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NE1618 Datasheet(PDF) 8 Page - NXP Semiconductors

Part No. NE1618
Description  Temperature monitor for microprocessor systems
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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NE1618 Datasheet(HTML) 8 Page - NXP Semiconductors

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Philips Semiconductors
Product data
NE1618
Temperature monitor for microprocessor systems
2002 Jan 04
8
Table 2. Register assignments
REGISTER NAME
COMMAND BYTE
POR STATE
FUNCTION
RDID
FEH
N/A
Read device ID
RDRV
FFH
N/A
Read device revision
RIT
00H
0000 0000
Read internal or local temp
RET
01H
0000 0000
Read external or remote temp
REET
10H
0000 0000
Read extended external temp
RS
02H
N/A
Read status
RC
03H
0000 0000
Read configuration
RCR
04H
0000 0010
Read conversion rate
RIHL
05H
0111 1111
Read internal temp HIGH limit
RILL
06H
1100 1001
Read internal tem low limit
REHL
07H
0111 1111
Read external temp HIGH limit
RELL
08H
1100 1001
Read external temp LOW limit
WC
09H
N/A
Write configuration
WCR
0AH
N/A
Write conversion rate
WIHL
0BH
N/A
Write internal temp HIGH limit
WILL
0Ch
N/A
Write internal temp LOW limit
WEHL
0Dh
N/A
Write external temp HIGH limit
WELL
0Eh
N/A
Write external temp LOW limit
OSHT
0Fh
N/A
One shot command
RESERVED
11H
N/A
Reserved
RESERVED
12H
N/A
Reserved
RESERVED
13H
N/A
Reserved
RESERVED
14H
N/A
Reserved
RESERVED
15H
N/A
Reserved
Power-on reset (POR)
When the power is applied to the NE1618 while the device STDBY
input pin is at low state, the device will enter into its power–on reset
state and its registers are reset to their default values as shown in
the Table 2 resulting in:
Interrupt latch is cleared, the ALERT output driver is off and the
ALERT pin is pulled to HIGH by an external pull-up resister.
The conversion rate is set to the default value of about 0.2 Hz
Temp limits for both channels are +127 °C for high limit and
–55
°C for low limit.
Register pointer is set to 00 for ready to reading the RIT data.
Notice that the content of the register that has indeterminate default
value will be unknown.
During the POR state of the device, the on-board A-to-D converter is
disabled and the measurement function of the device is inactive.
However, the SMBus interface is alive to bus communication
meaning that reading and writing the registers can be performed. If
there is no SMBus activity then the device will draw a small power
supply current less than 10
µA. Writing temp limits into the limits
registers if needed should usually be performed at this stage.
Starting conversion
Upon POR, if the STDBY input pin is set to HIGH while the
RUN/STOP bit 6 of the configuration register is equal to zero as
default, then the device will enter into its free-running operation
mode in which the device A-to-D converter is enabled and the
measurement function is activated. In this mode, the device cycles
the measurements of local temp and remote temp automatically and
periodically. The conversion period is defined by the programmable
conversion rate stored in the conversion register. It also performs
comparisons between readings and limits of the temperature in
order to set the flags and interruption accordingly at the end of every
conversion. Measured values are stored in the temp registers,
results of limit comparisons are reflected by the status of the flag
bits in the status register and interruption is reflected by the logical
level of the ALERT output pin. Temp and status data can be read at
any time. Temp limit values should be written into the limit registers
before starting conversion to avoid false conditions of the status.
Low power standby modes
The device can be put into one of the two standby modes from the
free-running state at any time: hardware standby mode by setting
the STDBY input pin to LOW, or software standby mode by setting
the RUN/STOP bit 6 of the configuration register to 1. In either
standby mode, the free-running operation is stopped, the supply
current is reduced to less than 10
µa if there is no SMBus activity, all
data in the device registers are retained. However, the SMBus is still
active and reading or writing registers can still be performed. The
main difference between the two standby modes is related to the
activation of the A-to-D conversion: data conversion can be
activated in the software standby mode but not in the hardware
standby mode. In software standby mode, an one-shot command
will initiate a single conversion which has the same effect in
comparing with any conversion that occurs when the device is in its


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