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ADM1021 Fiches technique(PDF) 7 Page - Analog Devices |
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ADM1021 Fiches technique(HTML) 7 Page - Analog Devices |
7 / 12 page ADM1021 –7– REV. 0 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 ADM1021 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 that the ADC is busy con- verting when it is high. 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 corre- sponding 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 com- parator 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 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. 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. 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 ADM1021 Registers READ Address (Hex) WRITE Address (Hex) Name Power-On Default Not Applicable Not Applicable Address Pointer Undefined 00 Not Applicable Local Temp. Value 0000 0000 (00h) 01 Not Applicable Remote Temp. Value 0000 0000 (00h) 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 13 Reserved Undefined 2 12 14 Reserved Undefined 2 15 16 Reserved 1000 0000 2 17 18 Reserved Undefined 2 19 Not Applicable Reserved 0000 0000 2 20 21 Reserved Undefined FE Not Applicable Manufacturer Device ID 0100 0001 (41h) FF Not Applicable Die Revision Code Undefined NOTES 1Writing to address 0F causes the ADM1021 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. |
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