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MAX34440 Datasheet(PDF) 14 Page - Maxim Integrated Products |
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MAX34440 Datasheet(HTML) 14 Page - Maxim Integrated Products |
14 / 43 page ![]() PMBus 6-Channel Power-Supply Manager 14 Table 1. PMBus Command Codes Detailed Description The MAX34440 is a highly integrated system monitor based upon a 16-bit MAXQM microcontroller with facto- ry-programmed functionality to monitor up to six power supplies. The device provides power-supply closed-loop control, and local/remote thermal-sensing facilities. The power-supply manager monitors the power-supply output voltage and constantly checks for user-pro- grammable overvoltage and undervoltage thresholds. It also can margin the power-supply output voltage up or down by a user-programmable level. The margining is performed in a closed-loop arrangement, whereby the device automatically adjusts a pulse-width-modulated (PWM) output and then measures the resultant output voltage. The power-supply manager can also sequence the supplies in any order at both power-up and power- down. With the addition of an external current-sense amplifier, the device can also monitor currents. Thermal monitoring can be accomplished using up to eight temperature sensors, including an on-chip ther- mal sensor, four DS75LV digital thermometers, and a MAX6695 dual remote/local thermal temperature sensor. Communication with the DS75LV and MAX6695 tem- perature sensors is conducted through a dedicated I2C/ SMBus interface. The device provides ALERT and FAULT output signals. Host communications are conducted through a PMBus- compatible communications port. Address input con- nections are also provided to allow up to four MAX34440 devices to reside on the system’s I/O bus. MAXQ is a registered trademark of Maxim Integrated Products, Inc. CODE COMMAND NAME TYPE PAGE 0–5 PAGE 6–13 PAGE 255 NO. OF BYTES FLASH STORED (NOTE 2) DEFAULT VALUE (NOTE 2) (NOTE 1) 00h PAGE R/W Byte R/W R/W R/W 1 N 00h 01h OPERATION R/W Byte R/W — W 1 N 00h 02h ON_OFF_CONFIG R/W Byte R/W R/W R/W 1 Y 1Ah 03h CLEAR_FAULTS Send Byte W W W 0 N — 10h WRITE_PROTECT R/W Byte R/W R/W R/W 1 N 00h 11h STORE_DEFAULT_ALL Send Byte W W W 0 N — 12h RESTORE_DEFAULT_ALL Send Byte W W W 0 N — 19h CAPABILITY Read Byte R R R 1 N 00h/10h 20h VOUT_MODE Read Byte R R R 1 FIXED 40h 25h VOUT_MARGIN_HIGH R/W Word R/W — — 2 Y 0000h 26h VOUT_MARGIN_LOW R/W Word R/W — — 2 Y 0000h 2Ah VOUT_SCALE_MONITOR R/W Word R/W — — 2 Y 7FFFh 38h IOUT_CAL_GAIN R/W Word R/W — — 2 Y 0000h 40h VOUT_OV_FAULT_LIMIT R/W Word R/W — — 2 Y 7FFFh 42h VOUT_OV_WARN_LIMIT R/W Word R/W — — 2 Y 7FFFh 43h VOUT_UV_WARN_LIMIT R/W Word R/W — — 2 Y 0000h 44h VOUT_UV_FAULT_LIMIT R/W Word R/W — — 2 Y 0000h 46h IOUT_OC_WARN_LIMIT R/W Word R/W — — 2 Y 7FFFh 4Ah IOUT_OC_FAULT_LIMIT R/W Word R/W — — 2 Y 0000h 4Fh OT_FAULT_LIMIT R/W Word — R/W — 2 Y 7FFFh 51h OT_WARN_LIMIT R/W Word — R/W — 2 Y 7FFFh 5Eh POWER_GOOD_ON R/W Word R/W — — 2 Y 0000h 5Fh POWER_GOOD_OFF R/W Word R/W — — 2 Y 0000h |
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