symbol Min Max Units
Supply voltage V
DDSPD
3.0 3.6 V
Supply current: V
DD
= 3.3V I
DD
– 2.0 mA
Input high voltage: Logic 1; SCL, SDA V
IH
V
DDSPD
x 0.7 V
DDSPD
+ 1 V
Input low voltage: Logic 0; SCL, SDA V
IL
–0.5 V
DDSPD
x 0.3 V
Output low voltage: I
OUT
= 2.1mA V
OL
– 0.4 V
Input current I
IN
–5.0 5.0 µA
Temperature sensing range – –40 125 °C
Temperature sensor accuracy (class B) – –1.0 1.0 °C
Table 14: Temperature Sensor and SPD EEPROM Serial Interface Timing
Parameter/Condition Symbol Min Max Units
Time bus must be free before a new transition can
start
t
BUF 4.7 – µs
SDA fall time
t
F 20 300 ns
SDA rise time
t
R – 1000 ns
Data hold time
t
HD:DAT 200 900 ns
Start condition hold time
t
H:STA 4.0 – µs
Clock HIGH period
t
HIGH 4.0 50 µs
Clock LOW period
t
LOW 4.7 – µs
SCL clock frequency
t
SCL 10 100 kHz
Data setup time
t
SU:DAT 250 – ns
Start condition setup time
t
SU:STA 4.7 – µs
Stop condition setup time
t
SU:STO 4.0 – µs
EVENT# Pin
The temperature sensor also adds the EVENT# pin (open-drain). Although not used by
the SPD EEPROM, 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 below. Event thresholds are programmed in the 0x01 reg-
16GB (x72, ECC, QR x8) 240-Pin DDR3L LRDIMM
Temperature Sensor with Serial Presence-Detect EEPROM
PDF: 09005aef846600e0
kszf36c2gx72ldz.pdf - Rev. F 9/15 EN
18
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© 2011 Micron Technology, Inc. All rights reserved.
