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ADT7482ARMZ-REEL Datasheet(PDF) 10 Page - ON Semiconductor |
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ADT7482ARMZ-REEL Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 20 page ADT7482 http://onsemi.com 10 Table 5. Configuration 2 Register (Address 0x24) Bit Mnemonic Function 7 Lock Bit Setting this bit to 1 locks all lockable registers to their current values. This prevents tampering with settings until the device is powered down. Default = 0. <6:0> Res Reserved for future use. Conversion Rate Register The conversion rate register is at Address 0x04 for reads and Address 0x0A for writes. The four LSBs of this register are used to program the conversion times from 15.5 ms (Code 0x0A) to 16 seconds (Code 0x00). To program the ADT7482 to perform continuous measurements, set the conversion rate register to 0x0B. For example, a conversion rate of 8 conversions/second means that, beginning at 125 ms intervals, the device performs a conversion on the local and the remote temperature channels. The four MSBs of this register are reserved and should not be written to. This register can be written to and read back over the SMBus. The default value of this register is 0x07, giving a rate of 8 conversions per second. Use of slower conversion times greatly reduces the device power consumption. Limit Registers The ADT7482 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 11 for limit register addresses and power−on default values. When Pin 8 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 results 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 results in an out−of−limit condition. Exceeding either the local or remote THERM limit asserts THERM low. When Pin 8 is configured as THERM2, exceeding either the local 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 can be reprogrammed. It is important to remember that the temperature limits data format is the same as the temperature measurement data format. If the temperature measurement uses the default binary scale, then the temperature limits also use the binary scale. If the temperature measurement scale is switched, however, the temperature limits do not switch automatically. The limit registers must be reprogrammed 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 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. Table 6. Conversion Rate/Channel Selector Register (Read Address 0x04, Write Address 0x0A) Bit Mnemonic Function 7 Reserved Reserved for future use. Do not write to this bit. 6 Reserved Reserved for future use. Do not write to this bit. 5 Reserved Reserved for future use. Do not write to this bit. 4 Reserved Reserved for future use. Do not write to this bit. <3:0> Conversion Rates These bits set how often the ADT7482 measures each temperature channel. Conversions/sec Time (seconds) 0000 = 0.0625 0001 = 0.125 0010 = 0.25 0011 = 0.5 0100 = 1 0101 = 2 0110 = 4 0111 = 8 = default 1000 = 16 1001 = 32 1010 = 64 16 8 4 2 1 500 m 250 m 125 m 62.5 m 31.25 m 15.5 m |
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