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ADT7483A Datasheet(PDF) 13 Page - Analog Devices |
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ADT7483A Datasheet(HTML) 13 Page - Analog Devices |
13 / 24 page ADT7483A Rev. 0 | Page 13 of 24 Table 10. Conversion Rate/Channel Selector Register Bit Mnemonic Function 7 Averaging Setting this bit to 1 disables averaging of the temperature measurements at the slower conversion rates (averaging cannot take place at the three faster rates, hence, setting this bit has no effect). Default = 0 = averaging enabled. 6 Reserved Reserved for future use. Do not write to this bit. <5:4> Channel Selector These bits are used to select the temperature measurement channels. 00 = round robin = default = all channels. 01 = local temperature. 10 = Remote 1 temperature. 11 = Remote 2 temperature. <3:0> Conversion Rates These bits set how often the ADT7483A measures each temperature channel. Conversions/second Time (seconds) 0000 = 0.0625 16 0001 = 0.125 8 0010 = 0.25 4 0011 = 0.5 2 0100 = 1 1 0101 = 2 500 m 0110 = 4 250 m 0111 = 8 = default 125 m 1000 = 16 62.5 m 1001 = 32 31.25 m 1010 = continuous measurements Limit Registers The ADT7483A has three limits for each temperature channel: high, low, and THERM temperature limits for local, Remote 1, and Remote 2 temperature measurements. The remote temperature high and low limits span two registers each to contain an upper and lower byte for each limit. There is also a THERM hysteresis register. All limit registers can be written to and read back over the SMBus. See Table 8 for details of the limit registers’ addresses and their power-on default values. When Pin 13 is configured as an ALERT output, the high limit registers perform a > comparison while the low limit registers perform a ≤ comparison. For example, if the high limit register is programmed with 80°C, then measuring 81°C will result in an out-of-limit condition, setting a flag in the status register. If the low limit register is programmed with 0°C, measuring 0°C or lower will result in an out-of-limit condition. Exceeding either the local or remote THERM limit asserts THERM low. When Pin 13 is configured as THERM2, exceeding either the local limit or remote high limit asserts THERM2 low. A default hysteresis value of 10°C is provided that applies to both THERM channels. This hysteresis value may be reprogrammed to any value after power-up using Register Address 0x21. It is important to remember that the data format for temperature limits is the same as the temperature measurement data format. Thus, if the temperature measurement uses the default (binary), then the temperature limits also use the binary scale. If the temperature measurement scale is switched, however, the temperature limits do not automatically switch. The user must reprogram the limit registers to the desired value in the correct data format. For example, if the remote low limit is set at 10°C and the default binary scale is being used, the limit register value should be 0000 1010b. If the scale is switched to offset binary, the value in the low temperature limit register should be reprogrammed to be 0100 1010b. |
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