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ADM1021A Datasheet(PDF) 7 Page - Analog Devices |
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ADM1021A Datasheet(HTML) 7 Page - Analog Devices |
7 / 16 page ADM1021A –7– REV. D Table III. List of ADM1021A Registers READ Address (Hex) WRITE Address (Hex) Name Power-On Default Not Applicable Not Applicable Address Pointer Undefined 00 Not Applicable Local Temp. Value 1000 0000 (80h) (–128 °C) 01 Not Applicable Remote Temp. Value 1000 0000 (80h) (–128 °C) 02 Not Applicable Status Undefined 03 09 Configuration 0000 0000 (00h) 04 0A Conversion Rate 0000 0010 (02h) 05 0B Local Temp. High Limit 0111 1111 (7Fh) (+127 °C) 06 0C Local Temp. Low Limit 1100 1001 (C9h) (–55 °C) 07 0D Remote Temp. High Limit 0111 1111 (7Fh) (+127 °C) 08 0E Remote Temp. Low Limit 1100 1001 (C9h) (–55 °C) Not Applicable 0F 1 One-Shot 10 Not Applicable Reserved Undefined 2 11 11 Reserved Undefined 2 12 12 Reserved Undefined 2 13 13 Reserved Undefined 2 14 14 Reserved Undefined 2 15 16 Reserved Undefined 2 17 18 Reserved Undefined 2 19 Not Applicable Reserved Undefined 2 20 21 Reserved Undefined 2 FE Not Applicable Manufacturer Device ID 0100 0001 (41h) FF Not Applicable Die Revision Code 0011 xxxx (3xh) NOTES 1Writing to address 0F causes the ADM1021A to perform a single measurement. It is not a data register as such and it does not matter what data is written to it. 2These registers are reserved for future versions of the device. Table I. Temperature Data Format Temperature Digital Output 0 °C0 000 0000 1 °C0 000 0001 10 °C0 000 1010 25 °C0 001 1001 50 °C0 011 0010 75 °C0 100 1011 100 °C0 110 0100 125 °C0 111 1101 127 °C0 111 1111 REGISTERS The ADM1021A contains nine 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 II to IV. It should be noted that the ADM1021A’s registers are dual port, and have different addresses for read and write operations. Attempting to write to a read address, or to read from a write address, will produce an invalid result. Register addresses above 0Fh are reserved for future use or used for factory test purposes and should not be written to. Address Pointer Register The Address Pointer Register itself does not have, nor does it 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. Value Registers The ADM1021A has two registers to store the results of local and remote temperature measurements. These registers are written to by the ADC and can only be read over the SMBus. Status Register Bit 7 of the Status Register indicates when it is high that the ADC is busy converting. Bits 5 to 3 are flags that indicate the results of the limit comparisons. If the local and/or remote temperature measurement is above the corresponding high temperature limit or below the corresponding low temperature limit, then one or more of these flags will be set. Bit 2 is a flag that is set if the remote temperature sensor is open- circuit. These five flags are 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 measurement, or the sen- sor is open-circuit, the corresponding flag bit cannot be reset. A flag bit can only be reset if the corresponding value register con- tains an in-limit measurement, or the sensor is good. Table II. 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 1–0 Reserved *These flags stay high until the status register is read or they are reset by POR. |
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