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NE1617ADS Fiches technique(PDF) 11 Page - NXP Semiconductors |
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NE1617ADS Fiches technique(HTML) 11 Page - NXP Semiconductors |
11 / 17 page Philips Semiconductors Product data sheet NE1617A Temperature monitor for microprocessor systems 2004 Oct 05 11 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 6 and 7 of this register are used as listed in Table 3. Bit 7 is used to mask the device ALERT output from Alert interruption when this bit is set to 1 and bit 6 is used to activate the standby software mode when this bit is set to to 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. Table 3. Configuration register bit assignments BIT NAME 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 RESERVED n/a n/a 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 4 shows some values of the temperature and data. Table 4. Temperature data format (2’s complement) TEMPERATURE ( °C) DIGITAL OUTPUT (8 BITS) +127 0 111 1111 +126 0 111 1110 +100 0 110 0100 +50 0 011 0010 +25 0 001 1001 +1 0 000 0001 0 0 000 0000 –1 1 111 1111 –25 1 110 0111 –50 1 100 1110 –65 1 011 1111 Conversion rate register The conversion rate register is used to store programmable conversion data, which defines the time interval between conversions in standard free-running auto-convert mode. The Table 5 shows all applicable data and rates for the device. Only three LSB bits of the register are used and other bits are reserved for future use. This register can be written to and read back over the SMBus using commands of the registers named WCR and RCR respectively. The POR default conversion data is 02h (0.25Hz). Notice that the average supply current, as well as the device power consumption, is increased with the conversion rate. Table 5. Conversion rate control byte DATA CONVERSION RATE (Hz) AVERAGE SUPPLY CURRENT ( µA Typ. @ VDD = 3.3 V) 00h 0.0625 TBD 01h 0.125 TBD 02h 0.25 TBD 03h 0.5 TBD 04h 1 TBD 05h 2 TBD 06h 4 TBD 07h 8 TBD 08h to FFh Reserved n/a Temperature limit registers The device has four registers to be used for storing programmable temperature limits, including the high limit and the low limit for each channel of the external and internal diodes. Data of the temperature register (RIT & RET) for each channel are compared with the contents of the temperature limit registers of the same channel, resulting in alarm conditions. If measured temperature either equals or exceeds the corresponding temperature limits, an Alert interrupt is asserted and the corresponding flag bit in the status register is set. The temperature limit registers can be written to and read back using 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. 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. |
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