se98a NXP Semiconductors, se98a Datasheet - Page 26

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

NXP Semiconductors
9. Application design-in information
SE98A_1
Product data sheet
Fig 14. SE98A interfacing with 1.1 V host controller
0.1 F
A2
A0
A1
In a typical application, the SE98A behaves as a slave device and interfaces to the master
(or host) via the SCL and SDA lines. The host monitors the EVENT output pin, which is
asserted when the temperature reading exceeds the programmed values in the alarm
registers. The A0, A1 and A2 pins are directly connected to the shared SPD’s A0, A1 and
A2 pins, otherwise they must be pulled HIGH or LOW. The SDA and SCL serial interface
pins are open-drain and require pull-up resistors, and are able to sink a maximum current
of 3 mA with a voltage drop less than 0.4 V. Typical pull-up values for SCL and SDA are
10 k , but the resistor values can be changed in order to meet the rise time requirement if
the capacitance load is too large due to routing, connectors, or multiple components
sharing the same bus.
SE98A
Fig 13. Typical application
V
V
DD
SS
EVENT
3.3 V
V
SPD
V
SDA
SCL
DD
SS
10 k
A0
A1
A2
10 k
SDA
SCL
Rev. 01 — 5 March 2009
mother board
0.1 F
slave
B2
B1
A1
A2
A0
V
CC(B)
PCA9509
DDR memory module temp sensor, 1.7 V to 3.6 V
SE98A
V
V
DD
SS
V
CC(A)
EN
A2
A1
10 k
EVENT
SCL
SDA
10 k
10 k
(3 )
EVENT
SDA
SCL
0.1 F
CONTROLLER
1.1 V
master
CONTROLLER
HOST
© NXP B.V. 2009. All rights reserved.
HOST
002aad759
SE98A
002aad900
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