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NE1617A
All information provided in this document is subject to legal disclaimers.
?NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5  20 March 2012
7 of 30
NXP Semiconductors
NE1617A
Temperature monitor for microprocessor systems
[1]   Any pull-up/pull-down resistor used to connect to GND or V
DD
 should be ?2 kW.
8.3  Registers
The device contains more than 9 registers. They are used to store the data of device
set-up and operation results. Depending on the bus communication (either read or write
operations), each register may be called by different names because each register may
have different sub-addresses or commands for read and write operations. For example,
the configuration register is called as WC for write mode and as RC for read mode.
Table 4
 shows the names, commands and functions of all registers as well as the register
POR states.
Remark: Attempting to write to a read-command or read from a write-command will 
produce an invalid result. The reserved registers are used for factory test purposes and
should not be written.
 
n.c.
n.c.
0101 010
n.c.
V
DD
0101 011
V
DD
GND
1001 100
V
DD
n.c.
1001 101
V
DD
V
DD
1001 110
Table 3.
Device slave address &continued
n.c. = not connected
ADD0
[1]
ADD1
[1]
Address byte
Table 4.
Register assignments
Register name
Command byte
POR state
Function
RIT
00h
0000 0000
read internal or local temp byte
RET
01h
0000 0000
read external or remote temp byte
RS
02h
n/a
read status byte
RC
03h
0000 0000
read configuration byte
RCR
04h
0000 0010
read conversion rate byte
RIHL
05h
0111 1111
read internal temp high limit byte
RILL
06h
1100 1001
read internal temp low limit byte
REHL
07h
0111 1111
read external temp high limit byte
RELL
08h
1100 1001
read external temp low limit byte
WC
09h
n/a
write configuration byte
WCR
0Ah
n/a
write conversion rate byte
WIHL
0Bh
n/a
write internal temp high limit byte
WILL
0Ch
n/a
write internal temp low limit byte
WEHL
0Dh
n/a
write external temp high limit byte
WELL
0Eh
n/a
write external temp low limit byte
OSHT
0Fh
n/a
one-shot command
-
10h
n/a
reserved
-
11h
n/a
reserved
-
12h
n/a
reserved
-
13h
n/a
reserved
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