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MAX34446
PMBus Power-Supply Data Logger
OT_WARN_LIMIT (51h)
The OT_WARN_LIMIT command sets the temperature, in degrees Celsius, of the selected temperature sensor at which
an overtemperature warning is detected. The monitored temperature must drop by at least 4 N C below the limit before
the warning is allowed to clear. This warning is masked until the temperature is below this limit for the first time. The 2
data bytes are in DIRECT format. In response to the OT_WARN_LIMIT being exceeded, the device does the following:
1) Sets the TEMPERATURE bit in STATUS_BYTE.
2) Sets the TEMPERATURE and MFR bits in STATUS_WORD.
3) Sets the OT_WARN bit in STATUS_MFR_SPECIFIC register.
4) Responds as specified in the MFR_FAULT_RESPONSE.
POWER_GOOD_ON (5Eh)
The POWER_GOOD_ON command sets the value of the monitored voltage that causes the PG[3:0] outputs to assert.
The monitored voltage must be above the associated POWER_GOOD_ON threshold before the associated PGn output
is asserted and the POWER_GOOD# bit in the associated STATUS_MFR_SPECIFIC is cleared ( Figure 3 ). The assertion
of the PGn outputs can be delayed with the MFR_PG_DELAY command. All individual voltage channels must exceed
POWER_GOOD_ON before the POWER_GOOD# bit in the STATUS_WORD is cleared. The POWER_GOOD_ON level
is normally set higher than the POWER_GOOD_OFF level. The 2 data bytes are in DIRECT format. This command is
ignored if the channel is disabled or configured to monitor current.
POWER_GOOD_OFF (5Fh)
The POWER_GOOD_OFF command sets the value of the monitored voltage that causes the PG[3:0] outputs to deassert
after it has been asserted. A monitored voltage that falls below the associated POWER_GOOD_OFF threshold causes
the associated PGn output to be deasserted and the POWER_GOOD# bit in STATUS_WORD and the POWER_GOOD#
bit in the associated STATUS_MFR_SPECIFIC is set ( Figure 3 ). The POWER_GOOD_OFF level is normally set lower
than the POWER_GOOD_ON level. The 2 data bytes are in DIRECT format. This command is ignored if the channel is
disabled or configured to monitor current.
USER NOTE: The PGn outputs are forced high impedance if the channel is disabled or if the channel is config-
ured to measure current.
ADC INPUT
PGn OUTPUT
POWER_GOOD# BIT IN
STATUS_MFR_SPECIFIC
POWER_GOOD_ON
MFR_PG_DELAY
POWER_GOOD_OFF
SYNC OUTPUT
MFR_SYNC_CONFIG = 1428h
100kHz
200kHz
100kHz
Figure 3. Power Good, SYNC Output, and Status Bit Timing
Maxim Integrated
23
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MAX3444EASA+ 功能描述:RS-485接口IC 10Mbps Fail-Safe RS-485/J1708 Tcvr RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EASA+T 功能描述:RS-485接口IC 10Mbps Fail-Safe RS-485/J1708 Tcvr RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EASA-T 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EEPA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
MAX3444EESA 功能描述:RS-485接口IC RoHS:否 制造商:Texas Instruments 数据速率:250 Kbps 工作电源电压:3.3 V 电源电流:750 uA 工作温度范围:- 40 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
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