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ADT7461ARZ-REEL Arkusz danych(PDF) 9 Page - ON Semiconductor |
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ADT7461ARZ-REEL Arkusz danych(HTML) 9 Page - ON Semiconductor |
9 / 20 page ADT7461 http://onsemi.com 9 Table 2. Temperature Data Format (Local and Remote 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 also 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 are not changed. The user must ensure that the limit registers are reprogrammed, as necessary, when the data format changes. See the Limit Registers section for more information. ADT7461 Registers The ADT7461 contains a total of 22 8-bit registers. These registers are used to store the results of remote and local temperature measurements and high and low temperature limits and to configure and control the device. A description of these registers follows. Additional details are provided in Table 3 to Table 7. Address Pointer Register The address pointer register does not have or require an address, as 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 ADT7461, which is stored in the address pointer register. This register address is written to by the second byte of a write operation or is used for a subsequent read operation. 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, since its register address is 0x00. Temperature Value Registers The ADT7461 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 SMBus. 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. Bits 0, 1, 3, and 4 are reserved and should not be written to by the user. Bit 7 of the configuration register is used to mask the ALERT output. If Bit 7 is 0, the ALERT output is enabled. This is the power-on default. If Bit 7 is set to 1, the ALERT output is disabled. This only applies if Pin 6 is configured as ALERT. If Pin 6 is configured as THERM2, the value of Bit 7 has no effect. If Bit 6 is set to 0 (the power-on default), the device is in operating mode with the ADC converting. If Bit 6 is set to 1, the device is in standby mode and the ADC does not convert. The SMBus does, however, remain active in standby mode, so values can be read from or written to the ADT7461 via the SMBus in this mode. The ALERT and THERM outputs are also active in standby mode. Changes made to the registers 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 ADT7461. If Bit 5 is 0 (default), then Pin 6 is configured as an 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), the temperature measurement range is set between 0 °C to +127°C. Setting Bit 2 to 1 means that the measurement range is set to the extended temperature range. Table 3. 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 Conversion Rate Register The conversion rate register is Address 0x04 at read and Address 0x0A at write. The lowest four bits of this register are used to program the conversion rate by dividing the |
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