SA56004X
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?NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 7 25 February 2013
6 of 43
NXP Semiconductors
SA56004X
Digital temperature sensor with overtemperature alarms
7. Functional description
Refer to Figure 1
Block diagram
.
7.1 Serial bus interface
The SA56004X should be connected to a compatible two-wire serial interface System
Management Bus (SMBus) as a slave device using the two device terminals SCLK and
SDATA. The ALERT
pin can optionally be used with the SMBus protocol to implement the
ARA response. The controller provides a clock signal to the device SCLK pin and
write/read data to/from the device through the device SDATA pin. External pull-up
resistors, about 10 kW each, are needed for these device pins due to open-drain circuitry.
Data of 8-bit digital byte or word are used for communication between the controller and
the device using SMBus 2.0 protocols which are described more in Section 7.10
SMBus
interface
. The operation of the device to the bus is described with details in the following
sections.
7.2 Slave address
The SA56004X has a 7-bit slave address register which is factory programmed in OTP
memory. Eight unique devices are available with different slave addresses as defined in
Table 4
. Up to eight devices can reside on the same SMBus without conflict, if their
addresses are unique.
[1] The device slave address is factory programmed in OTP device address register.
[2] The SA56004ED/EDP/ETK has the bus address of the National LM86, MAX6657/8 and the ADM1032.
Table 4.
Slave addresses
Type number
Device slave address
[1]
SA56004AD
1001 000
SA56004ADP
SA56004ATK
SA56004BD
1001 001
SA56004BDP
SA56004CD
1001 010
SA56004CDP
SA56004DD
1001 011
SA56004DDP
SA56004ED
[2]
1001 100
SA56004EDP
[2]
SA56004ETK
[2]
SA56004FD
1001 101
SA56004FDP
SA56004GD
1001 110
SA56004GDP
SA56004HD
1001 111
SA56004HDP
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