Maxim-integrated MAX15303 PMBus Command Set Manuel d'utilisateur Page 24
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MAX15303 PMBus Command Set User’s Guide
Page 24 of 52
OT_WARN_LIMIT
temperature signal instead.
Overtemperature fault hysteresis is achieved in the MAX15303 by using the OT_WARN_LIMIT as the
“fault cleared” threshold for OT_FAULT_LIMIT
. For this reason, it is important to always set
OT_WARN_LIMIT below OT_FAULT_LIMIT.
VIN_OV_FAULT_LIMIT
Reference:
Standard Command
Lockable:
Yes
Command Code:
0x55
Format:
Linear
Data Bytes:
2
Units:
V
Transfer:
Read/Write Word
Factory Value:
0xD380 (14V)
Description/Notes:
See Section 15.23 of the PMBus Specification Part II.
The MAX15303 hardware has 8-bit resolution for the input overvoltage fault limit, to a maximum
value of ≈14.75V.
The desired value of VIN_OV_FAULT_LIMIT is retained in memory, regardless limitations imposed by
the 8-bit fault limit resolution, but the read-back value is based on actual hardware register settings.
VIN_OV_FAULT_RESPONSE
Reference:
Standard Command
Lockable:
Yes
Command Code:
0x56
Format:
Bit field
Data Bytes:
1
Units:
N/A
Transfer:
Read/Write Byte
Factory Value:
0xC0 (Shut down, restart when fault
abates)
Description/Notes:
See Sections 10.5.1 and 15.24 of the PMBus Specification Part II.
Note that the MAX15303 does not support finite, non-zero restart-attempt counts. (Continuous
restart attempts are supported.)
The VIN_OV_FAULT_RESPONSE command data comprises three bit-fields:
Bits [7:6] determine the basic fault-response mode. The MAX15303 supports the following modes:
00 Ignore the fault condition.
01 Continue operating and wait for the fault to abate for time specified in bits [2:0]. If the
fault does not abate, shutdown and attempt to restart according to bits [5:3].
10 Stop regulating immediately, delay for the time specified in bits [2:0], then attempt to
restart according to bits [5:3].
11 Stop regulating immediately, and then restart as soon as possible after the fault
condition abates. (Default setting)
Bits [5:3] determine the number of retry attempts. The MAX15303 supports only a subset of the full
PMBus functionality for this portion of the command:
000-110 No attempt is made to restart after a fault shutdown. (Default setting)
111 Attempt to restart continuously until commanded off, or until another fault
condition causes the unit to shut down.
- MAX15303 PMBus Command Set 1
- User’s Guide 1
- Introduction 2
- Table of Contents 2
- OPERATION 6
- ON_OFF_CONFIG 6
- VIN_OFF 7
- VOUT_MODE 9
- VOUT_COMMAND 9
- VOUT_TRIM 10
- VOUT_CAL_OFFSET 10
- VOUT_MAX 10
- VOUT_MARGIN_HIGH 11
- VOUT_MARGIN_LOW 11
- VOUT_TRANSITION_RATE 12
- VOUT_DROOP 12
- FREQUENCY_SWITCH 14
- INTERLEAVE 14
- POWER_GOOD_ON 16
- POWER_GOOD_OFF 16
- TON_DELAY 17
- TON_RISE 17
- TOFF_DELAY 17
- TOFF_FALL 18
- Fault-Related Commands 19
- VOUT_OV_FAULT_RESPONSE 20
- VOUT_UV_FAULT_LIMIT 20
- VOUT_UV_FAULT_RESPONSE 20
- IOUT_OC_FAULT_LIMIT 21
- IOUT_OC_FAULT_RESPONSE 21
- OT_FAULT_LIMIT 22
- OT_FAULT_RESPONSE 23
- OT_WARN_LIMIT 23
- VIN_OV_FAULT_LIMIT 24
- VIN_OV_FAULT_RESPONSE 24
- VIN_UV_FAULT_LIMIT 25
- VIN_UV_FAULT_RESPONSE 25
- Unit Status Commands 27
- STATUS_INPUT 28
- STATUS_TEMPERATURE 28
- STATUS_CML 28
- Telemetry Commands 29
- READ_TEMPERATURE_1 30
- READ_TEMPERATURE_2 30
- READ_DUTY_CYCLE 30
- READ_FREQUENCY 30
- PMB_VALUES 31
- Calibration Commands 33
- EXT_TEMP_CAL 34
- CAPABILITY 35
- PMBUS_REVISION 35
- MFR_MODEL 36
- MFR_REVISION 36
- MFR_LOCATION 36
- MFR_DATE 36
- MFR_SERIAL 37
- IC_DEVICE_ID 37
- IC_DEVICE_REV 37
- Security Commands 38
- MANUF_LOCK 39
- MANUF_PASSWD 39
- USER_CONF 39
- USER_LOCK 40
- USER_PASSWD 40
- SECURITY_LEVEL 41
- Memory and Storage Commands 42
- RESTORE_DEFAULT_ALL 43
- STORE_USER_ALL 43
- RESTORE_USER_ALL 44
- RESTORE_MAXIM_ALL 45
- STRAP_DISABLE 45
- Control Loop Commands 47
- FEEDBACK_EFFORT 48
- LOOP_CONFIG 48
- COMP_MODEL 49
- DEADTIME_GCTRL 49
- Trademarks 51
- Revision History 52
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