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NE1617ADS Datasheet(PDF) 10 Page - NXP Semiconductors |
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NE1617ADS Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 27 page NE1617A_4 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 04 — 30 July 2009 10 of 27 NXP Semiconductors NE1617A Temperature monitor for microprocessor systems commands of registers named WIHL, WILL, WEHL, WELL, RIHL, RILL, REHL, RELL, accordingly. The POR default values are +127 °C (0111 1111) for the HIGH limit and −55 °C (1100 1001) for the LOW limit. 8.3.6 One-shot command The one-shot command is not actually a data register as such and a write operation to it will initiate an ADC conversion. The send byte format of the SMBus, as described later, with the use of OSHT command (0Fh), is used for this writing operation. In normal free-running-conversion operation mode of the device, a one-shot command immediately forces a new conversion cycle to begin. However, if a conversion is in progress when a one-shot command is received, the command is ignored. In software standby mode the one-shot command generates a single conversion and comparison cycle and then puts the device back in its standby mode after the conversion. In hardware standby mode, the one shot is inhibited. 8.3.7 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 8. 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 Section 8.3.8. 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. [1] These flags stay HIGH until the status register is read or POR is activated. [2] This flag stays HIGH until POR is activated. 8.3.8 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 typical) 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 Section 8.3.7 “Status register”, 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 Table 8. Status register bit assignment Bit Symbol POR state Function 7 (MSB) BUSY n/a HIGH when the ADC is busy converting 6 IHLF[1] 0 HIGH when the internal temperature high limit has tripped 5 ILLF[1] 0 HIGH when the internal temperature low limit has tripped 4 EHLF[1] 0 HIGH when the external temperature high limit has tripped 3 ELLF[1] 0 HIGH when the external temperature low limit has tripped 2 OPEN[2] 0 HIGH when the external diode is opened 1 to 0 - 0 reserved |
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