Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

NE1617A Datasheet(PDF) 12 Page - NXP Semiconductors

Part No. NE1617A
Description  Temperature monitor for microprocessor systems
Download  17 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

NE1617A Datasheet(HTML) 12 Page - NXP Semiconductors

Zoom Inzoom in Zoom Outzoom out
 12 / 17 page
background image
Philips Semiconductors
Product data sheet
NE1617A
Temperature monitor for microprocessor systems
2004 Oct 05
12
Status register
The content of the status register reflects condition status resulting
from all of these activities: comparisons between temperature
measurements and temperature limits, the status of ADC
conversion, and the hardware condition of the connection of external
diode to the device. Bit assignments and bit functions of this register
are listed in Table 6. This register can only be read using the
command of register named RS. Upon POR, the status of all flag
bits are reset to zero. The status byte is cleared by any successful
read of the status register unless the fault condition persists.
Notice that any one of the fault-conditions, except the conversion
busy, also introduces an Alert interrupt to the SMBus that will be
described in the following section. Also, whenever a one-shot
command is executed, the status byte should be read after the
conversion is completed, which is about 170 ms after the one-shot
command is sent.
Table 6. Status register bit assignment
BIT
NAME
POR
STATE
FUNCTION
7 (MSB)
BUSY
n/a
High when the ADC is busy
converting
6
IHLF*
0
High when the internal
temperature high limit has tripped
5
ILLF*
0
High when the internal
temperature low limit has tripped
4
EHLF*
0
High when the external
temperature high limit has tripped
3
ELLF*
0
High when the external
temperature low limit has tripped
2
OPEN*
0
High when the external diode is
opened
1 to 0
n/a
0
Reserved
*
These flags stay high until the status register is read or POR is
activated.
Alert interrupt
The ALERT output is used to signal Alert interruption from the
device to the SMBus and is Active-LOW. Because this output is an
open-drain output, a pull-up resistor (10 k
Ω typ.) to VDD is required,
and slave devices can share a common interrupt line on the same
SMBus. An Alert interrupt is asserted by the device whenever any
one of the fault conditions, as described in the Status register
section, occurs: measured temperature equals or exceeds
corresponding temp limits, the remote diode is physically
disconnected from the device pins. Alert interrupt signal is latched
and can only be cleared by reading the Alert Response byte from
the Alert Response Address which is a special slave address to the
SMBus. The ALERT output can not be reset by reading the device
status register. The device was designed to accommodate the Alert
interrupt detection capability of the SMBus.1
Basically, the SMBus provides Alert response interrupt pointers in
order to identify the slave device which has caused the Alert
interrupt. The 7-bit Alert response slave address is 0001 100 and
the Alert response byte reflects the slave address of the device
which has caused Alert interrupt. Bit assignments of the Alert
response byte are listed in Table 7. The ALERT output will be reset
to HIGH state upon reading the Alert response slave address unless
the fault condition persists.
Table 7. Alert response bit assignment
(Alert response address = 0001 100)
ALERT
RESPONSE
BIT
NAME
ADDRESS
BIT
FUNCTION
7 (MSB)
ADD7
Indicate address B6 of alerted device
6
ADD6
Indicate address B5 of alerted device
5
ADD5
Indicate address B4 of alerted device
4
ADD4
Indicate address B3 of alerted device
3
ADD3
Indicate address B2 of alerted device
2
ADD2
Indicate address B1 of alerted device
1
ADD1
Indicate address B0 of alerted device
0 (LSB)
1
Logic 1
1.
The NE1617A implements the collision arbitration function per System Management Bus Specification Revision 1.1 dated December 11, 1998, which conforms to
standard I2C arbitration as described in Philips Semiconductors document #98–8080–575–01.


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn