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NE1617ADS Scheda tecnica(PDF) 11 Page - NXP Semiconductors |
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NE1617ADS Scheda tecnica(HTML) 11 Page - NXP Semiconductors |
11 / 27 page NE1617A_4 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 04 — 30 July 2009 11 of 27 NXP Semiconductors NE1617A Temperature monitor for microprocessor systems the Alert Response byte from the Alert Response Address, which is a special slave address to the SMBus. The ALERT output cannot 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 9. The ALERT output will be reset to HIGH state upon reading the Alert response slave address unless the fault condition persists. 8.4 Power-up default condition Upon power-up reset (power is switched off-on), the NE1617A goes into this default condition: • Interrupt latch is cleared, the ALERT output is pulled HIGH by the external pull-up resistor. • The auto-conversion rate is at 0.25 Hz; conversion rate data is 02h. • Temperature limits for both channels are +127 °C for high limit, and −55 °C for low limit. • Command pointer register is set to ‘00’ for quickly reading the RIT. 8.5 Fault detection The NE1617A has a fault detector to the diode connection. The connection is checked when a conversion is initiated and the proper flags are set if the fault condition has occurred. 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-bus arbitration as described in NXP document UM10204, “I2C-bus specification and user manual”. Table 9. Alert response (Alert response address 0001 100) bit description Bit Symbol Description 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 Table 10. Fault detection D+ and D − ALERT output RET data storage Status set flag opened LOW 127 °C B2 and B4 shorted LOW 127 °CB4 |
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