se98a NXP Semiconductors, se98a Datasheet - Page 14

• Manufacturer Part Number: se98a
• Description: Ddr Memory Module Temp Sensor, 1.7 V To 3.6 V
• Manufacturer: NXP Semiconductors

NXP Semiconductors
SE98A_1
Product data sheet
Fig 11. SMBus/I
SDA
SDA
SCL
SCL
START
by host
S
A = ACK = Acknowledge bit. NA = Not Acknowledge bit. W = Write bit = 0. R = Read bit = 1.
D15
A6
1
1
7.10 Hot plugging
2
D14
A5
C-bus word read from register with a pre-set pointer
2
2
returned most significant byte data
device address and read
The SE98A can be used in hot plugging applications. Internal circuitry prevents damaging
current backflow through the device when it is powered down, but with the I
EVENT or address pins still connected. The open-drain SDA and EVENT pins (SCL and
address pins are input only) effectively places the outputs in a high-impedance state
during power-up and power-down, which prevents driver conflict and bus contention. The
50 ns noise filter will filter out any insertion glitches from the state machine, which is very
robust and not prone to false operation.
The device needs a proper power-up sequence to reset itself, not only for the device
I
into its operational registers. The power-up sequence should occur correctly with a fast
ramp rate and the I
power-up, but it should not damage the part if the power-up sequence is abnormal. If the
SCL line is held LOW, the part will not exit the power-on reset mode since the part is held
in reset until SCL is released.
D13
2
A4
3
3
C-bus and I/O initial states, but also to load specific pre-defined data or calibration data
D12
A3
4
4
D11
A2
5
5
D10
A1
6
6
2
C-bus active. The SE98A might not respond immediately after
D9
A0
7
7
Rev. 01 — 5 March 2009
D8
R
8
8
by device
by host
ACK
ACK
A
9
A
9
(cont.)
(cont.)
D7
1
DDR memory module temp sensor, 1.7 V to 3.6 V
D6
2
returned least significant byte data
D5
3
D4
4
D3
5
D2
6
D1
7
© NXP B.V. 2009. All rights reserved.
D0
8
2
SE98A
by host
NACK
C-bus,
NA
9
002aab414
STOP
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