NE1617DS NXP Semiconductors, NE1617DS Datasheet - Page 12

• Manufacturer Part Number: NE1617DS
• Description: Board Mount Temperature Sensors I2C LOC +/- 2OC AND REM +/- 3OC TS
• Manufacturer: NXP Semiconductors

Specifications of NE1617DS

• Full Temp Accuracy: +/- 3 C, +/- 5 C
• Package / Case: SSOP-16
• Digital Output - Bus Interface: 2-Wire
• Maximum Operating Temperature: + 120 C
• Minimum Operating Temperature: 0 C
• Output Type: Digital
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: NE1617DS,112

*
Philips Semiconductors
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 170ms after the one-shot
command is sent.
Table 6. Status register bit assignment
2004 Oct 06
7 (MSB)
Temperature monitor for microprocessor systems
1 to 0
These flags stay high until the status register is read or POR is
activated.
BIT
6
5
4
3
2
OPEN*
NAME
EHLF*
BUSY
ELLF*
IHLF*
ILLF*
n/a
STATE
POR
n/a
0
0
0
0
0
0
High when the ADC is busy
converting
High when the internal
temperature high limit has tripped
High when the internal
temperature low limit has tripped
High when the external
temperature high limit has tripped
High when the external
temperature low limit has tripped
High when the external diode is
opened
Reserved
FUNCTION
12
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 typ) to V
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.
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
SMBus Alert
SMBus Alert is defined in the SMBus specification 2.0 appendix A .
NE1617A is fully compliant to this specification, but NE1617 is not.
To support this feature, use NE1617A.
RESPONSE
7 (MSB)
ALERT
0 (LSB)
BIT
6
5
4
3
2
1
(Alert response address = 0001 100)
ADDRESS
NAME
ADD7
ADD6
ADD5
ADD4
ADD3
ADD2
ADD1
BIT
1
Indicate address B6 of alerted device
Indicate address B5 of alerted device
Indicate address B4 of alerted device
Indicate address B3 of alerted device
Indicate address B2 of alerted device
Indicate address B1 of alerted device
Indicate address B0 of alerted device
Logic 1
FUNCTION
Product specification
NE1617
DD
is required,