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NCT218FCT2G Datasheet(PDF) 7 Page - ON Semiconductor |
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NCT218FCT2G Datasheet(HTML) 7 Page - ON Semiconductor |
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7 / 19 page  NCT218 http://onsemi.com 7 Table 6. TEMPERATURE DATA FORMAT (Temperature High Byte) Temperature Binary Offset Binary (Note 1) -55 °C 0 000 0000 (Note 2) 0 000 1001 0 °C 0 000 0000 0 100 0000 +1 °C 0 000 0001 0 100 0001 +10 °C 0 000 1010 0 100 1010 +25 °C 0 001 1001 0 101 1001 +50 °C 0 011 0010 0 111 0010 +75 °C 0 100 1011 1 000 1011 +100 °C 0 110 0100 1 010 0100 +125 °C 0 111 1101 1 011 1101 +127 °C 0 111 1111 1 011 1111 +150 °C 0 111 1111 (Note 3) 1 101 0110 1. Offset binary scale temperature values are offset by 64 °C. 2. Binary scale temperature measurement returns 0 °C for all temperatures < 0 °C. 3. Binary scale temperature measurement returns 127 °C for all temperatures > 127 °C. The user can switch between measurement ranges at any time. Switching the range likewise switches the data format. The next temperature result following the switching is reported back to the register in the new format. However, the contents of the limit registers do not change. It is up to the user to ensure that when the data format changes, the limit registers are reprogrammed as necessary. More information on this is found in the Limit Registers section. NCT218 Registers The NCT218 contains 22, 8−bit registers in total. These registers store the results of remote and local temperature measurements, high and low temperature limits, and configure and control the device. See the Address Pointer Register section through the Consecutive ALERT Register section of this data sheet for more information on the NCT218 registers. Additional details are shown in Table 7 through Table 11. The entire register map is available in Table 12. Address Pointer Register The address pointer register itself does not have, nor does it require, an address because the first byte of every write operation is automatically written to this register. The data in this first byte always contains the address of another register on the NCT218 that is stored in the address pointer register. It is to this register address that the second byte of a write operation is written, or to which a subsequent read operation is performed. The power−on default value of the address pointer register is 0x00. Therefore, if a read operation is performed immediately after power−on, without first writing to the address pointer, the value of the local temperature is returned because its register address is 0x00. Temperature Value Registers The NCT218 has three registers to store the results of local and remote temperature measurements. These registers can only be written to by the ADC and can be read by the user over the I2C. The local temperature value register is at Address 0x00. The external temperature value high byte register is at Address 0x01, with the low byte register at Address 0x10. The power−on default for all three registers is 0x00. Configuration Register The configuration register is Address 0x03 at read and Address 0x09 at write. Its power−on default is 0x00. Only four bits of the configuration register are used. Bit 0, Bit 1, Bit 3, and Bit 4 are reserved; only zeros should be written to these. Bit 7 of the configuration register masks the ALERT output. If Bit 7 is 0, the ALERT output is enabled. This is the power−on default. It Bit 7 is set to 1, the ALERT output is disabled. This applies only if Pin 6 is configured as ALERT. If Pin 6 is configured as THERM2, then the value of Bit 7 has no effect. If Bit 6 is set to 0, which is power−on default, the device is in operating mode with ADC converting. If Bit 6 is set to 1, the device is in standby mode and the ADC does not convert. The I2C does, however, remain active in standby mode; therefore, values can be read from or written to the NCT218 via the I2C. The ALERT and THERM output are also active in standby mode. Changes made to the register in standby mode that affect the THERM or ALERT outputs cause these signals to be updated. Bit 5 determines the configuration of Pin 6 on the NCT218. If Bit 5 is 0 (default), then Pin 6 is configured as a ALERT output. If Bit 5 is 1, then Pin 6 is configured as a THERM2 output. Bit 7, the ALERT mask bit, is only active when Pin 6 is configured as an ALERT output. If Pin 6 is set up as a THERM2 output, then Bit 7 has no effect. Bit 2 sets the temperature measurement range. If Bit 2 is 0 (default value), the temperature measurement range is set between 0 °C to +127°C. Setting Bit 2 to 1 sets the measurement range to the extended temperature range (−64 °C to +191°C). Table 7. CONFIGURATION REGISTER BIT ASSIGNMENTS Bit Name Function Power−On Default 7 MASK1 0 = ALERT Enabled 1 = ALERT Masked 0 6 RUN/STOP 0 = Run 1 = Standby 0 5 ALERT/ THERM2 0 = ALERT 1 = THERM2 0 4, 3 Reserved 0 2 Temperature Range Select 0 = 0 °C to 127°C 1 = Extended Range 0 1, 0 Reserved 0 |
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