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ADM1032AR 数据表(PDF) 6 Page - Analog Devices |
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ADM1032AR 数据表(HTML) 6 Page - Analog Devices |
6 / 12 page REV. 0 ADM1032 –6– Status Register Bit 7 of the Status Register indicates that the ADC is busy con- verting when it is high. Bits 6 to 3, 1, and 0 are flags that indicate the results of the limit comparisons. Bit 2 is set when the remote sensor is open circuit. If the local and/or remote temperature measurement is above the corresponding high temperature limit, or below or equal to, the corresponding low temperature limit, one or more of these flags will be set. These five flags (Bits 6 to 2) NOR’d together, so that if any of them is high, the ALERT interrupt latch will be set and the ALERT output will go low. Reading the Status Register will clear the five flag bits, provided the error conditions that caused the flags to be set have gone away. While a limit comparator is tripped due to a value register containing an out-of-limit measure- ment, or the sensor is open circuit, the corresponding flag bit cannot be reset. A flag bit can only be reset if the corresponding value register contains an in-limit measurement or the sensor is good. The ALERT interrupt latch is not reset by reading the Status Register, but will be reset when the ALERT output has been serviced by the master reading the device address, provided the error condition has gone away and the Status Register flag bits have been reset. When Flags 1 and 0 are set, the THERM output goes low to indicate that the temperature measurements are outside the programmed limits. THERM output does not need to be reset, unlike the ALERT output. Once the measurements are within the limits, the corresponding Status register bits are reset and the THERM output goes high. Table IV. Status Register Bit Assignments Bit Name Function 7 BUSY 1 When ADC Converting 6 LHIGH * 1 When Local High-Temp Limit Tripped 5 LLOW * 1 When Local Low-Temp Limit Tripped 4 RHIGH * 1 When Remote High-Temp Limit Tripped 3 RLOW * 1 When Remote Low-Temp Limit Tripped 2 OPEN * 1 When Remote Sensor Open-Circuit 1 RTHRM 1 When Remote Therm Limit Tripped 0 LTHRM 1 When Local Therm Limit Tripped *These flags stay high until the status register is read or they are reset by POR. Configuration Register Two bits of the Configuration Register are used. If Bit 6 is 0, which is 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 SMBus. The ALERT and THERM O/Ps are also active in Standby Mode. Bit 7 of the configuration register is used to mask the alert output. If Bit 7 is 0, which is the power-on default, the output is enabled. If Bit 7 is set to 1, the output is disabled. Table II. Extended Temperature Resolution (Remote Temperature Low Byte) Extended Remote Temperature Resolution Low Byte 0.000 °C 0 000 0000 0.125 °C 0 010 0000 0.250 °C 0 100 0000 0.375 °C 0 110 0000 0.500 °C 1 000 0000 0.625 °C 1 010 0000 0.750 °C 1 100 0000 0.875 °C 1 110 0000 ADM1032 REGISTERS The ADM1032 contains registers that are used to store the results of remote and local temperature measurements, high and low temperature limits, and to configure and control the device. A description of these registers follows, and further details are given in Tables III to VII. Address Pointer Register The Address Pointer Register itself does not have, or require, an address, as it is the register to which the first data byte of every Write operation is written automatically. This data byte is an address pointer that sets up one of the other registers for the second byte of the Write operation, or for a subsequent read operation. The power-on default value of the Address Pointer Register is 00h, so if a read operation is performed immediately after power- on without first writing to the Address Pointer, the value of the local temperature will be returned, since its register address is 00h. Value Registers The ADM1032 has three registers to store the results of Local and Remote temperature measurements. These registers are written to by the ADC only and can be read over the SMBus. Offset Register Series resistance on the D+ and D– lines in processor packages and clock noise can introduce offset errors into the remote tem- perature measurement. To achieve the specified accuracy on this channel these offsets must be removed. The offset value is stored as an 11-bit, two’s complement value in registers 11h (high byte) and 12h (low byte, left justified). The value of the offset is negative if the MSB of register 11h is 1 and it is positive if the MSB of register 12h is 0. The value is added to the measured value of remote temperature. The offset register powers up with a default value of 0 °C, and will have no effect if nothing is written to them. Table III. Sample Offset Register Codes Offset Value 11h 12h –4 °C 1 111 1100 0 000 0000 –1 °C 1 111 1111 0 000 0000 –0.125 °C 1 111 1111 1 110 0000 0 °C 0 000 0000 0 000 0000 +0.125 °C 0 000 0000 0 010 0000 +1 °C 0 000 0001 0 000 0000 +4 °C 0 000 0100 0 000 0000 |
类似零件编号 - ADM1032AR |
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类似说明 - ADM1032AR |
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