mt9jsf12872az Micron Semiconductor Products, mt9jsf12872az Datasheet - Page 15

• Manufacturer Part Number: mt9jsf12872az
• Description: 1gb, 2gb, 4gb X72, Ecc, Sr 240-pin Ddr3 Sdram Udimm
• Manufacturer: Micron Semiconductor Products

Temperature Sensor with Serial Presence-Detect EEPROM
Serial Presence-Detect EEPROM Operation
Table 15: Temperature Sensor with Serial Presence-Detect EEPROM Operating Conditions
Table 16: Sensor and EEPROM Serial Interface Timing
PDF: 09005aef8360c8e6
jsf9c128_256_512x72az.pdf - Rev. C 9/09 EN
Parameter/Condition
Supply voltage
Supply current: V
Input high voltage: Logic 1; SCL, SDA
Input low voltage: Logic 0; SCL, SDA
Output low voltage: I
Input current
Temperature sensing range
Temperature sensor accuracy (initial release)
Temperature sensor accuracy (class B)
Parameter/Condition
Time bus must be free before a new transition can
start
SDA fall time
SDA rise time
Data hold time
Start condition hold time
Clock HIGH period
Clock LOW period
SCL clock frequency
Data setup time
DD
= 3.3V
OUT
= 2.1mA
The temperature from the integrated thermal sensor is monitored and converts into a
digital word via the I
to create a custom temperature-sensing solution based on system requirements. Pro-
gramming and configuration details comply with JEDEC standard No. 21-C page 4.7-1,
“Definition of the TSE2002av, Serial Presence Detect with Temperature Sensor.”
DDR3 SDRAM modules incorporate serial presence-detect. The SPD data is stored in a
256-byte EEPROM. The first 128 bytes are programmed by Micron to comply with JE-
DEC standard JC-45, “Appendix X: Serial Presence Detect (SPD) for DDR3 SDRAM
Modules.” These bytes identify module-specific timing parameters, configuration infor-
mation, and physical attributes. User-specific information can be written into the
remaining 128 bytes of storage. READ/WRITE operations between the system (master)
and the EEPROM (slave) device occur via an I
Vss, permanently disabling hardware write protect. For further information please refer
to Micron technical note TN-04-42, "Memory Module Serial Presence-Detect."
1GB, 2GB, 4GB (x72, ECC, SR) 240-Pin DDR3 SDRAM UDIMM
Temperature Sensor with Serial Presence-Detect EEPROM
2
C bus. System designers can use the user-programmable registers
t
Symbol
Symbol
t
HD:DAT
SU:DAT
V
t
t
t
H:STA
t
HIGH
LOW
t
DDSPD
V
BUF
I
V
V
SCL
15
I
t
DD
t
–
–
–
IN
OL
R
F
IH
IL
Micron Technology, Inc. reserves the right to change products or specifications without notice.
+1.45
Min
Min
+3.0
–5.0
–2.0
–1.0
2
200
250
–40
4.7
4.0
4.0
4.7
20
10
C bus. Write protect (WP) is connected to
–
–
–
–
V
DDSPD
+0.55
1,000
+125
Max
Max
+3.6
+2.0
+0.4
+5.0
+2.0
+1.0
300
900
100
©2008 Micron Technology, Inc. All rights reserved.
50
–
–
–
–
+ 1
Units
Units
kHz
mA
µA
°C
°C
°C
µs
ns
ns
ns
µs
µs
µs
ns
V
V
V
V