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ADM1023ARQ Datasheet(PDF) 8 Page - Analog Devices |
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ADM1023ARQ Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page ADM1023 –8– REV. A Table IV. Remote Remote Temperature Temperature Offset Registers Offset (Including (Without 11h 12h Value Offset) Offset) 1111 1100 0000 0000 –4 °C14°C18°C 1111 1111 0000 0000 –1 °C17°C18°C 1111 1111 1110 0000 –0.125 °C 17.875°C18°C 0000 0000 0000 0000 0 °C18°C18°C 0000 0000 0010 0000 +0.125 °C 18.125°C18°C 0000 0001 0000 0000 +1 °C19°C18°C 0000 0100 0000 0000 +4 °C22°C18°C Status Register Bit 7 of the Status Register indicates that the ADC is busy con- verting when it is high. Bits 6 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 corre- sponding low temperature limit, 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 are 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 sensor is open-circuit, the corresponding flag bit cannot be reset. A flag bit can only be reset if the corre- sponding 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. Table V. 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. 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. Standby mode can also be selected by taking the STBY pin low. In standby mode the values of remote and local temperature remain at the value they were before the part was placed in standby. 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 ALERT output is enabled. If Bit 7 is set to 1, the ALERT output is disabled. Table III. List of ADM1023 Registers READ Address (Hex) WRITE Address (Hex) Name Power-On Default Not Applicable Not Applicable Address Pointer Undefined 00 Not Applicable Local Temperature Value 1000 0000 (80h) (–128 °C) 01 Not Applicable Remote Temperature Value High Byte 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 Temperature High Limit 0111 1111 (7Fh) (+127 °C) 06 0C Local Temperature Low Limit 1100 1001 (C9h) (–55 °C) 07 0D Remote Temperature High Limit High Byte 0111 1111 (7Fh) (+127 °C) 08 0E Remote Temperature Low Limit High Byte 1100 1001 (C9h) (–55 °C) Not Applicable 0F 1 One-Shot 10 Not Applicable Remote Temperature Value Low Byte 0000 0000 11 11 Remote Temperature Offset High Byte 0000 0000 12 12 Remote Temperature Offset Low Byte 0000 0000 13 13 Remote Temperature High Limit Low Byte 0000 0000 14 14 Remote Temperature Low Limit Low Byte 0000 0000 19 Not Applicable Reserved 0000 0000 20 21 Reserved Undefined FE Not Applicable Manufacturer Device ID 0100 0001 (41h) FF Not Applicable Die Revision Code 0011 xxxx (3xh) NOTE 1Writing to address 0F causes the ADM1023 to perform a single measurement. It is not a data register as such and it does not matter what data is written to it. |
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