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ADP1055ACPZ-R7 Folha de dados(PDF) 44 Page - Analog Devices |
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ADP1055ACPZ-R7 Folha de dados(HTML) 44 Page - Analog Devices |
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44 / 140 page  ADP1055 Data Sheet Rev. A | Page 44 of 140 Table 10. Contents of Black Box Records Byte Register Address Register Name Header Block 1 Rec_No[7:0] 2 Rec_No[15:8] 3 Rec_No[23:16] 4 0xFE95 FIRST_FAULT_ID[7:0] Data Block 5 0x78 STATUS_WORD[7:0] (same as STATUS_BYTE[7:0]) 6 0x79 STATUS_WORD[15:8] 7 0x7A STATUS_VOUT 8 0x7B STATUS_IOUT 9 0x7C STATUS_INPUT 10 0x7D STATUS_TEMPERATURE 11 0x7E STATUS_CML 12 0x7F STATUS_OTHER 13 0x80 STATUS_MFR_SPECIFIC 14 0xFE94 STATUS_UNKNOWN[7:0] 15 0xFE94 STATUS_UNKNOWN[15:8] 16 0x88 READ_VIN[7:0] 17 0x88 READ_VIN[15:8] 18 0x89 READ_IIN[7:0] 19 0x89 READ_IIN[15:8] 20 0x8B READ_VOUT[7:0] 21 0x8B READ_VOUT[15:8] 22 0x8C READ_IOUT[7:0] 23 0x8C READ_IOUT[15:8] 24 0x8D Reserved[7:0] 25 0x8D Reserved[15:8] 26 0x8E READ_TEMPERATURE_2[7:0] 27 0x8E READ_TEMPERATURE_2[15:8] 28 0x8F READ_TEMPERATURE_3[7:0] 29 0x8F READ_TEMPERATURE_3[15:8] 30 0x94 READ_DUTY_CYCLE[7:0] 31 0x94 READ_DUTY_CYCLE[15:8] 32 0x95 READ_FREQUENCY[7:0] 33 0x95 READ_FREQUENCY[15:8] 34 0x96 READ_POUT[7:0] 35 0x96 READ_POUT[15:8] PEC Block 36 PEC[7:0] Undefined Block 37 … 64 BLACK BOX TIMING Two EEPROM pages (Page 2 and Page 3) are used to store the black box data; each page contains eight records. Due to the page erase requirement of the EEPROM, when the black box has completed writing the last record to either page (Rec_No = 8n − 1; n > 0, that is, 7, 15, 23, 31, and so on), a page erase operation is automatically initiated on the other page. The erase operation takes an additional 32 ms to complete. During the erase operation, any PMBus transaction to the device receives a no acknowledge (NACK), and the busy bit (Bit 7) of STATUS_BYTE is set accordingly. At the end of the erase operation, the device resumes normal operation. The minimum time required to program a complete black box record is calculated as follows: TPROG_BBOX (MIN) = (num_of_bytes + 1) × TPROG where: TPROG = 30.72 μs. num_of_bytes = 36 (36 bytes in each black box record). If the erase operation is part of the sequence of saving data to the black box, the additional erase time is added to TPROG_BBOX (MIN), as follows: TPROG_BBOX (MIN) = ~1.2 ms TERASE = ~32 ms TPROG_BBOX (MAX) = ~33.2 ms When black box writing is enabled with the option to record retry attempts (Register 0xFE48[1:0] = 10 or 11), data can be saved between every unsuccessful attempt to restart the device. It is recommended that the minimum retry time be set to a value greater than 1.2 ms. If the retry time is insufficient for black box recording, the device prolongs the retry time so that the recording can finish before attempting to restart the power supply. This delay may result in inconsistent retry times between successive restart attempts. The retry time is programmed using the PMBus commands xxx_FAULT_RESPONSE, where xxx refers to the various configurable faults for that device. At every eighth recording, the TERASE time is added to the TPROG_BBOX (MIN) time, resulting in the TPROG_BBOX (MAX) time. If the retry time is less than the maximum time, the device again delays the restart attempt to wait for the completion of the black box recording and the successive page erase. Black box operation is a direct result of a fault condition that triggers a power supply shutdown. To ensure that the black box is written to in the event of a brownout condition, a holdup capacitor on the VDD pin is recommended to ensure that all the information is written to the black box before the ADP1055 reaches the UVLO threshold. (Instead of a holdup capacitor, an equivalent capacitor from the rail where 3.3 V is derived can be used to maintain the VDD voltage above UVLO.) The capacitor must be large enough to maintain power to the system over a time that exceeds TPROG_BBOX (MIN) which is approximately 10 μF on a 10 V rail until VDD falls below UVLO. |
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