SE98TK-T NXP Semiconductors, SE98TK-T Datasheet - Page 12

• Manufacturer Part Number: SE98TK-T
• Description: Board Mount Temperature Sensors I2C LOCAL +/- 2OC TS DIMM
• Manufacturer: NXP Semiconductors

Specifications of SE98TK-T

• Temperature Threshold: + 6 C
• Full Temp Accuracy: +/- 4 C
• Package / Case: SOT-908
• Digital Output - Bus Interface: 2-Wire, I2C
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 20 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: SE98TK,118

NXP Semiconductors
SE98_4
Product data sheet
Fig 7.
SDA
SCL
START
S
A = ACK = Acknowledge bit. W = Write bit = 0. R = Read bit = 1.
SMBus/I
A6
1
7.9 SMBus/I
2
A5
C-bus write to the Pointer register
2
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 ‘00’, the location for the Capability register. The Pointer register
latches the last location it was set to. 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 the timing diagrams in
Figure
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.
A3
4
8,
Figure 9
2
A2
5
C-bus interface
A1
6
and
A0
7
Rev. 04 — 2 February 2009
Figure 10
W
8
by device
ACK
9
A
on how to program the device.
D7
1
D6
2
DDR memory module temp sensor, 3.3 V
D5
3
register address
D4
4
D3
5
D2
6
D1
7
© NXP B.V. 2009. All rights reserved.
D0
8
by device
Figure
ACK
A
9
SE98
002aab308
STOP
7,
12 of 39
P