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NE1617ADS Datasheet(PDF) 8 Page - NXP Semiconductors |
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NE1617ADS Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 27 page NE1617A_4 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 04 — 30 July 2009 8 of 27 NXP Semiconductors NE1617A Temperature monitor for microprocessor systems 8.3.1 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. 8.3.2 Configuration register The configuration register is used to mask the Alert interrupt and/or to put the device in software standby mode. Only two bits of this register (bit 6 and bit 7) are used as listed in Table 5. Bit 7 is used to mask the device ALERT output from Alert interruption when this bit is set to logic 1, and bit 6 is used to activate the standby software mode when this bit is set to logic 1. This register can be written or read using the commands of registers named WC and RC accordingly. Upon Power-On Reset (POR), both bits are reset to zero. 8.3.3 External and internal temperature registers Results of temperature measurements after every ADC conversion are stored in two registers: Internal Temp register (RIT) for internal or local diode temperature, and External Temp register (RET) for external or remote diode temperature. These registers can be only read over the SMBus. The reading temperature data is in 2's complement binary form consisting of 7-bit data and 1-bit sign (MSB), with each data count represents 1 °C, and the MSB bit is transmitted first over the serial bus. The contents of those two registers are updated upon completion of each ADC conversion. Table 6 shows some values of the temperature and data. Table 5. Configuration register bit assignments Bit Symbol POR state Function 7 (MSB) MASK 0 Mask ALERT interrupt. Interrupt is enabled when this bit is LOW, and disabled when this bit is HIGH. 6 RUN/STOP 0 Standby or run mode control. When LOW, running mode is enabled; when HIGH, standby mode is initiated. 5 to 0 - n/a reserved |
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