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NE1617A Datasheet(PDF) 10 Page - NXP Semiconductors

Part No. NE1617A
Description  Temperature monitor for microprocessor systems
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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NE1617A Datasheet(HTML) 10 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
NE1617A
Temperature monitor for microprocessor systems
2004 Oct 05
10
TEMPERATURE MONITOR WITH SMB SERIAL
INTERFACE
Serial bus interface
The device can be connected to a standard 2-wire serial interface
System Management Bus (SMBus) as a slave device under the
control of a master device, using two device terminals SCLK and
SDATA. The operation of the device to the bus is described with
details in the following sections.
Slave address
The device address is defined by the logical connections applied to
the device pins ADD0 and ADD1. A list of selectable addresses are
shown in Table 1. The device address can be set to any one of
those nine combinations and more than one device can reside on
the same bus without address conflict. Note that the state of the
device address pins is sampled and latched not only at power-up
step but also at starting point of every conversion.
Table 1. Device slave address
ADD0*
ADD1*
ADDRESS BYTE
GND
GND
0011 000
GND
NC
0011 001
GND
VDD
0011 010
NC
GND
0101 001
NC
NC
0101 010
NC
VDD
0101 011
VDD
GND
1001 100
VDD
NC
1001 101
VDD
VDD
1001 110
NC = Not Connected.
*
Any pull-up/down resistor used to connect to GND or VDD should
be
≤ 2 kΩ.
Registers
The device contains more than 9 registers. They are used to store
the data of device setup 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 2 (Register Assignments)
shows the names, commands and functions of all registers as well
as the register POR states.
Note that 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 to.
Low power standby modes
Upon POR, the device is reset to its normal free-running
auto-conversion operation mode. The device can be put into
standby mode by either using hardware control (connect the STBY
pin to LOW for hardware standby mode) or using software control
(set bit 6 of the configuration register to HIGH for software standby
mode). When the device is put in either one of the standby modes,
the supply current is reduced to less than 10
µA if there is no
SMBus activity, all data in the device registers are retained and the
SMBus interface is still alive to bus communication. However, there
is a difference in the device ADC conversion operation between
hardware standby and software standby modes. In hardware
standby mode, the device conversion is inhibited and the one-shot
command does not initiate a conversion. In software standby mode,
the one-shot command will initiate a conversion for both internal and
external channels.
If a hardware standby command is received when the device is in
normal mode and a conversion is in progress, the conversion cycle
will stop and data in reading temperature registers will not be
updated.
Table 2. 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
RESERVED
10h
n/a
Reserved
RESERVED
11h
n/a
Reserved
RESERVED
12h
n/a
Reserved
RESERVED
13h
n/a
Reserved


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