SE97TP,147 NXP Semiconductors, SE97TP,147 Datasheet - Page 14

• Manufacturer Part Number: SE97TP,147
• Description: IC TEMP SENSOR DIMM 8-HWSON
• Manufacturer: NXP Semiconductors

Specifications of SE97TP,147

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Comparator, 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-WSON (Exposed Pad), 8-HWSON
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-4730-2; 935286725147

NXP Semiconductors
SE97_7
Product data sheet
Fig 9.
Fig 10. SMBus/I
SDA
SCL
START
S
How SE97 responds to SMBus ALERT Response Address
A = ACK = Acknowledge bit. W = Write bit = 0. R = Read bit = 1.
SMBus ALERT
host detects
A6
1
7.9 SMBus/I
2
A5
C-bus write to the Pointer register
2
START bit
device address and write
The data registers in this device are selected by the Pointer register. At power-up, the
Pointer register is set to ‘00h’, the location for the Capability register. The Pointer register
latches the last location to which it was set. Each data register falls into one of three types
of user accessibility:
A ‘write’ to this device will always include the address byte and the pointer byte. A write to
any register other than the Pointer register requires two data bytes.
Reading this device can take place either of two ways:
The data byte has the most significant bit first. At the end of a read, this device can accept
either Acknowledge (ACK) or No Acknowledge (NACK) from the Master (No Acknowledge
is typically used as a signal for the slave that the Master has read its last byte). It takes
this device 125 ms to measure the temperature. Refer to timing diagrams
Figure 13
S
A4
3
•
•
•
•
•
Read only
Write only
Write/Read same address
If the location latched in the Pointer register is correct (most of the time it is expected
that the Pointer register will point to one of the Temperature register (as it will be the
data most frequently read), then the read can simply consist of an address byte,
followed by retrieving the two data bytes.
If the Pointer register needs to be set, then an address byte, pointer byte,
repeat START, and another address byte will accomplish a read.
0
A3
4
0
master sends a START bit,
ARA and a read command
Alert Response Address
for how to program the device.
2
A2
5
C-bus interface
0
1
A1
6
1
A0
7
Rev. 07 — 29 January 2010
0
DDR memory module temp sensor with integrated SPD, 3.3 V
W
8
0
read
by device
ACK
1
A
9
acknowledge
0
D7
1
0
The last bit of slave address
D6
2
Slave acknowledges and
sends its slave address.
0
is hard coded '0'.
D5
1
3
device address
register address
1
D4
4
A2
D3
5
A1
no acknowledge
A0
D2
6
0
sends a STOP bit
host NACK and
D1
7
1
© NXP B.V. 2010. All rights reserved.
002aac685
D0
8
STOP bit
P
Figure 10
by device
ACK
A
9
SE97
002aab308
STOP
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